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Chaetomium species for plant disease control are reported to be antagonize many plant pathogens. It is a new broad spectrum biological fungicide from Chaetomium species which firstly discovered and patented No. 6266, International Code: AO 1 N 25/12, and registered as Ketomium® mycofungicide for plant disease control in Thailand, Laos, Vietnam, Cambodia and China. Chaetoimum biofungicide and biostimulants are applied to implement integrated plant disease control. It showed protective and curative effects in controlling plant disease and promoting plant growth. It has been successfully applied to the infested soils with integrated cultural control for the long-term protection against rice blast (Magnaporte oryzae), durian and black Pepper rot (Piper nigram L.) (Phytophthora palmivora), citrus rot (Phytophthora parasitica) and strawberry rot (Fragaria spp.) caused by Phytophthora cactorum, wilt of tomato (Fusarium oxysporum f. sp. lycopersici), basal rot of corn (Sclerotium rolfsii) and anthracnose (Colletotrichum spp.) etc. Further research is reported on the other bioactive compounds from active strains of Chaetomium spp. We have discovered various new compounds from Ch. globosum, Ch. cupreum, Ch. elatum, Ch. cochliodes, Ch. brasiliense, Ch. lucknowense, Ch. longirostre and Ch. siamense. These new compounds are not only inhibiting human pathogens (anti-malaria, anti-tuberculosis, anti-cancer cell lines and anti-C. albicans etc) but also plant pathogens as well. These active natural products from different strains of Chaetomium spp. are further developed to be biodegradable nanoparticles from active metabolites as a new discovery of scientific investigation which used to induce plant immunity, namely microbial degradable nano-elicitors for inducing immunity through phytoalexin production in plants e.g. inducing tomato to produce alpha-tomaline against Fusarium wilt of tomato, capsidiol against chili anthracnose, sakuranitin and oryzalexin B against rice blast, scopletin and anthrocyaidin against Phytophthora or Pythium rot Durian and scoparone against Phytophthora or Pythium rot of citrus. Chaetomium biofungicide can be applied instead of toxic chemical fungicides to control plant diseases.
chapter and author info
Faculty of Agricultural Technology, Department of Plant Production Technology, King Mongkut’s Institute of Technology Ladkrabang, Thailand
Faculty of Science, Natural Products Research Unit, Department of Chemistry and Centre of Excellence for Innovation in Chemistry, Khon Kaen University, Thailand
Faculty of Agricultural Technology, Department of Plant Production Technology, King Mongkut’s Institute of Technology Ladkrabang, Thailand
Faculty of Agricultural Technology, Department of Plant Production Technology, King Mongkut’s Institute of Technology Ladkrabang, Thailand
ChaetomiumKunze belongs to Ascomycota of the Chaetomiaceaewhich established by Kunze in  and it is one of the largest genera of saprophytic ascomycetes which comprise more than 300 species worldwide [2, 3, 4, 5, 6]. Chaetomiumis recorded to be a potent antagonists of various plant pathogens, especially soil-borne and seed borne pathogens [4, 7, 8, 9]. Chaetomiumis also reported to be antagonistic to the growth of bacteria and fungi through competition for nutrients, mycoparasitism, antibiosis, or various combinations . The application of Chaetomiumas a antagonist to control plant pathogens was first reported in 1954 by Tveit and Moore who found Ch. globosumand Ch. cochliodesgrown on surface of oat seeds provided to control Helminthosporium victoriae. Chaetomium globosumand Ch. cochlioidesnoted to inhibit the growth of Fusariumspp. and Helminthosporiumspp. . The living spore of Ch. globosumsignificantly controlled the apple scab (Venturia inequalis). Ch. globosumproduces metabolites inhibiting the growth of P. ultimumcausing damping-off of sugar beet , Rhizoctonia solani, leafblight of brassicas causing Alternaria brassicicola and can reduce the pathogenic inoculum of Botrytis cinereacausing deadly lily leaves in the field . Chaetomium cupreumis reported to control soybean plant pathogens e.g. Phomopsisand Colletotrichumspp. . It is reported that isolate of Ch. globosumproduce antibiotic substances that suppressed the damping – off of sugar beet cause by P. ultimum. Chaetomium globosumis noted to be a strong cellulose decomposer  and showed an effective antagonist of various soil microorganisms [7, 8]. Moreover, Chaetomiumspp. are recorded to produce their active metabolites for biological activities. Several types of pure compounds are found from Chaetomiumspecies e.g. benzoquinone derivatives .
