The susceptibility of faba bean and other seed legumes to infestation by Bruchidius incarnatus (BOH.) and Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) [Vicia faba]
1989
Shazali, M.E.H. (Agricultural Research Corporation, Khartoum North (Sudan). Shambat Research Station)
Oviposition and development of Bruchidius incarnatus (Boh.) and Callosobruchus maculatus (F.) on eight seed legumes were studied in a thermostatically controlled Kotterman cooled incubator at 30 deg C and 70% relative humidity. The number of eggs laid on the different seeds varied significantly (P0.01), although the same. B. incarnatus oviposited its highest number of eggs on faba bean (Vicia faba L.), whereas C. maculatus laid its maximum number of eggs on pigeon pea (Cajanus cajan L.). The percentage eggs hatched was significantly (P0.05) affected by host seeds. Percentage of adult emergence was not significantly different between the two species of insects. However, the effect of host and the interaction between host and insect species were highly significant (P0.001). Chickpea (Cicer arietinum L.) was the most susceptible host to both insects, whereas cowpea (Vigna unguiculata L.) and garden pea (Pisum sativum L.) were the most resistant to B. incarnatus and C. maculatus, respectively. The insects completely failed to develop in either lupin (Lupinus termis L.) or in haricot bean (Phaseolus vulgaris L.). There was evidence that this reaction may be related to seed coat hardness in haricot bean and to the seed chemical composition in lupin
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