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Viabilidade e razao sexual de Trichogramma atopovirilia Oatman & Platner, 1983 (Hymenoptera, Trichogrammatidae) sob influencia do hospedeiro Anagasta kuehniella (Zeller, 1879) (Lepidoptera, Pyralidae) em condicoes de laboratorio



Viabilidade e razao sexual de Trichogramma atopovirilia Oatman & Platner, 1983 (Hymenoptera, Trichogrammatidae) sob influencia do hospedeiro Anagasta kuehniella (Zeller, 1879) (Lepidoptera, Pyralidae) em condicoes de laboratorio



Entomologia y Vectoresjulh-ago-set; 11(3): 521-533



It was evaluated the influence of host Anagasta kuehniella (Zeller, 1879) on the viability and sex ratio of Trichogramma atopovirilia Oatman & Platner, 1983. Parasitoids and hosts were created in acclimatized cameras (25[degree][plus or minus]1[degree]C), relative humidity of 70[plus or minus]10% and photophase of 14 hours. Host's eggs were put on blue cardboard (2,5x10cm) and made unfeasible with germicidal lamp (45 minutes). Parasitoids were multiplied in cards of 10x10cm and exposed to the parasitism by 24 hours. 300 females of T. atopovirilia were kept with honey to 25[degree]C and 300 without honey to 29[degree]C/16[degree]C (diurnal/nocturnal). A total of 600 females were submitted the absence of the host during 0-6-12-24-36-48-60-72-84 and 96 hours. Females submitted to the host received cards of 3,5x0,5cm containing 40 eggs made unfeasible by 45 minutes. The viability of the eggs sponged by T. atopovirilia in absence of the host and food, in a constant temperature (25[degree]C) didn't change results in the intervals of time. For the alternate temperature (29[degree]C/16[degree]C), the largest viability taxes were detected after 6 and 12 hours and the smallest one was detected at 0 hour, in that the parasitoid didn't receive host's eggs. When T. atopovirilia were or not fed, in the constant temperature, the results were superior than alternate temperature. In the alternate temperature by which parasitoids were fed, there was superiority in the viability tax. The sex ratio was largest when T. atopovirilia was deprived of food and host, in the constant temperature, during 12 and 24 hours. For the alternated temperature the sex ratio was smallest in the interval of 0 hour in that T. atopovirilia didn't receive eggs of the host.

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