EFFICACY OF SOME INSECTICIDES, OILS AND THEIR MIXTURES FOR THE PROTECTION OF FABA BEAN PLANTS FROM THE LEGUMINOUS APHID, Aphis craccivora KOCH AND DETERMINATION RESIDUES IN PLANT AND SOIL

Abstract

Efficiency of three insecticides, two oils and their mixtures belonging to differentgroups of chemicals, namely lambda-cyhalothrin (Lambda-cyhalothrin 2.5%), acetamprid (Mospilane20%), pymetrozine (Pymetrozine 25%), orange oil (Orange oil 98%) and mineral oil ( Mineral oil KZ95%) on faba bean plants against the leguminous aphid, Aphis craccivora Koch under field andlaboratory conditions was investigated. The LC50 and LC90 values were calculated after 24 hr. posttreatment.The obtained results showed that a wide range of toxicity of the tested pesticides, howeverthe insecticide lambda-cyhalothrin proved itself to be the highest toxic compound after 24hr.,recording LC50 0.098 ppm, on the other hand pymetrozine was the lowest one recording 90.53 ppm.Residual effects of insecticides and their mixtures on A. craccivora under field conditions in 2015season showed that mineral oil (77.08%), acetamprid + mineral oil ( 75.35%) and lambda-cyhalothrin+ mineral oil (53.87%), while in 2016 season, acetamprid + orange oil (27.12%) and lambdacyhalothrin+ orange oil (26.28%) recording the highest residual effects on A. craccivora. The residualeffect of lambda-cyhalothrin in faba bean plants and soil under the environmental conditions of Egyptwas studied. The tested insecticide was sprayed at recommended dose. The treated faba bean plantsand soil were randomly sampled after 2 hr., 1, 3, 7 and 10 days. The tested samples were extracted,cleaned up and analyzed using gas chromatography. The recovery percentages were 75 and 90% in soiland leaves, respectively. The half life values were 0.1 and 0.2 day in leaves and soil samples,respectively.