15 Biological Studies and Pest Management of Phytophagous Mites in South America

Carlos Vásquez1,*, José Morales-Sánchez1, Fernando R. da Silva2 and María Fernanda Sandoval3 1Universidad Centroccidental Lisandro Alvarado, Decanato de Agronomía Departamento de Ciencias Biológicas. Barquisimeto, Estado Lara 2University of Amsterdam. Institute for Biodiversity and Ecosystem Dynamics (IBED) Research Group of Population Biology, Amsterdam 3Instituto Nacional de Salud Agrícola Integral (INSAI). Av. Principal Las Delicias. Edif. INIA – Maracay, Estado Aragua 1,3Venezuela 2The Netherlands


Introduction
Mites are the most diverse representatives of an ancient lineage in phylum Arthropodasubphylum Chelicerata-subclass Acari.Their body plan is strikingly different to that of other arthropods in not having a separate head, instead, an anterior region, the cephalothorax, combines the functions of sensing, feeding, and locomotion (Walter & Proctor 1999).Antennae, mandibles and maxillae are also absent; rather, a pair of often pincer-like mouthparts are present, the so-called chelicerae.Those members of the subclass Acari, which feed on plants, are known as phytophagous mites.Mites constitute one of the most heterogeneous cheliceran groups, since they are extremely diverse in their morphology, biology and ethnology, enabling them to colonize different environments.Their remarkable diversity in acarine morphology is reflected in the variety of ecological and behavioral patterns that mites have adopted (Krantz 2009).Thus, species can inhabit soil, litter (i.e.Cryptostigmata, Mesostigmata and Prostigmata), water (Hydrachnidia) or plants (Prostigmata or Mesostigmata).Phytophagy is widespread enough among the Trombidiform Acariformes so as to suggest that there was an early evolution commitment to plant feeding by several primitive predaceous and saprophagous trombidiform lineages (Krantz 2009).Some Prostigmatan mites, chiefly spider mites, false spider mites and eriophoid mites, use their specialized mouthparts to feed on the vascular tissues of higher plants and with their activity they can cause losses to field and protected crops (Evans 1992), becoming economically important pests.
There are three or four pairs of normal setae in two rows (v1-2, sc1-2) and two pairs of eyes on the dorsal propodosoma.On the opisthosomal dorsum, there are five rows of setae: c, d, e, f and h.The number, location, length and structure of dorsal setae are of taxonomic significance.Female genital pores are transverse and are bordered anteriorly by a genital flap and laterally by characteristic cuticular folds.The structures of the paired lateral claws and the medial empodium are of taxonomic importance.The empodium may be claw-like or pad-like with tenant hairs.Claws may bear dorsal or ventral hairs.The tarsi of legs I and II bear duplex setae (a long solenidion and a short normal tactile seta with their bases joined together.The number of duplex setae and their positions are of taxonomic significance.
Wedge-shaped males are smaller than ovoid females and have a tapering opisthosoma.Males have a protrudable aedeagus, the shape of which is very important in species identification.
Life history and biology: as other Prostigmata mites, the spider mite life cycle consists of egg, larva, protonymph, deutonymph and adult stages, except for some Schizotetranychus and Eotetranychus species, which may have one nymphal stage in males (Zhang 2003).Moulting takes place during the quiescent stages between each active stage.Development from egg to adult often takes one to two weeks or more, depending on mite species, temperature, host plants, humidity and other environmental factors.Males develop slightly faster than females and soon they search for and fight for quiescent deutonymph females.Unfertilized eggs produce only haploid males, while fertilized eggs produce diploid females.

