Lethal effect of three synthetic insecticides and two commerical botanical extracts on the Sunn pest, Eurygaster integriceps Puton under the field and laboratory conditions

The Sunn pest, Eurygaster integriceps Puton, is the most important pests of wheat and barley fields in Iran. Currently chemical control is the most common control measure of this pest. In this study, the lethal effects of three synthetic compounds, deltamethrin똘驲娩긧 (1000 ml/ha), lambda-cyhalothrin (75 ml/ha), deltamethrin (300 ml/ha) were compared with two commerical botanical extracts, Palizin® SL 65% and Sirinol® (1000 ml/ha) under the field and laboratory conditions. In the field study, a complete randomized block design with 4 replications was used on 3rd nymphal stages and overwintering adults in 2014 and 2015. The results showed that deltamethrin똘驲娩긧 and lambda-cyhalothrin with 100 and 90.1% mortality rates on adults were most efficient insecticides, respectively. Also, lambda-cyhalothrin and deltamethrin똘驲娩긧 with 100 and 96.38% mortality rates were most efficient insecticides on nymphal stages of Sunn pest, respectively. Contact bioassay in the laboratory indicated that the insecticide deltamethrin with LC50 1.35 and Sirinol® with LC50 of 2155 micro liter per liter were the most and least effective insecticides, respectively. Studies in both field and laboratory showed that; botanical extracts had less lethal effect compared with synthetic insecticides on the Sunn pest.