Abstract
1 Summary The present study investigated the effects of volatile fractions of Citrus limon (Linnaeus, 1753) and Citrus reticulata Blanco, 1837 (Rutaceae) peel essential oils on the cowpea adult bruchid, Callosobruchus maculatus (Fabricius, 1775) (Coleoptera: Bruchidae). The oils were extracted from the fruit peels using water steam distillation. The results indicated that the citrus peel oils had high fumigant activity against adult beetles. The mortality of 1 to 2-day-old adults increased with increasing oil concentration or exposure time. The oil of C. reticulata was significantly more toxic than that of C. limon based on both 24 h LC50 (33 and 45 µl L -1 , respectively) and 24 h LC90 (75 and 99 µl L -1 , respectively) estimates. The results suggested that citrus peel oils can be used as potential control measure against cowpea beetles.
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