Tetranychus urticae Koch
The two-spotted spider mite (TSSM) is considered one of the most harmful tetranychid species in agriculture both in temperate or tropical countries (Cerna et al. 2009, González Zamora et al. 1993).Although a recent checklist includes some 920 host plant species in 70 genera (Bolland et al. 1998), only 150 of these host species have relevant economic value.The TSSM feeds on cell chloroplast on the underside of the leaves and symptoms become clearly visible on the upper side as characteristic whitish or yellowish punctures which, under high population levels, can join and become brownish o even cause leaf drop and plant death (Tomczyk & Krompczyńska 1985, Zhang 2003).
Due to its relevance and economic impact on tropical agriculture in South America, the TSSM has been the most extensively studied spider mite species.A number of papers related to biological aspects of the TSSM are available (Table 1 (Forero et al. 2008).Even though a lower number (19.4%) of phytophagous mites was found in plots chemically treated, a lower percentage (damage index 1 and 3, 8 and 13% less, respectively) of leaf damage was observed when Amblyseius sp. was released.On the other hand, the consumption rate (functional response) after a 24 h.period was 6.66 eggs, 18.06 larvae, and 19.15 nymphs under laboratory conditions and 4.56 eggs, 12.65 larvae, and 15.71 nymphs under greenhouse conditions (Forero et al. 2008).Greco et al. (2005) found that Neoseiulus californicus (McGregor) is a promising agent for successful TSSM control through conservation techniques, on strawberry crops in La Plata, Argentina.Accordingly, the authors showed that initial relative densities had an important effect on system dynamics.Thus, when pest/predator ratio was 5/1 (at initial pest densities from 5 to 15 females/leaflet) the final number of active T. urticae/leaflet was significantly lower than the economic threshold level (ETL), while at 20 females/leaflet this number did not differ from the ETL.At 7.5/1 ratio, the final number of active T. urticae/leaflet, at initial pest densities from 5 to 15 females/leaflet, reached the ETL without surpassing it.At 10/1 and 15/1 ratios, pest densities exceeded the ETL only at 15 initial T. urticae/leaflet.Since N. californicus showed to be very effective in limiting pest densities, conservation of this predator promoting favorable pest/predator ratios may result in early control of T. urticae.
Furthermore, Phytoseiulus macropilis (Banks) demonstrated a positive functional response (increases prey consumption).However, all indices evaluated showed that P. macropilis was unavailable to control the TSSM efficiently when the population numbers were low, possibly to keep itself in an environment with low populations (Ferla et al. 2011).Biological control by this predator is more efficient when five or more prey items are present at a given time.

Tetranychus cinnabarinus (Boisduval)
This species is commonly known as the carmine spider mite and it is associated with more than 120 host plant species such as cotton, strawberry, tomato, eggplant, and also ornamental species and fruit trees (Biswas et al. 2004).In Chile, the carmine spider mite is commonly found on carnation, strawberry, melon and beans from Arica, Parinacota and dessert areas where chemical control is frequently used (Klein & Waterhouse 2000).(Frei et al. 2003).In general, these defense mechanisms are considered plant responses to stressing conditions either abiotic (drought, salinity) or biotic (herbivore or pathogens attacks), which induce the development of physical barriers to prevent feeding or secondary metabolites affecting oviposition or survival (Tomczyk & Krompczyńska 1985, Gardner & Agrawal 2002).Vásquez et al. (2007) observed that mean oviposition of T. cinnabarinus females was significantly lower on 22-day-old-leaf disks, ranging from 0.98 to 1.17 eggs/female/day on ICA-Pijao and Coche beans cultivars, respectively ( Values in a file followed by same letter did not show significant differences (Tukey's Test; P<0.05) Number in parenthesis represent total egg number during a five day period.From Vásquez et al. (2007).
In general T. cinnabarinus females showed a higher rate of survival on 22 day-old disks, ranging from 5.67 to 6.63 living individuals in Tacarigua and Coche leaves; while on 55 dayold leaves survival ranged from 5.42 to 1.80 on Coche and ICA-Pijao, respectively.A significant survival reduction was observed on mites reared on 55 day old leaf disks from ICA-Pijao cultivar (Fig. 1), suggesting that this cultivar could dissuade to mite from feeding, affecting thus mite survival.

Red spider mites (Tetranychus desertorum Banks and Tetranychus ludeni
Zacher) The red spider mite, T. desertorum has been found on about 173 plant species in Argentina, Brazil, China, the United States of America, Mexico, Venezuela and some other countries (Bolland et al. 1998).This spider mite species might cause severe damage to bean plants, as T. urticae does (Moraes & Flechtmann 2008).In Venezuela, previous studies have demonstrated that bean cultivars are susceptible to T. desertorum attacks under irrigation conditions (Doreste 1984).Rivero & Vásquez (2009) showed that total developmental time of T. desertorum females on kidney bean 'Tacarigua' was 6.8 days, with partial duration of immature stages corresponding to 3.8, 1.4, 1.0 and 0.7 days for egg, larva, protonymph and deutonymph, respectively.Higher mean fecundity (6.93 eggs/female/day) was observed on day 4 and females lived during 10 days.From Morros & Aponte (1995a, b).
Table 3. Reductions of plant performance as effect of T. ludeni feeding on black beans in vegetative or reproductive stages under greenhouse and field conditions.

