Influence of cowpea pod maturity on the oviposition choices and larval survival of a bruchid beetle Callosobruchus maculatus

摘要: The 'active' or dispersing morph of Callosobruchus maculatus, a pest stored cowpeas, is presumed to infest cowpea plants in the field prior harvest. In oviposition choice tests, both normal and active females preferred pods that were full-size but still green over younger, smaller older, mature pods. Exposed seeds usually intact all stages, although laid more eggs on than rough-coated one variety. Egg-to-adult survivorship was highest for directly seeds. On high mortality occurred because newly hatched larvae failed penetrate seed after they drilled through pod wall. However, since 20–50% do develop into adults, are susceptible C. maculatus well before dehisce expose preferences may be strongly influenced by surface texture potential sites. RESUME Influence de la maturite des gousses sur le choix du lieu ponte et survie larvaire maculatus La forme ennemi Vigna unguiculata stocke, est suspectee d'infester les dans champs avant recolte. Lors d'essais ponte, toutes femelles, normales actives, ont prefere encore vertes mais ayant atteint leur taille definitive aux plus jeunes ou agees (jaunes) mures. Les graines etaient presque toujours preferees tous stades, quand rugueuses, elles pondaient preference vertes. Le pourcentage eleve d'adultes ete obtenu partir oeufs pondus graines. Avec pontes mures, mortalite elevee se produisait lors penetration gousse. Neanmoins, comme 20 50% donnent adultes, V. d'ětre attaque par bien dehiscence l'exposition L'evolution temporelle proprietes physiques parait l'origine relation complexe entre l'age l'attractivite gousses.