Effect of aqueous Extract of Some Plants on Mortality of the lesser grain borer, Rhyzopertha dominica (F.) (Coleoptera: Bostrichidae)

Abstract

Laboratory experiments were conducted at the Department of Plant Protection, College of Agricultural Studies, Sudan University of Science and Technology. This study aimed to manege of lesser grain borer Rhyzopertha dominica using two botanicals as the natural products in relative to the insecticides. Were used three concentrations of each plant extract 30%, 20% and 10% plus untreated control. The results revealed that the two highest concentrations of leaves powder aqueous extract of Usher used in this study (30% and 20%) gave the highest mortality percentage of 80%,66.6% respectively followed by Cafur 30 % which gave 63.3% mortality after 72 hours. The concentrations which kill 50% of population (LC50 ) of Cafur Extract was 157.177 after 24 hours, 109.526 after 48 hours and 94.425 after 72 hours. The concentrations which kill 50% of population (LC50 ) of Usher Extract was 22.842 after 24 hour, 18.187 after 48 hour and 11.926 after 72 hours. The above results showed that Usher Extract gave the lowest LC50 11.926 after 72 hour. Therefore Usher extract could be considered as promising and safe alternative for control of lesser grain borer in stores using contact application methods.