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Studies on the active form of Callosobruchus maculatus (F.) in Nigeria. III. The dynamics of active female production in Callosobruchus maculatus (F.) (Coleoptera, Bruchidae) in stored cowpeas



Studies on the active form of Callosobruchus maculatus (F.) in Nigeria. III. The dynamics of active female production in Callosobruchus maculatus (F.) (Coleoptera, Bruchidae) in stored cowpeas



Brady, E U; Brower, J H; Hunter, P E; Jay, E G; Lum, P T M; Lund, H O; Mullen, M A; Davis, R Organisers: Proceedings of the First International Working Conference on Stored Product Entomology, Savannah, Georgia, USA, October 7-11, 1974: ; 209-218



In this further study on the production of the 'active' form of the female of Callosobruchus maculatus (F.) on cowpeas (Vigna unguiculata) on Nigeria, three experiments were carried out, firstly, with predetermined numbers of males and females on cowpeas in jars in the laboratory, secondly with naturally infested cowpeas in jute bags in a storehouse, and thirdly with naturally infested cowpeas in jute bags from which insects were sieved out at fortnightly intervals to simulate the removal of observed insects from infested cowpeas by dealers and also the escape of insects. It was concluded that the production of 'active' females in field-infested stored cowpeas increases with the duration of storage, reaching a peak (in relation to the production of normal females) after about 16 weeks of storage; this was not affected when populations were reduced in size by the periodic removal of bruchids in the third experiment. Damage peaks occurred after 10 weeks of storage in the first experiment (in which the artificial infestation was probably heavier than normal) and after 24 and 28 weeks in the last two experiments. Causes of the decline in 'active' female production after 16 weeks are discussed; one reason may be the fact that 'active' females have so far been observed to produce only normal females.

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Accession: 000511910

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