The avocado brown mite, Oligonychus punicae Hirst
The avocado brown mite (ABM) is considered an important tetranychid pest in southern California (USA), as high population densities can cause severe defoliation on several avocado cultivars (McMurtry & Johnson 1966;McMurtry 1985).This tetranychid mite predominantly feeds on the upper leaf surface, although feeding could extend to the lower leaf surface at high population levels (Tomczyk & Kropczynska 1985).Damage to host plants is shown by a bronze tone on the leaves, and is associated with the rates of oviposition and female production (McMurtry 1970).
In tropical America, the ABM has been reported in more than 20 plant species, such as Mangifera indica L., Musa sapientum L., Punica granatum L. and Vitis vinifera L. (Ochoa et al. 1994;Bolland et al. 1998).In Venezuela, it was previously recorded on Musa spp.from Sur del Lago, Zulia State (Freitez & Alvarado 1978;Quirós 1978).More recently, in Lara State, it has been observed as an occasional pest whose feeding on grape delays fruit ripening (Vásquez et al. 2008a).These authors provided information about life cycle, fecundity and longevity of the ABM on six grapevine cultivars (Tucupita, Villanueva, Red Globe, Sirah, Sauvignon and Chenin Blanc), under laboratory conditions at 27 °C, 80% RH, and L12:D12 photoperiod (Tables 4 and 5).
An effect of host plant on mite reproduction has been established for several Tetranychid species (e.g., de Ponti 1977;Ribeiro et al. 1988;Hilker & Meiners 2002;Praslička & Huszár 2004).Previous studies have demonstrated that grape leaves and fruits synthesize phenolic compounds in response to fungal attacks or abiotic factors (Morrissey & Osbourn 1999).Furthermore, Harborne (1994) hypothesized that low molecular weight phenol compounds could act synergistically with tannins to provide plant resistance.Thus, reproductive parameters of O. punicae seemed to be associated with flavonoid content of grape cultivars; the higher the flavonoids content, the lower the mites' fecundity (Fig. 3).These findings could be considered an ecological approach for sustainable pest management programs in grapevine in tropical areas.Fig. 3. Lineal regression between flavonoid content and mean oviposition of O. punicae on grapevine cultivars (y = 4.78 -36.42x).From Vásquez et al. (2008a).

Tenuipalpidae mites
The false spider mites include about 800 described species belonging to over 25 genera, mostly found in tropical and subtropical areas (Jeppson et al. 1975, Baker & Tuttle 1987).This family consists of three subfamilies: Tegopalpinae, Brevipalpinae and Tenuipalpinae, the two latter ones including most of the described species: Brevipalpus and Tenuipalpus are the two largest genera and also the most economically important pest on citrus (Kitajima et al. 1972), coffee (Chagas et al. 2000), passion-fruit (Kitajima et al. 1997) and ornamentals (Smith-Meyer 1979).Since 2004, Raoiella indica Hirst is also becoming more important in the Caribbean islands and northern countries in South America (Vásquez et al. (2008b).
The false spider mites are also known as flat mites because most species are dorsoventrally flattened.They are slow-moving and are usually found on the lower surface of the leaves near the midrib or veins.Some species feed on the bark while others live in flower heads, www.intechopen.comunder leaf sheaths or in galls.Only a small number of species belonging to a few genera have become pests of economic plants and they are most commonly found on tropical fruit crops and ornamental plants.
Life history and biology: Thelytoky is commonly observed in Brevipalpus mites, since female offspring consist in females and rarely males are found (Childers et al. 2001), being males and females haploid (Pijnacker et al. 1980).Life cycle of Brevipalpus is shown in figure 4, consisting in four active stages: larva, protonymph, deutonymph and adult; an inactive stage being observed between each active one.According to Goyal et al. (1985), developmental rate depends on temperature, relative humidity and host plant species.

