Spider mites are members of the Acari mite family Tetranychidae , which includes about 1, species. They lay small, spherical, initially transparent eggs and many species spin silk webbing to help protect the colony from predators ; they get the "spider" part of their common name from this webbing. Hot, dry conditions are often associated with population build-up of spider mites. One female can lay up to 20 eggs per day and can live for 2 to 4 weeks, laying hundreds of eggs. This accelerated reproductive rate allows spider mite populations to adapt quickly to resist pesticides , so chemical control methods can become somewhat ineffectual when the same pesticide is used over a prolonged period. Spider mites, like hymenopterans and some scale insects , are arrhenotochous : females are diploid and males are haploid.

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Spatial distribution of phytophagous mites Acari: Tetranychidae on strawberry plants. Marcos A. Fadini I ; Hamilton G. Vilela II. Biologia Animal, Univ. Many phytophagous mites can attack strawberry plants, Fragaria x ananassa , among them the southern red mite, Oligonychus ilicis McGregor, and the two-spotted spider mite, Tetranychus urticae Koch.

They are found together feeding on the same plant on the upper and underside of the leaves, respectively. Here we studied the choice for feeding sites of O. The first hypothesis tested whether the feeding site choice would be related to the fitness of the species.

The second hypothesis dealt whether the feeding site would be determined by the presence of a heterospecific mite. We evaluated the preference, biology and reproductive success of O. The preference for the leaf surface correlated with the reproductive success of the species measured by the intrinsic growth rate.

The choice pattern of feeding sites did not alter when the choice test was applied using sites previously infested by heterospecific. Although O. The possibility of those species stay together on strawberry plant increases the damage capacity to the culture.

Key words: Herbivory, interespecifc interaction, food web, Tetranychus urticae , Oligonychus ilicis , Fragaria. Em morangueiro, O. Dessa forma, apesar de explorarem recursos alimentares similares, ou seja, a epiderme foliar, O. Morris Enquanto que a mosca minadora, Liriomyza trifolii Burgess , que ocorre junta a B.

As ninfas de B. Adultos de O. Biologia de O. Para o estudo de O. Quarenta discos foliares foram colocados com a face adaxial para cima e outros 40 discos foram colocados com a face abaxial para cima. Colocaram-se, em cada disco foliar, dois ovos de um dia de idade de O.

Os discos foram preparados, acondicionados e individualizados em placas de Petri conforme procedimento descrito no primeiro experimento. Fato semelhante ocorreu com T. As faces escolhidas por O. Para O. O comportamento relatado neste estudo foi semelhante ao observado por Foott , para Tetranychus telarius Koch e Panonychus ulmi Koch Acari: Tetranychidae. Quando isso acontece, T.

Entretanto, Hairston et al. Apesar de O. Ao Prof. Agrawal, A. Future directions in the study of induced plant responses to herbivory. Applied demography for biologists with special emphasis on insects. Oxford University Press, New York, p. Efeito de Tetranychus T. Mattiacci, A. Effects of a mixed species infestation on the cassava mealybug and its encrytid parasitoids. Control Competition between two species of mites. Experimental results. Factors influencing intensity.

Evolutionary changes in the Tetranychidae, p. Sabelis eds. Amsterdam, Elsevier, p. Community structure, population control, and competition. Applied survival analysis: regression modeling of time to event data.

New York, Wiley, p. Effects of sessile whitefly nymphs Homoptera: Aleyrodidae on leave-chewing larvae Lepidoptera: Noctuidae. Doostdar, H. The role of plant rapidly induced responses in asymmetric interespecific interactions among insect herbivores. Behaviour and indirect interactions in food webs of plant-inhabiting arthropods. Induced responses to herbivory. University of Chicago Press, Chicago. Community patterns and competition in folivorous insects. Statistical inference on associated fertility life table parameters using Jackknife technique: computational aspects.

Interspecific competition between root-feeding and leaf-galling aphids mediated by host-plant resistance. Ecology Toward and ecological synthesis: A case for habitat selection. Oecologia Biology of Liriomysa. Brasil Acarologia Life types of spider mites, p. Takabayashi, S. Oviposition preferences of herbivores are affected by tritrophic interaction webs.

Nonparametric statistics for the behavioral sciences. New York, McGraw-Hill, p. New York, Freeman, p. The milker-killer in spatially structured predator-prey interactions. Oikos All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.

Services on Demand Journal. Agradecimentos Ao Prof. How to cite this article.





Spider mite




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