Host preference studies on Trichogramma sp. nr. mwanzai Schulten and Feijen (Hymenoptera:Trichogrammatidae) in Kenya
1990
Guang, L.Q. | Oloo, G.W.
Host preference studies were conducted on Trichogramma sp. nr. mwanzai at 25 +/- 2 degrees C, 40-60% r.h. in the laboratory, using eggs of C. partellus, B. fusca, E. saccharina, S. cerealella and B. mori in choice and no-choice tests. Adults emerged within 9-10 days; ca. 70% parasitoids of both sexes emerged and mated between 0800-1000 hr, with a peak at 0800 hr. There was no significant difference (P < 0.05) between the number of progeny per female from eggs of C. partellus (33.9 +/- 9.2), B. fusca (30.1 +/- 4.5) and S. cerealella (30.9 +/- 9.9) in no-choice tests, but progeny production was significantly less from E. saccharina and no parasitoid emerged from B. mori. In host age selection tests on C. partellus, there was no significant difference (P < 0.05) between the number of offspring per female from eggs of age groups 0-2 days; offspring of day 3 were significantly less, and no parasitoid emerged from day 4 eggs. Up to 4 (mean, 1.9 +/- 0.6) adults emerged from a single egg of C. partellus. Since mass rearing technology exists for C. partellus and is available at ICIPE, it was concluded that day 0-2 eggs of this borer are more suitable for mass production of T. sp. nr. mwanzai.
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