In Thailand, Chaetomiumspp. were studied and screened for abilities as antagonistic effect againist phytopathogens in 1989 by Soytong et al. . Chaetomium cupreumand Ch. globosumwere reported to decrease leaf spot disease of corn caused by Curvularia lunata, rice blast caused by Pyricularia oryzaeand sheath blight of rice caused by Rhizoctonia oryzae[21, 22]. Chaetomiumspp. are also strongly recommended in competitive and high ability to make organic compost and to suppress pathogen in the soil. Chaetomiumspp. are known to be the strictly saprophytic coprophilousn. It can be found in organic materials, plant debris and high organic soil . Some species produce cellulase to decompose cellulose, lignin and other organic materials and serve as a biological control agent against several phytopathogens .
Chaetomium cupreumand Ch. globosumare noted to decrease leaf spot of corn (Curvularia lunata), rice blast (Pyricularia oryzae), sheath blight (Rhizoctonia oryzae) and tomato wilt (Fusarium oxysporumf.sp. lycopersici) [22, 24]. Chetomanone, ergosterol, ergosteryl palmitate, chrysophanol, chaetoglobosin C, alternariol monomethyl ether, echinuline and isochaetoglobosin D were produced from Ch. globosumKMITL-N0802  which implies antibiosis. Chaetomium cupreumwas significantly reduced the growth of seed-borne pathogen of rice e.g. Curvularia lunata, Drechslera oryzae, Fusarium moniliformeand Pyricularia oryzae. Chaetomium globosumwas exprsssed significantly suppression to tomato wilt caused by Fusarium oxysporumf. sp. lycopersiciand Pseudomonas solanacearum in Thailand[23, 27] while Ch. cupreumreported to give a good control tomato wilt in the fields . The specific effective strains of Chaetomiumspp. have been formulated as biological products in the forms of pellet and powder  that could effectively control many soil borne plant pathogens. The Chaetomiumbioproducts were reported to have a good potential in control of ThielaviopsisBud Rot of Bottle palm caused by Hyophorbe lagenicaulisin the fields . Chaetomium globosumand Ch. cupreumare successfully applied to control root rot disease of citrus, black pepper, strawberry and reduce damping off disease of sugar beet [20, 31]. The powder and pelletized formulations of Ketomium®, as a broad spectrum biofungicides has been registered as a biological biofertilizer for degrading organic matter and to induce plant immunity and stimulate plant growth . It was recorded that Ketomium® mycofungicide from Thailand was the most efficient to control raspberry spur blight (Didymella applanate) and reduced potato disease (Rhizoctonia solani) and increasing potato yield . After 2 years in storage, Ketomium® biofungicide from Thailand was still capable to inhibit the growth of plant pathogens in higher doses .
The biofungicide produced from Ch. globosumand Ch. cupremresulted in controlling Phytophthoraroot rot of durian (Phytophthora palmivora) in the fields which the Phytophthorapathogen reduced after applying Chaetomiuminto soils planted Durian var. Monthong in Thailand . Chaetomiumbiofungicide is also reported to control Phytophthora parasiticain fields planted to Citrus in the most serious disease area in Thailand . Soytong et al.  stated that Ketomium® was applied to Fusarium-infested soils where tomatoes were grown and it had sucessfully controlled the pathogen inoculum and reduced disease prevalance. Ketomium® have been successfully controlled as Fusarium-suppressive soils. The tomato plants treated with Ketomium® and pentachloronitrobenzen (PCNB) completely controlled F. oxysporumf. sp. lycopersici(tomato wilt). P. palmivora(black pepper rot). It is penciled that the tested Ketomium® biological product has been proved to control several diseases in the fields to control root rot of durian , black paper  and citrus . Further research has done to formulate those active antagonistic Chaetomiumspecies to be biological fungicide to control plant diseases e.g. late blight of potato, citrus rot disease, white rot disease of para rubber. It is also reported that the specific strains of Ch. globosumcan be inhibited root knot nematode and insect control.
