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Avaliacao da qualidade de Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) em ovos de Sitotroga cerealella (Lepidoptera: Gelechiidae)



Avaliacao da qualidade de Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) em ovos de Sitotroga cerealella (Lepidoptera: Gelechiidae)



Acta Scientiarum Agronomy 25(2): 485-489



The establishment and maintenance of egg parasitoids in laboratory may be related to the type of alternative host and the number of successive generations. Through this work we studied the change in biological traits of Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) reared for 22 generations in eggs of Sitotroga cerealella (Olivier) (Lepidoptera: Gelechiidae). This parasitoid species was collected from tomato fields, in Ibitirama municipal district, state of Espirito Santo, Brazil, that are 380 m above sea level. The parasitism rate of T. pretiosum ranged from 36.25 [plus or minus] 3.32% to 67.75 [plus or minus] 2.57% with lower values in the generations F0, F3, F5 and F21. The highest parasitism rate took place in generation F7. The viability of T. pretiosum ranged from 89.31 [plus or minus] 8.75% to 100.00 [plus or minus] 0.00% showing the smallest value in generation F12. Adult longevity and biological cycle of T. pretiosum showed decreasing trend because of an increase of generations in laboratory. The sexual ratio of T. pretiosum was not significantly affected, ranging from 0.3 [plus or minus] 0.11% to 0.8 [plus or minus] 0.09, during the experiment.

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