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Effect of Cassava Varieties on Oviposition and Development of Larger Grain Borer-Prostephanus Truncatus Horn (Coleoptera: Bostrichidae)

By Animal Research International, University Of Nigeria, Nsukka.

Summary

ABSTRACT
The influence of cassava varieties on the developmental biology of Prostephanus truncatus (Horn) was investigated. This beetle was reared on flour varieties of cassava, namely: Danwari, Nwugo, Aburu-Asua and Ant -Ota. More eggs were la d in Danwari (132.0 i i+ 6.1 egg) than in other cassava variety. The least number of eggs laid was in Nwugo (118.3+-4.5) in No-choice experiment. In Freechoice test, the highest number of eggs was recorded in Aburu-Asua (64.0 + lowest (41.6 + . . 1 7 eggs) and the 3 1 eggs) on Anti-Ota. The average total developmental period in, Aburu-Asua, Nwugo, Danwari and Ant -Ota were 32.5 i+ 0.4, 30.6 + 0.2, 28.5 + 0.1 and 34.7 + 0.1 days respectively. The low oviposition preference for Nwugo was attributed to the presence of oviposition deterrents in this variety, which might have protected it against the beetle attack.
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