2. Biological control of potato late blight using Chaetomiumbiofungicide
Application of Chaetomium-biofungicide is sucessfully controlled late blight late blight of potato caused by Phytophthora infestansin northern Thailand. Before experiment, It was found that P. infestansspread directly to the potato plants in the field through zoosporangia and resulted in a serious diseaase and lost of yield. It was investigated that P. infestansfound in the soil planted with potato in high pathogen inocula before experiment (Figure 1). Ketomium®-biofungicide decreased the disease incidence in the infested fields when compared with the non-treated control and the difference between Chaetomium-biofungicide and chemical pesticide treated fields were not significantly differed. The field experiment was carried out in Chiang Mai province, Thailand, where the soil was seriously infested with P. infestanand wherein disease previously destroyed the potato plants and resulted in total loss of the yield. Ketomium® biofungicide reduced late blight incidence by 38% as seen in Figure 2 .
3. The control of citrus rot disease with Chaetomium biofungicide in Cambodia
P. ultimumwas firstly recorded by our investigation to cause citrus (Citrus reticulaBlanco) root rot in Cambodia. The experimental field was carried out in 1 ha of 200 trees of citrus orchard in Battambang province where the infested soil with P. ultimumcausing root rot disease. It was observed before experiment that P. ultimuminfected the citrus trees over 90%, and mostly citrus trees were completely destroyed which can be seen the sign of yellowing and small leaves, dieback and root rot. The four-year-old citrus trees were selected for experiment with the same disease level.
The pathogen causes a serious damage almost everywhere planted to citrus in Battambang province. P. ultimuminfects citrus plants starting from seedlings which show yellow leaves, die back, stem rot, root rot and die. The infected citrus trees slowly decline from the second year planting and gradullay died which starting from six to seven years old, even using the chemical fungicides. The reserch found that the detached leave method was proved that only three days inoculation of P. ultimum, the citrus leaves turned to pale yellow and completely dark brown. The re-isolation the aggressive pathogen from lesion confirmed its pathogenicity. In field expriment, chemical fungicide, Chaetomiumand Trichodermatreamenrts were compared and periodically applied every month to four-year old citrus trees in one year. All treatments were sprayed above plants and to rhizosphere soil every month as metalaxyl-10 g/20 L of water in combination with chemical fertilizers, Chaetomiumtreatment (20 g/20 L of water) and Trichodermatreatment (20 g/20 L of water). It was noted that all treated citrus trees significantly recovered within 3–4 months of applications. As it was seen new leave flashes and roots emerged, then the citrus trees were recovered from rot root diseaase. The biological products of either Chaetomiumor Trichodermashowed significant disease control along with the metalaxyl chemical fungicide .
4. Application of Chaetomium biofungicide to control white root disease of Para rubber trees caused by Rigidoporus microporus
White root disease caused by Rigidoporus microporus(Figures 3 and 4) that was controlled by Ch. bostrychodesBN08, Ch. cupreumRY202 which inhibited the growth of pathogen over 50%. Chaetomium bostrychodesBN08 and Ch. cupreumRY202 were grown over the colony of R. microporuswithin 30 days. The crude extracts from Ch. cupreumRY202 showed the best growth inhibition of R. microporuswith ED50 values of 170, 402, and 1,220 μg/L, respectively. Rotiorinol is a bioactive compound produced from Ch. cupreuminhibited the growth of R. microporuswhich the ED50 value of 26 μg/L. The bioformulation of Ch. cupreumRY202 in the powder and oil form significantly inhibited R. microporusto infect the root of the rubber trees as reported by Kaewchai and Soytong . Chaetomium cupreumRY202 formulated as biofungicide to control white root disease of para rubber was resulted to disease reduction in the treatments of Ch. cupreumRY202 in the powder form and oil form of 75%. This is the first report of our study using Ch. bostrychodesand Ch. cupreumto control the white root disease of para rubber.
5. Application of Chaetomium antagonistic fungi to plant parasitic nematodes and insect control
Diverse research was on Chaetomium which carried out for agricultural purpose. Some reserchers demonstrated the endophytic Chaetomiumexhibited to antibitosis against nematodes e.g. root-knot nematode (Meloidogyne incognita) and hatch of soybean cyst nematode (H. glycines) and Globodera pallida(cyst nematode) or insects e.g. cotton aphids (A. gossypii) and beet armyworms (Spodoptera exigua).
In , Nitao et al. reported that the culture broths from Ch. globosuminhibited the egg hatch and juvenile mobility of root-knot nematode (Meloidogyne incognita) and also inhibited the hatching of soybean cyst nematode (H. glycines). It demonstrated that avipin is an active low molecular weight compound responding for antoganistic activity. But the testing on Muskmelon (C. melo) plants in steamed and unsteamed soil were inoculated with root-knot nematodes and different concentrations of avipin were not clearly shown. Zhou et al. recorded that Ch. globosumTAMU 520, is endophyte from cotton (G. hirsutum) and systemically colonize the cotton plants through seed treatment. The endophytic Ch. globosumsuppressed the infection of root-knot nematode (Meloidogyne incognita) which reduced female reproduction.
