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Studies on the efficacy of some biorational insecticides against the banana weevil cosmopolites sordidus (Germar) (Coleoptera: Curculionidae)

W Tinznara
C Nankinga
I Kashaija
W Tashemereirwe


Biorat!onal insecticides obtained from tobacco, ash , urine, pepper and a concoction (mixture) were tested for their effect on adult weevil mortality, repellence and oviposition. Weevil oviposition on corms treated with  tobacco, urine and the concoction was significantly reduced corn pared to oviposition on those treated with ash  and pepper and on control corms. Similarly, the mean number of weevils settling on corms treated with the concoction compared to controls was statistically different for all the periods of the study. The mean number of weevils settling on corms treated with concoctions stored for four weeks was significantly lower than to those settling on corms lreatcd with concoctions used either immediately or stored for one to two weeks. The concoction showed limited residual activity.

Key words: Banana weevil, biorational insecticide, concoction, Cosmopolites sordidus, residual activity, toxicity.

Journal Identifiers

eISSN: 2410-6909
print ISSN: 1026-0919