Effect of Certain Bio and Chemical Insecticide on Cotton Leafworm, Spodoptera Littoralis (Boisd.) and Some Associated Predators Under Field Condition

Abstract

Present work was carried out at Zagazig district, Sharkia Governorate during 2008and2009seasons to evaluate the effect of some bioinsecticides, Jojoba oil, Dimilin and Dursban on Spodoptera littoralis and some accompanied Predators under field condition. The results indicated that the initial effect of the tested compounds, (expressed as the rate of reduction in the percent infestation) recorded (18.7, 23.61, 23.6, and 17.9% in the first season. ( 2008), (16.88, 19.53, 19.9 and 17% in the second one ( 2009) for Biorinza, Biovar, Protecto and Jojoba oil, respectively. It is obvious that Biovar was the most potent compound in both seasons. Also, results indicate that the initial effect of tested IGR (Dimilin) induced reduction in the rate of S. littoralis infestation, as it recorded (77.295%) reduction, in 2008