In 2012, Ch. globosumwith nematicidal activity, metabolite and application is patented in China as a patent No. CN102925369A in 2012 by a group of Chinese Scientists which claimed that Ch. globosumNK106 (CGMCC6716) is preserved number. Chaetoglobosin A prevents the plant parasitic nematode due to its high toxicity and nematicidal activity against the juvenile stage of Meloidogyne incognita. Chaetoglobosin A at 300 mg/mL showed the lethality is 90%, decreased the nematode eggs by 63%. In , Hu et al. stated that chaetoglobosin A, the secondary metabolites produced by Ch globosumNK102 expressed the nematicidal activity Meloidogyne incognita. Chaetomium globosumNK102 also showed repellant second-stage juveniles. Chaetoglobosin A showed strongly adverse effects in secondary stage mortality of nematode with 99.8% at 300 μg /mL (LC50 = 77.0 μg/mL) at 72 h. Chaetoglobosin A and filtrates from Ch. globosumNK102 were not affect on egg hatching until 72 h. The filtrate treatments inhibited the penetration of second-stage juveniles at 12.5% dilution treatment. Chaetoglobosin A also inhibited the penetration of secondary stage and reduced the number of nematode eggs. Kooliyattil et al. found Ch. globosumas a fungal parasite which isolated from egg of Globodera pallida(cyst nematode) in USA. It showed the greatest reduction of the infection by G. pallidain potato of about 76%. In , Khan et al. reported that endophytic Ch. globosumYSC5 showed nematicidal metabolite activities against the second stage juveniles of Meloidogyne javanica. Chaetoglobosin A, chaetoglobosin B and flavipin strongly inhibited (91.6, 83.8 and 87.4%, respectively) on mortality of the second stage juveniles at 200 μg/mL with LC50 values of 88.4, 107.7 and 99.2 μg/mL after 72 h, respectively, 3-methoxyepicoccone and 4,5,6-trihydroxy-7-methylphthalide moderately inhibited at 78.0 and 75.5%, respectively with LC50 values of 124.0 and 131.6 μg/mL, respectively. The promising metabolites Chaetoglobosin A, chaetoglobosin B significantly reduced nematode reproduction in pot experiment.
Chaetomiumalso showed insect control which was recorded by Zhou et al. who stated that endophytic Ch. globosumshowed negative affect on the fecundity of cotton aphids (A. gossypii) and beet armyworms (Spodoptera exigua). The beet army worms colovized on Chaetomiumtreated plants were with smally head capsule.
Our research and development on Chaetomiumbiological products have been investigated since 1989. The first biological product of Chaetomiumis contributed as a new broad spectrum biological fungicides from Chaetomium(Thailand Patent No. 6266, International Code: AO 1 N 25/12 and registered as Ketomium® biofungicide for plant disease control) which has been developed and improved from 22-strains of Ch. cupreumCC01-CC10 and Ch. globosumCG01-CG12 in the form of pellets, powder and liquid formulations. The practical integrated biological for plant pathogens is successfully introduced to farmers. Technology of disease control can be demonstrated either alone or integrated with other control measures. The products are scientifically proved not only for protection but also with curative effects as well as promoting plant growth. The formulations have been successfully used in infested field-soils integrated with cultural control for the long-term protection against durian and black pepper (Piper nigramL.) rot caused by Phytophthora palmivora,citrust rot caused by Phytophthora parasiticaand strawberry rot caused by Phytophthora cactorum,tomato wilt caused by Fusarium oxysporumf. sp. Iycopersiciand basal rot of corn caused by Sclerotium rolfsii.Further research is undergoing to develop bioactive metabolites from active strains of Chaetomiumspp. for plant disease control and immunity.
