بررسی کارایی حشره کش‌های جدید در کنترل برگخوار چغندرقندSpodoptera exigua Hubner (Lep.: Noctuidae)

Beet armyworm, Spodoptera exigua Hubner (Lep.: Noctuidae) is considered as one of the most important pest of sugar beet. Farmers have to use chemical control during the growing season to control the pest damages. The use of new pesticides while avoiding their resistance is important for plant pests control. In this project the efficacy of two new insecticides, Vild PS, SC 350 (with Active ingredient thiodicarb) and Empayer EC 2.3% (with Active ingredient emamectin benzoate) were compared to other insecticides in sugar beet field of Bukan city, West Azarbaijan province. The treatments were including Vild ps® (SC35%) in concentrations of 1700 and 1400 ml/hec, Empayer® (EC2.3%) 500 and 400 ml/hec, Larvin® (DF800%) 1 kg/hec and Avant (SC15%) 250 ml/hec. The evaluations were based on the number of alive larvae that recorded one day before and 3, 7 and 14 days after spraying. The percentage of treatment efficiency was calculated by the Henderson-Tilton method. Statistical analysis was done using GLM method and SAS soft wares with randomized complete block design. The results showed that the highest mortality was related to high concentrations of two new insecticides. While the efficacy of Vild ps in concentration of 1700 ml/hec and Empayer in concentration of 500 ml/hec, 14 days after spraying were 94.01 ± 1.05 and 92.45± 0.7% respectively. However, two insecticides, with 400 and 1400 ml/hect respectively, results an acceptable mortalities in the pest population (more than 80%). Accordingly these two insecticides with those dosage could be recommended for chemical control the beet armyworms in sugar beet fileds in West Azarbaijan province.