Effects of UV-Light, Temperature and Storage on the Stability and Biological Effectiveness of Some Insecticides

作者：Mahmoud S. Soliman · 发表于：Journal of Plant Protection Research · 年份：2012 · DOI：10.2478/v10045-012-0044-1 · 被引用次数：19 · 研究领域：Insect Pest Control Strategies、Insect and Pesticide Research、Pesticide Residue Analysis and Safety

Effects of UV-Light, Temperature and Storage on the Stability and Biological Effectiveness of Some Insecticides The degradation and biological effectiveness of five insecticides, ES-Fenvalerate (Soumi Gold), pirimicarb (Afox), imidacloprid (Emax), buprofenzin (Ablloud) and methomyl (Methiolate) in their aqueous preparations and emulsifiable concentrates, on immature stages of whitefly insectBemisia tabaci. when exposed to UV-light, two different temperatures and daylight and dark storage after exposure intervals was studied. The results indicated the degradation rates of the five tested insecticides varied according to the chemical structure, time of exposure and wavelength of UV-rays used. Of all the five insecticides, methomyl was the most affected by UV-rays. Losses of ES-Fenvalerate, pirimicarb, imidacloprid, buprofenzin and methomyl within this period were 11.30, 14.80, 29.03, 31.83 and 39%, respectively after one hour to UV-ray exposure. A significant increase in LC50value was obtained when ES-Fenvalerate in aqueous preparation was exposed to UV-light for 6 hr. The LC50values and their confidence ranges in aqueous preparations and emulsifiable concentrates were 107.5 ppm (51.7-199.2) and 93.10 ppm (48.3-150.4). The residual level of Fenvalerate, pirimicarb, imidacloprid, buprofenzin and methomyl were 13.52, 17.54 ppm; 12.67, 15.87 ppm; 11.78, 16.47 ppm; 11.38, 14.73 ppm; and 11.36, 11.83 ppm for two days exposed to daylight and dark storage. Insecticides could be arrang...