7. Efficacy of Chaetomium to control brown leaf spot of rice
The active metabolites of Chaetomium cochliodesinhibited spore production of Drechslera oryzaecausing brown leaf spot of rice var. Pittsanulok 2. Chaetomium cochliodeswas reported to be a new antagonist to control brown leaf spot of rice var. Pittsanulok 2. Bio-fungicides produced from Ch. cochliodeswere developed from active strain of Ch. cochliodesresulted in crude metabolites, powder, and liquid formulations which significantly inhibited the brown leaf spot of rice and increased plant growth. They significantly reduced leaf spot of rice var. Pitsanulok 2. The biopowder, crude metabolite and benlate-fungicide applied to rice seedlings at 40 days revealed plant height of 13, 13 and 12 cm, respectively when compared to the control (8 cm). The bio-powder, crude metabolite and benlate showed plant height of 50, 50 and 48 cm, respectively when compared to the control (21 cm) for 70 days. It was concluded that crude metabolite produced significantly higher rice growth parameters than the non-treated control .
8. Efficacy of Chaetomium to control fusarium wilt
The metabolites extracted from Ch. cupreumCC3003, Ch. globosumCG05, and Ch. lucknowenseCL01 significantly inhibited growth and spore production of F. oxysporumNHP-Fusa-2 (Figure 5). The MeOH extract of Ch. cupreumCC3003 revealed to be more effective spore inhibition of F. oxysporumthan the others which the ED50 was 85 μg/mL. The ED50 of hexane crude extract was 49 μg/mL, and EtOAc crude extract was 62 μg/mL in Ch. globosumCG05 and Ch. lucknowenseCL01. Metabolites extracted from Ch. cupreumCC3003, Ch. globosumCG05, and Ch. lucknowenseCL01 can be used to control tea wilt and root rot diseases caused by Fusarium oxysporum.It was the first time that F. oxysporumreported the causal pathogen of wilt and root-rot disease of tea in Vietnam .
The ED50 value of hexane crude extract from Ch. globosumN0802 inhibited Fusarium oxysporumf. sp. lycopersiciNKSC01 causing tomato wilt var. Sida at 157 μg/mL. The crude hexane from Ch. lucknowenseCLT and crude methanol from Trichoderma harzianumPC01 showed ED50 values of 188 and 192 μg/mL. The developed biofungicides - namely N0802, CLT and PC01 showed significantly higher wilt reduction of 44, 36 and 41%, respectively, than prochoraz fungicide (22%). All biofungicides significantly increased the yield more than prochoraz and inoculated control.
9. Efficacy of Chaetomium to control phytophthora root rot in citrus
Hung et al.[47, 48] found that pomelo rot caused by Phythopthora nicotianaein Thailand (Figure 6). Crude metabolites of Ch. globosum, Ch. lucknowense, Ch. cupreumshowed antifungal activities against the growth of P. nicotianae, with ED50 of 3–101 μg/mL (Figure 7).
ChaetomiumCG05, CL01, and CC3003 were reported to antagonize P. nicotianaeshowing inhibition between Chaetomiumspp. and P. nicotianaebefore contact was made. The colonies of CG05 and CL01 made contact with P. nicotianaecolonies without the clear zone of inhibition (Figure 7: A3 and B3). CG05, CL01, and CC3003 grew over colony of P. nicotianaein biculture plates in 30 days. Hyphae of Chaetomiumpenetrated or coiled around hyphae of P. nicotianae, maceration and discoloration of P. nicotianaeKA1 colonies (from white to light yellowish-brown). Application of living Chaetomiumspp. and metabolites reduced root rot of pomelo by 66–71% and increased plant weight by 72–85% compared to the non-treated control.
10. Biofungicide from Chaetomium elatum ChE01 against banana anthracnose caused by Colletotrichum musae
Colletotrichum musaeis seriously caused banana anthracnose. Chaetomium elatumChE01 showed antifungal activity to inhibit the growth of C. musaein biculture evaluation over 60% and the spore production of C. musaewas inhibited 57% in biculture trial. Metabolites from Ch. elatumChE01 (crude methanol, crude ethyl acetate and crude hexane extracts) inhibited the spore production of C. musaewith the ED50 values of 5, 7 and 19 μg/mL, respectively. The bio-fungicide produced from Ch. elatumChE01 showed significantly better reduction of disease prevalence than benomyl fungicide. It is reported for the first time that biofungicide produced from Ch. elatumChE01 controlled banana anthracnose caused by C. musaefor the first time. Chaetomium elatumChE01 produced a new chaetoglobosin V, two natural products, prochaetoglobosin III and prochaetoglobosin IIIed, six known chaetoglobosins B-D, F and G and isochaetoglobosin D  implying to a control mechnism of antibiosis. Moreover, crude methanol extract higher of Ch. elatumChE01 showed significantly high spore inhibition of C. musaeand the ED50 value was 5 μg/mL. The crude ethyl acetate and crude hexane extraction showed ED50 values 7 and 19 μg/mL, respectively. The higher concentration showed more inhibition of pathogens than the lower ones (Figure 8).
