Effect of wild grasses planted as border rows on stemborer infestations in maize in Uganda)

Publication Type

Journal Article

Journal Name

Environmental Entomology

Publication Date

12-1-1990

Abstract

Parasitism rates were analyzed for Helicoverpa armigera feeding on four different crops in western Tanzania (1982-1985), during a period in which all crops were inhabited by the insect. The major parasitoid species differed markedly in their crop associations, with Palexorista laxa, Apanteles diparopsidis, and Chelonus curvimaculatus strongly associated with sorghum, Cardiochiles spp. Mostly associated with cotton, and Charops sp., mostly associated with the weed-crop Cleome sp. For P. Laxa, Cardiochiles spp., and Charops sp., the crop effect explained about 50% of the variance in parasitism among crop, month, and year. This was less for A. Diparopsidis and Chelonus curvimaculatus, which were erratic in their occurrence from year to year. Implications of parasitoid-crop associations for biological control of H. Armigera are discussed.

Keywords

Helicoverpa armigera, Insecta, Parasitism, Parasitoid-crop associations

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