Efficiency of three insecticides, two oils and their mixtures belonging to different
groups of chemicals, namely lambda-cyhalothrin (Lambda-cyhalothrin 2.5%), acetamprid (Mospilane
20%), pymetrozine (Pymetrozine 25%), orange oil (Orange oil 98%) and mineral oil ( Mineral oil KZ
95%) on faba bean plants against the leguminous aphid, Aphis craccivora Koch under field and
laboratory 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, however
the 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 2015
season 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 residual
effect of lambda-cyhalothrin in faba bean plants and soil under the environmental conditions of Egypt
was studied. The tested insecticide was sprayed at recommended dose. The treated faba bean plants
and 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 soil
and leaves, respectively. The half life values were 0.1 and 0.2 day in leaves and soil samples,
respectively.