The coffee var. arabica plants were inoculated with 1 x 106 spores/mL suspension of the anthracnose pathogen (Colletotrichum gloeosporioides). Ten wounds were artificially made on leaves/ seedling with the fifth leaf from the top. Wounds were punctured with sterilized needles 10 times. The treatments were usually applied at 15 day intervals: T1 was inoculated with anthracnose pathogen, T2 was treated with a spore suspension of Ch. cupreumCC3003 at concentration of 1 x 106 spores/mL, T3 was treated with a biofungicide powder of Ch. cupreumCC3003 at a concentration of 10 g/20 L of water, T4 was treated with nano- trichotoxin-A50 (made from Trichoderma harzianumPC01) and T5 was treated with nano-rotiorinol made from pure compound of Ch. cupreumCC3003). Nano- trichotoxin-A50 and nano-rotiorinol were produced by Dr. Kasem Soytong and Joselito Dar at the Biocontrol Research Laboratory, KMITL, Bangkok, Thailand . T. harzianumPC01 reported to produce antibiotic polypeptides trichotoxin A50 . Moreover, Vilavong and Soytong  reported that crude extracts with hexane, ethyl acetate and methanol from Ch. cupreumCC3003 expressed significant inhibition of C. gloeosporioides(coffee anthracnose) with ED50 values of 13, 11 and 28 μg/mL, respectively. Metabolites of Ch. cupreumCC3003 showed antifungal activity against C. gloeosporioideswith abnormal appearance of spores of tested pathogen. A powder of the biofungicide produced from Ch. cupreumreduced anthracnose 54%.
11. Biodegradable nano-particles constructed from active natural products of different species of Chaetomium for immunity
Chaetomiumspecies have been reported to degrade cellulolytic plant debris into soil to increase soil fertility as well as organic matter in the soil, and a specific isolate of Ch. globosumwas reported to inhibit Pyricularia oryzaecausing rice blast . Soytong et al. showed that chaetoglobosin C from Ch. globosumKMITL-N0805 actively inhibited several plant pathogens, such as C. lunata(leaf spot of corn), Colletotrichumsp. (citrus anthracnose), and Fusarium oxysporumf.sp. lycopersici(tomato wilt). Kanokmedhakul et al. reported that Ch. globosumKM ITL-N0802 produces a novel anthraquinone-chromanone compound, named chaetomanone, and known compounds as chaetoglobosin C and echinulin. Chaetomanone and echinulin were reported to be inhibitors of M. tuberculosiscausing Tuberculosis of human being.
The biodegradable nanoparticles from natural products of active metabolites of Chaetomiumspp. are further investigated and discovered as a new scientific investigation, namely microbial degradable nano-elicitors for inducing immunity in plants (the authors).
In recent years, scientists have interested nanoparticles possessing biological properties [53, 54]. The nanotechnology for agriculure is interested in various areas . Plant disease control is to decrease or eliminate the nontarget effects either abiotic or biotic factors. Nano-sciences have become a new method to restructure materials at atomic level. Molecular nanotechnology can construct the organic materials into defined structures and atom by atom . Natural products from Chaetomiumspecies proved to be functioned for antifungal strategy against several plant pathogens . The alternative disease control is to acheive, safe, effective, and environmentally friendly. The construction and characterization of copolymer nanoparticles loaded with bioactive compounds from Chaetomiumspecies have been searched rather than toxic chemical pesticides. The natural products from Chaetomiumspp. constructed to be fine particles at molecular level as degradable nanoparticles used to control plant disease and induce plant immunity. Biocontrol research unit, Faculty of Agricultural Technology, King Mongkut’s Institute of Technology (KMITL), Bangkok, Thailand developed the research on biocontrol technology for years. Degradable nano-CGH, nano-CGE, and nano-CGM constructed from Ch. globosumKMITL-N0805 actively inhibited Curvularia lunatacausing leaf spot disease of rice var. Sen Pidoa in Camobodia. The effective dose of 50% (ED50) of degradable nano-CGH, nano-CGE, and nano-CGM were 1.21, 1.19, and 1.93 μg/mL, respectively at very low concentration was sufficeint to inhibit leaf spot pathogen of rice. These biodegradable nanoparticles actively penetrated to the pathogen cells causing to their disruption and distortion. Those pathogen inocula lost pathogenicity according to preliminary Koch’s postulate test. The nano-CGH, nano-CGE, and nano-CGM inhibited spore production by 93%, 93%, and 84%, respectively and resulted antifungal activity against C. lunatawith ED50 values of 1.2, 1.2, and 1.9 μg/mL, respectively.
