Resistance to Callosobruchus maculatus (Coleoptera: Bruchidae) in Selected Cowpea Lines

摘要: Four high-yielding lines of cowpea, Vigna unguiculata (L.) Walp., were evaluated for resistance to four geographic strains the cowpea weevil, Callosobruchus maculatus (F.). Unlike low-yielding accession from which they derived, advanced did not cause high mortality C. larvae within seeds. Resistance was expressed solely as delayed growth. Variation among beetle minor, although Nigerian strain appeared develop faster than others on resistant Development times in all populations decreased slightly or at after six generations selection favoring fastest-developing beetles. Females reared seeds fecund those susceptible The differed each other mostly acceptability oviposition; two rough-seeded combined antibiosis bruchid with nonpreference ovipositing adults.