Brevipalpus and Tenuipalpus species
Brevipalpus californicus (Banks), B. obovatus (Donnadieu) and B. phoenicis (Geijskes) constitute the major economically important species in this genus.These mites usually feed on lower leaf surface and aggregate along the mid-vein or major lateral veins and they inject toxic saliva into fruits, leaves, stems, and bud tissues of their host plant, while Tenuipalpus pacificus Baker and Probably the major threat related to these three Brevipalpus species is that concerning their ability to vectoring a virus borne disease called leprosis (Kitajima et al. 1996).Virus particles of citrus leprosis are short, bacilliform, 120-130 nm long (occasionally up to 300 nm), and 50-55 nm wide and occur mostly in parenchyma cells of the lesion area in affected orange leaves, fruits, or stems (Rodrigues et al. 2003).Leprosis is a serious disease on citrus from Brazil, Argentina, Paraguay and Venezuela, and probably Colombia and Uruguay (Childers et al. 2001).More recently, leprosis has been recorded in Panama (Dominguez et al. 2001) and it still represents a long term problem and causes severe damage on trees, yield reduction, and even death of trees if mite population control measurements are not taken into account (Rodrigues 2000).

The red palm mite, Raoiella indica Hirst
The red palm mite (RPM) was firstly reported in the Caribbean region in 2004 (Flechtmann & Etienne 2004).It is currently widely distributed in most of the Caribbean islands (Kane et al. 2005, Rodrigues et al. 2007).Subsequent mainland colonization was verified in Venezuela (Vásquez et al. 2008b) and Florida (Peña et al. 2008); and more recently, the pest has been reported to occur in Mexico (NAPPO 2009), Brazil (Návia et al. 2011) andColombia (Carrillo et al. 2011).The RPM may cause severe damage to Arecaceae, especially coconut (Cocos nucifera L.), but also on Musaceae and other plant families (Flechtmann & Etienne 2004, Flechtmann & Etienne 2005, Etienne & Flechtmann 2006).In coconut nurseries, mite feeding can provoke death of younger plants; meanwhile damage in adult plants is evidenced by a strong yellowish color in mature leaves (Peña et al. 2006, Welbourn 2005).After the red palm mite detection in the Americas, 70-75% fruit production decreasing has been estimated in Trinidad and Tobago and Venezuela (Návia 2008).Although the RPM primarily infests palms and bananas, some wild heliconia, gingers and other ornamental plant species growing under heavily infested coconut trees revealed small and sporadic colonies of the red palm mite (Roda 2008).However, according to Hoy et al. (2006), it is not clear whether these are valid host plants or whether the enormous mite populations on coconuts and other palms have temporarily moved on to substory plants under the palms.
Currently, the governments and researchers from those countries where the RPM has been recorded are making efforts to implement an alternative to pest management different from that of chemical control, since application of chemical products is not only hazardous to environment and public health, but also expensive.Thus, research is devoted to test the effectiveness of the predatory mite, Amblyseius largoensis Muma, the most frequent phytoseiid mite species found in association to the RPM in the Caribbean islands and Venezuela.Preliminary research has shown that this predator seems to be a promising agent of biological control (Carrillo et al. 2010, Rodríguez et al. 2010).However, when being considered in a population management program, other ecological strategies should also be included, such as using plant resistance from different genotypes which have been obtained www.intechopen.comIntegrated Pest Management and Pest Control -Current and Future Tactics 366 in northern Venezuela by Dr. Antonio Ruiz (Instituto Nacional de Investigaciones Agrícolas [INIA-Irapa]), organic or inorganic fertilization programs in order to reestablish soil fertility and lastly, irrigation to avoid abiotic stress in old and young coconut plantations.

Eriophyid mites
The Eriophyoidea is a large superfamily of worldwide distribution.About 3,000 species belonging to over 250 genera are known in the world and a number of new species have been recently described from natural vegetation in South America (Table 6).The superfamily consists of three families: Phytoptidae, Diptilomiopidae and Eriophyidae.About three-quarters of the described species in Eriophyoidea belong to the Eriophyidae.

Species
Host  Vásquez (2007) Table 6.Some eriophyoid mite species recently described from South America. www.intechopen.com Eriophyoid mites are tiny worm-like or fusiform mites and they form galls or live freely on various host-plants (Royalty & Perring 1996;Westphal & Manson 1996).The wounding and injecting of specific salivary secretions into host-cells result in a specific response of the affected leaf, stem, or bud tissues; such as gall differentiation, hypersensitive reaction, or non-distortive feeding effects and in some cases complex symptoms, considered as syndromes (Petanović & Kielkiewicz 2010).Most species are monophagous and many species are limited to plant species within a single genus, with few exceptions (Zhang 2003).
Most species cause little harm to their host plants, however, some rust mites and gall mites are important pests on economic plants.
Life cycle: Eriophyid mites passes through the egg, larva, nymph and adult stages.Both females and males complete their life cycle in about a week at an average temperature of around 25°C.The mating process is indirect, since male deposits spermatophores on host plants, and then the genital flap in the female presses the spermatophore into the body and crushes it.Females lay up to three eggs per day for up to a month, with a total of up to 87 eggs per female.

