The Efficacy of Methyl Alcohol Extracts of Albizzia lebbeck (L.) Benth Seeds , Melia azedarach L. Fruits and their mixture in Comparisom with Actellic Insecticide on Eggs and adult emergence of cowpea weevil Callosobruchus maculatus (Fab.)(Coleoptera:Bruc

Abstract

This study has carried out in laboratory to reveal the efficacy of methyl alcohol extract of Albizzia lebbeck (L.) Benth seeds and Melia azedarach L. fruits , in addition to their mixtures ( 1:1) , which is compared with the insecticide Actellic 50% EC., on Eggs and adult emergence of cowpea weevil , Callosobruchus maculatus (Fab.) under laboratory conditions of 30+ 2 C. and 60+5% relative humidity.Results have shown that there is significant differences in percentages of egg hatching of 1 , 2 and 3 days old which is treated with concentrations of 2,4,6,8,10% of methyl alcohol extract of Albizzia lebbeck seeds and Melia azedarach fruits ; the concentrations of 1,2 and 3% of the mixture of both and the concentrations of 0.05 , 0.075 % of the insecticide. There is a converse relationship between egg hatching and concentrations . Eggs of 1 day old are more resistant than other ages , since the highest egg hatching , 87.5% and 72.2% for Albizzia lebbeck seeds and Melia azedarach fruits respectively occur with 2% concentration compared with control which is 98.00 and 96.00% for both of them respectively. While Adult emergence has reached 80.36 and 75.6 % compared with control which is 94.00 and 100.00% for both of them respectively for the same age and concentration. The lowest hatching and emergence percentages are 52.5 and 69.79% of Albizzia lebbeck seeds extract at 6% concentration and 17.5 , 72.22 % of Melia azedarach fruits extracts at 8% concentration . No egg hatching occurs at 8% concentration of Albizzia lebbeck and 10% of Melia azedarach extracts for all ages .The highest egg hatching of 1day eggs old and adult emergence is 45.49 and 87.50 % at 1% concentration for mixed extraction compared with control which is 100.0 and 96.67 % . The lowest egg hatching is 5.00 % at 3% concentration and the lowest adult emergence 25.0% at 2% concentration compared with control which is 100.0 and 93.33% for eggs of 3 days old ; and there is no adult emerged at 3% for all ages . The highest egg hatching of 55% occurs at 0.05 concentration of actellic for 1 day old compared with control treatment which is 100.0% , and there is no hatching for the other ages and concentrations.