و حشره كش ايميداكلپريد ERETMOCERUS MUNDUS بررسي امكان كنترل تلفيقي سفيد بالك پنبه با استفاده از زنبور پارازيتوييد

Study on the possibility of integrated control of Bemisia tabaci (Horn.: Aleyrodidae) by Eretmocerus mundus (Hym.: Aphelinidae)and imidacloprid

The study of imidacloprid efficacy on the sweetpotato whitefly, Bemisia whew/ Gennadius, (Homoptera: Aleyrodidae) and parasitoid wasp, Eretmocerus.+ mundus Mercer (Aphelinidae) was conducted in greenhouse conditions, on Lantana Camara L., under randomized complete blocks design with 5 treatments including, concentrations of 0.02, 0.04, 0.08. and 0.16 g/litre of insecticide, and control (water). The effect of insecticide on the different aleyrodids life stages was studied in short term (7 days), and long term (120 days) after treatment. Insecticide short term efficacy on the mean percentage released adults mortality, mean rate of oviposition, mean percentage eggs hatching, mean percentage nymphal instars mortality, and mean percentage adults eclusion of B. ʹabaci was significantly different to control at P G 0.t)1. The concentrations of 0.02, and (1.04 g/litre of insecticide caused significant difference in final aleyrodids population density. but that of the 0.08 and 0.16 eradicated it. Insecticide long term efficacy on aleyrodids had significant difference in all treatments, and the results was similar to short term one. Longevity of emerged adults in different concentrations was significantly shorter than controls. Therefore insecticidal efficacy of imidacloprid is saved in the plant tissues, at least for 120 days after treatment. The effect of insecticide was studied on mean percentage parasitoid mortality, mean percentage parasitism, mean percentage adults eclusion, and mean longevity of emerged parasitoid. There was positive correlation between the insecticide concentration, and its effect on parasitoid life stages. Of the studied insecticide concentrations, the 0.02 g/litre was efficient on the aleyrodids, life stages, but has no effect on the mean percentage mortality, mean percentage parasitism, and mean longevity of the parasitoid; therefore it is the most effective concentration on B. tabaci, and the safest one for the parasitoid. On the results of this investigation, intergrating application of 0.02 g/litre of imidacloprid with E. mundus is suggested on B. tabaci tinder the Integrated Pest Management (IPM) programs.