Effect of cowpea genotypes, Vigna unguiculata (L.) Walp., on the development of Callosobruchus maculatus (Fabricius) (Coleoptera : Bruchidae)

Da Costa, N.P.; Boica, A.L.

Neotropical Entomology 33(1): 77-83

2004


ISSN/ISBN: 1519-566X
Accession: 070575677

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Abstract
The objective of this research was to determine the level and types of resistance in 21 cowpea genotypes to the cowpea weevil Callosobruchus maculatus (Fabricius), in a no-choice oviposition test. Tern grams of grains, per each genotype, were infested with five adult insects collected at random, during seven days. Five replicates were used. The following variables were evaluated: number of viable and unviable eggs per recipient, number of insects and percentage of emerged insects, biological cycle from egg to adult, mass of seed consumed and mass of seed consumed by insect. TE 90 170 29F, TE 90 170 76F, CNCX 405 17F and TE 87 108 6G genotypes showed non-preference for feeding and/or antibiosis; the two last genotypes also showed non-preference for oviposition; IPA 206, Canapu and Corujinha cowpea genotypes were susceptible to C. maculatus.