The applications of degradable nano-CGH, nano-CGE, and nano-CGM to inoculated C. lunataon rice seedlings var. Sen Pidoa reduced disease incidence in pot experiments. Degradable nano-CGH and nano-CGM gave higher disease reduction of rice leaf spot caused by C. lunata(61%) than nano-CGE (54%). These nanoparticles significantly increased the height and number of tillers of the rice plants 60 days after treatment .
Ditta  stated that application of chemical pesticides causing climate change, and affected to urbanization, and natural resources. Those chemicals runoff or accumulate toxic pesticides in soil and it is needed to solve these problems immediately. However, there are still a few reports for the use of nanocarrier systems in agriculture . Rai and Ingle  suggested that nanotechnology provides efficient to control diseases and insect pests. Ditta  added that nanotechnology has a great potential in agriculture due to its enhancing life quality, especially in crop production. Nanotechnology should be carefully evaluated for postive and negative impacts as done with any new technology. Some nanoparticles are formulated to contain chemical pesticides in colloidal suspensions or as powders, at the nano or micro scale that must be noticed. Soutter  stated that application of nanotechnology in agriculture should be done in precision farms and become the new “industrial revolution” in agriculture. Ditta  suggested that there is a great potential for nanoscience and nanotechnology to face various challenges in agriculture. Perlatti et al.  expressed that nanoparticles serve as “magic bullets” that contains the bioactive substances from antagonistic fungi enable penetrating through cuticles and tissues, and constantly releasing active substances. The most popular shapes of nanomaterials being used for biocides delivery are nanospheres, nanocapsules, and nanogels. These preparations are advantageous in increasing the stability of active organic compounds, systemic activity, synergism, and specificity, with reducing foliar settling and leaching. The amount of pesticide dosage, number of applications, human exposure to pesticides, and environmental impacts are reduced. The nano formulation is employed in synthetic insecticides and alternative products such as herbal extracts and microorganisms to control insects.
Dar and Soytong  first characterized their electrospun materials through visual observation by the naked eye. It was observed that the control has white color. The size of the control nanoparticles ranged from 185 to 218 nm, while the extract-loaded nanoparticles was 241 nm. Tann and Soytong  reported that bioformulations and nano product from Ch. cupreumCC3003 showed a good control leaf spot of rice var. Sen Pidoa caused by C. lunata. Vilavong and Soytong  reported that the application of nano-rotiorinol, nano-trichotoxin and a spore suspension of Ch. cupreumreduced anthracnose incidence of 46, 43 and 18%, respectively while the inoculated control had high anthracnose disease caused by Colletotrichum gloeosporioides(Figure 9). The application of bio- formulation of Ch. cupreumin a powder form, nano-rotiorinol, and nano-trichotoxin to reduce coffee anthracnose was reported for the first time in Laos.
12. Testing bio-formulations and nano-products against anthracnose of coffee
The powder biofungicide of Ch. cupreumCC3003 at 0.5 g/L of water showed effectively control anthracnose of coffee which caused by C. gloeosporioides,resulted a disease index (DI) of 0.9 after application. The biodegradable nano-rotiorinol, nano- trichotoxin and living spores of Ch. cupreumgave DI of 1.07, 1.14 and 1.62, respectively compared to non-treated control (1.99). However, a biofungicide powder produced by Ch. cupreumCC3003 showed the highest disease reduction of 54%. The biodegradable nano-rotiorinol resulted in decrease of anthracnose diseasae 46%. The biodegradable nano-trichotoxin and spores of Ch. cupreumdecreased the anthracnose disease of 42 and 18%, respectively, when compared to the non-treated control. Biofungicide produced from Ch. cupreumCC3003 provided a good control effectively to coffee anthracnose caused by C. gloeosporioides. Moreover, it is concluded that biodegradable nano-microbial elicitors from Chaetomiumand TrichodermaPC01 was expressed to induce plant immunity through phytoalexin production against anthracnose of coffee caused by C. gloeosporioides.
