Survey and evaluation of some hymenopterous parasites of Asia corn borer Ostrinia furnacalis (Guenee) (Lepidoptera: Pyralidae) with emphasis on the bionomics of Tetrastichus ayyari Rohwer (Hymenoptera: Eulophidae)
1987
Lorenzana, O.J.
Survey, monitoring and evaluation of common hymenopterous parasites of corn borer and the bionomics of Tetrastichus ayyari were conducted. About seven species of hymenopterous parasites attacked the different stages of corn borer, Ostrinia furnacalis (Guenee), at College, Laguna [Philippines], namely: Trichogramma chilotraea Nagaraja and Nagarkatti, T. evanescens Westwood, T. chilosis Ishii (Trichogrammatidae); Chelous communis Baber (Braconidae); Xanthopimpla stemmator (Thunberg), Trichoma sp. (Ichneumonidae); and Brachymeria obscurata (Wlk) (chalcididae). Tetrastichus ayyari Rohwer (Eulophidae) was recovered at Nueva Vizcaya [Philippines] and it attacked the larval and pupal stage of corn borer. The most abundant parasites in both cropping seasons were the egg parasites, Trichogramma spp., followed by C. communis, an egg-larval parasite and X. stemmator, a larval-pupal parasite. T. chilotraea and T. evanescens were effective against corn borer in both field and laboratory conditions. Parasitism rate was high at the release point up to 4 meters away. Likewise egg masses of corn plants were parasitized more by Trichogramma species than the upper 1/3 parts. Courting-mating, ovipositional behavior, mode of reproduction, fecundity, reproductive potential and longevity of adult T. ayyari were observed. High rate of parasitism was observed on one and two-day old pupae at higher parasite to host ratio under laboratory condition. Mass release of T. ayyari yielded low parasitism rates on corn borer pupae.
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