The coconut mite, Aceria guerreronis Keifer
The coconut mite is an invasive mite pest that has been disseminated and established rapidly in main coconut (C.nucifera) production areas (Návia et al. 2009) causing copra yield reductions, premature dropping of fruit (Moore & Howard 1996).A. guerreronis is mostly found in the meristematic region of fruit, under the perianth (Fernando et al. 2003).Development of colonies usually starts at earlier stages of fruit formation, resulting in discolored areas that frequently become larger and necrotic, longitudinal cracks and eventually producing an exudate (Haq et al. 2002).In addition to fruit damage, this mite attacks the growing tip of plantlets, turning it dark brown and often causing death of attacked plants in Brazil (Aquino et al.1968).
Despite the great economic importance of the coconut mite, information on basic aspects is scarce.Acording to Moraes & Zacarias (2002), the use of biological control agents based on the location of the A. guerreronis are crucial tools to manage this mite pest.

Tomato russet mite, Aculops lycopersici (Masse)
The tomato russet mite (TRM) is cosmopolitan in distribution and widespread in almost all areas where solanaceous crops are grown (Jeppson et al. 1975).This eriophyoid is one of the most common key pests of the commercially grown tomato, Lycopersicon esculentum Mill on a worldwide scale.In addition, the TRM host range includes tomatillo, potato, eggplant, poha (cape gooseberry), wild blackcurrant, popolo, wild gooseberry, blackberry, tobacco, bell pepper, cherry pepper, tolguacha, eggplant, Jerusalem cherry, hairy nightshade, black nightshade, horse nettle, morning glory, Jimson weed, Chinese thorn apple, petunia, nightshade, small flowered nightshade, amethyst, field bindweed, and Brinjal (Perring 1996).According to Duso et al. (2010), it is important to investigate: (a) TRM bioecological data useful to improve control strategies; (b) the different specialized intimate interactions that TRM establishes with different plants and/or different areas of the same plant; (c) the strength of the biochemical and physiological mechanisms/steps determining the intensity of closeness/dependence with the host plant.

Tarsonemid mites
The Tarsonemidae includes about 545 species of 45 genera widely distributed.This family consists of three subfamilies: Pseudotarsonemoidinae, Acarapinae and Tarsoneminae; the latter including most of the described species in the two large genera: Tarsonemus (over 270 species) and Steneotarsonemus (over 70 species).Tarsonemid mites exhibit various feeding habits, some species feed on fungus, algae, plants, and some of them can prey on parasite insects (Moraes & Flechtmann 2008).Some plant-feeding tarsonemid mites are pests of agricultural crops, most of them belonging to a few genera in the Tarsoneminae, except for the Polyphagotarsonemus.Since Tarsonemid mites feed on surface cells, more significant damage is observed in young tissues of the host plant.Symptoms are characterized by leaf discoloration with a silver aspect.Expanding leaves became shriveled or curled and eventually shed and plants severely attacked stop growing.Occasionally, plant tissue ontogeny is altered due to toxins injected.
Life history and biology: Tarsonemid mites are haplodiploid, being males produced by arrhenotoky and females by sexual reproduction; however, thelytoky has also been observed (Norton et al. 1993).Its life cycle consists of egg, larva, "pupa" and adult (male and female) stages, but "pupa" is an inactive stage in which the nymph stage takes place.
Polyphagotarsonemus latus (Banks) is undoubtedly the most important pest of many crops and ornamentals in field or greenhouses worldwide.This species disperses by wind, human transport of infested products and also through insects living on plants.P. latus females have been observed as phoront on Bemisia tabaci (Gennadius) on beans (P.vulgaris) in Colombia and on cucumber (Cucumis sativus L.) var.poinsett-76 and sesame (Sesamun indicum L.) var.INIA-1 in Venezuela (Bautista et al. 2005).
Life-history traits depend on temperature, host plants and even on varieties.On pepper, the developmental period (egg -adult) is, as an average, 4.1 days at 25°C for males and females, respectively.Adult female and male longevity is 11 and 15 days, respectively.The female/male sex ratio is 2.8 in the laboratory, and 2.3 on seedlings in a greenhouse.The intrinsic rate of increase is 0.359, the finite rate of increase is 1.43 individuals/female/day, the mean generation time 10.34 days and the net reproductive rate 41.0.
In 1997, the rice mite was first reported in Cuba (Ramos & Rodríguez 1998), causing about 30 -90% yield (Almaguel et al. 2000).Soon, S. spinki spread to the Caribbean (Haiti, Dominican Republic and Puerto Rico), Central America (Panama, Costa Rica, Nicaragua, Honduras and Guatemala), South America (Colombia and Venezuela) and North America (Mexico and USA) (Rodríguez et al. 2009, Sandoval et al. 2009).Although the rice mite has been detected in rice fields in Venezuela, important mite infestation focuses have not been observed to affect rice production in this country.
Pest control: Most information about control strategies of this species has been compiled in Cuba.In this country, nine predator species have been found, 4 Phytoseiid, 3 Ascid and 2 Laelapid species (Table 7).
Table 7. Predatory mites associated to S. spinki in rice fields in Cuba.
Another important tarsonemid species, Steneotarsonemus furcatus De Leon has been found on coconut, damaging fruit in Central America and in Brazil (Ochoa et al. 1994, Návia et al. 2005) and various gramineous species in Cuba (La Torre et al. 2005), and more recently, Steneotarsonemus concavuscutum Lofego & Gondim was examined on coconut in northeastern Brazil (Lofego & Gondim 2006).