13. Natural product of nano-particles constructed from Chaetomium spp. for rice blast disease control
Song et al.  stated that agricultural nanotechnology is started to be a new tool for plant disease management by restructuring natural active metabolites at the molecular level. Metabolites’ nanoparticles contain bioactive compounds from natural products that can rapidly and effectively penetrate through plant cells and can increase the stability of active compounds to control plant diseases. This research finding is a new scientific discovery suggesting that natural products of nano-particles derived from Ch. cochliodesisolate CTh05 actively controlled Magnaporthe oryzaeisolate PO1causing rice blast for the first time.
Chaetomium cochliodesisolate CTh05 expressed actively against the rice blast pathogen, Magnaporthe oryzaeisolate PO1 on rice var. RD57 in Thailand. The rice blast reduced infection (59%) after applying nano-CCoM at 7 μg/mL, followed by nanoCCoE and nanoCCoH which reduced the blast infection of 57 and 50% respectively. But tricyclazole fungicide reduced blast infection of 55% in 30 days. Later, Song et al. further reported on antifungal efficacy of microbial nano-particles constructed from Ch. elatum, Ch. lucknowenseand Ch. brasilienseagainst rice blast pathogen in rice var. PSL 2 in Thailand. Nano particles of Ch. elatum(nano-CEE, nano-CEM and nano-CEH) inhibited sporulation of M. oryzaewhich the ED50 values of 7, 8 and 16 μg/mL. respectively. The nano-CBH, nano-CBE and nano-CBM constructed from Ch. brasiliensesuppressed sporulation of the blast pathogen with the ED50 values of 6, 9 and 13 μg/mL, respectively. Nano-particles from Ch. lucknowense(nano-CLM, nano-CLE and nano-CLH) inhibited sporulation of rice blast pathogen with the ED50 values of 5, 7 and 10 μg/mL, respectively. Interestingly, all tested nano-particles deriverd from Chaetomiumcaused pathogenicity lost of rice blast pathogen due to broken down of pathogen cells. The treated rice leaves with nano-CBH from Ch. brasilienseshowed the Rf values of 0.05 and 0.28 which defined to produce Sakuranertin and Oryzalexin B as phytoalexin against blast disease. Our reserch findings have developed to be a natural product of nanoelicitor for rice blast immunity.
14. Concluding remarks
The scientific investigations have proved that Chaetomiumbiofungicide can be directly applied into rhizosphere soil. Chaetoimumbiofungicide can be sucessfully applied to control of various diseases, except for downy mildew, powdery mildew and rust as they are obligate parasites. Hence, it can be applied to control plant diseases for good agricultural practices (GAP), pesticide free production (PFP), non agrochemical production (NAP) and organic agriculture (OA). Chaetoimumbiofungicide and biostimulants are applied to implement integrated plant disease control. It is proved to be a biological agent for plant diseases which has been successfully integrated with other control measures for suitable disease control. Chaetomiumbiofungicide showed protective and curative effects in controlling plant disease and promoting plant growth. It has been successfully applied to the infested soils for the long-term protection against many plant diseases. The new bioactive compounds from Ch. globosum, Ch. cupreum, Ch. elatum, Ch. cochliodes, Ch. brasiliense, Ch. lucknowense, Ch. longirostre,and Ch. siamenseare reported to inhibit plant pathogens. These active natural products from different strains of Chaetomiumare further developed to be biodegradable nanoparticles from active metabolites as a new discovery of scientific investigation which used to induce plant immunity, namely microbial degradable nano-elicitors for inducing immunity in plants. The biodegradable nano-elicitors are developed to induce plant immunity through phytoalexin production in plants e.g. inducing tomato to produce alpha-tomaline against Fusariumwilt of tomato, capsidiol against chili anthracnose, sakuranitin against rice blast, scopletin and anthrocyaidin against Phytophthoraor Pythiumrot Durian and scoparone against Phytophthoraor Pythiumrot of citrus etc.
Chaetomiumis a unique board spectrum biofungicide which is registered in Thailand, China, Laos, Vietnam, Cambodia, and BioAgriCert, IFOAM (International Federation of Organic Agriculture Movements). These countries contributed and tested Chaetomiumbiofungicide. At present, it is registered in Cambodia, Laos, Vietnam and being registered in China and BioAgriCert, IFOAM. Biodegardable nano-elicitors constructed from active metabolites from Chaetomiumspecies are the new unique science for plant immunity which have been contributed in Thailand, Finland, Indonesia, India, Laos, Cambodia, Myanmar, Vietnam and China. Our experienced research investigation in this area of specialization would be contributed for sustainable development goals (SDGs) in agriculture.
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