Weevil Infestation of Kolanuts in the field and Markets in Western Nigeria


ABSTRACT: The patterns and levels of weevil infestation of kola nuts offered for sale ill three major
kola markets, Ile-Ife, Ogunmakin and Mamu, in Western Nigeria were investigated. The populations of the weevils in market and field samples of kola nuts were also assessed. Infestation of nuts was generally high (41-52 percent) during the off-season of kola (June-August or September) when the field population of the weevils was very low. Both the market and field samples of kola nuts gave two peaks of weevil population; a smaller peak in April-May and a main peak in November-January. The two population peaks are related to the light and main harvest season of kola in Southern Nigeria.

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