Conclusions
In South America, there is a significant volume of literature dealing with taxonomy, biology and crop damage caused by phytophagous mites on agricultural crops.Research has provided a great deal of valuable information about their impact on several important crops in Brazil, Colombia, Mexico and Venezuela.At present, a multi-institutional and multidisciplinary project on the biological control of the coconut mite in Tropical America is being developed.As a preliminary step, some explorations have been conducted in target countries to assess the abundance of the coconut mite, the diversity and prevalence of the natural enemies associated with this pest, and to evaluate the potential of these natural enemies as biological control agents for their use in the IPM programs.In addition, much work has been carried out to determine other host plants of the coconut mite and its natural enemies.Furthermore, some Government and Research Institutions from Brazil, Trinidad and Tobago and Venezuela are making efforts to find some ecological strategies to control the Red Palm Mite Raoiella indica Hirst (Acari: Tenuipalpidae), and thus minimize its impact on commercial coconut farms and other important crops in tropical areas.

Table 1 .
).Some biological parameters of the TSSM in various host plant and environmental conditions in South America.
Population management: For decades population management of tetranychid mites has been based mostly on chemical control in South America.However, biological control is being increasingly used under greenhouse conditions, mainly in Argentina, Brazil, and Colombia.I n C o l o m b i a r e d u c t i o n s o f T S S M p o p u l a t i o n o n r o s e t r e e s h a v e b e e n o b s e r v e d a f t e r periodical release of Neoseiulus sp.

Table 2
dry weight of vegetative organs when mite infestation occurred in the early vegetative stage (Table3).
(Morros & Aponte 1994)e parameters were as follows: net reproduction rate (Ro) = 41.10 individuals; generation time (T) = 11.15days;intrinsicnaturalgrowth(rm) = 0.144 individuals/female/day, and finite natural increase rate ( ) = 1.155 individuals/female.Furthermore, T. ludeni is a worldwide pest that attacks various plant species, such as Phaseolus vulgaris L., representing a severe threat in several countries, including Venezuela(Morros & Aponte 1994).According to these authors, the life cycle (egg-adult) of T. ludeni lasted 9.98 and 9.25 days for females and males, respectively (26.34± 3.92ºC and 69.44± 19.44% HR).The life table also showed the following values: reproduction rate (Ro) 77.42; mean generation time (T) 19.63; intrinsic rate of natural increase (r) 0.2526 individuals/female/day; finite rate of natural increase ( ) 1.2874 individual/female/week.Morros & Aponte (1995a, b)evaluated the effect of two levels of mite infestation on vegetative and reproductive stages of the black bean P. vulgaris under greenhouse and field conditions.The authors observed greater reduction on number of leaves and internodes, leaf area, and

Table 4 .
Developmental time of different life stages of O. punicae in various grapevine cultivars.
Ochoa et al. (1994)03) Pest Management of Phytophagous Mites in South America 365 B. phoenicis have been observed feeding on the upper leaf surface of orchids(Childers et al. 2003).Ochoa et al. (1994)reported 177 host plant species in Central America, including 114 host plants for B. phoenicis, 29 for B. californicus and 34 for B. obovatus.