n African Entomology - The bionomics of the egg parasitoid (Gahan) (Hymenoptera : Scelionidae) on Fuller and Hampson (Lepidoptera : Noctuidae) in Kenya

Volume 14, Issue 2
  • ISSN : 1021-3589



The suitability of 1-3-day-old eggs of Fuller and Hampson (Lepidoptera: Noctuidae) to a strain of (Gahan) (Hymenoptera: Scelionidae) collected in mid-altitudes of Kenya was assessed in the laboratory. For both species, age of egg did not affect progeny production but two-day-old eggs yielded more progeny than eggs of the same age. With , development time of increased with age of eggs, while host species had no effect. Neither borer species nor age of eggs significantly affected the sex ratio. Longevity of was greater and total fecundity higher on than . The intrinsic rate of increase and the net reproductive rate were greater with than eggs as host. The values were considerably lower than those reported from the same species in West Africa, indicating that there are differences in strains between regions. Females begun ovipositing on the first day of emergence and the average daily number of eggs laid and the proportion of females decreased with age of the female, on both hosts. The ability of females to accept and develop in and of different ages is an advantage, especially during times of host scarcity, which is common during the dry-season. In a Y- tube experiment no preference for either stemborer species was observed. Similarly, in the field, there was no significant variation in parasitism between and eggs.

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