کارایی حشره‌کش دلتارال و فنیتروتیون در مرگ و میر سن معمولی گندم Eurygasterintegricepsدر شرایط مزرعه‌ای

The Sunn pest is the major insect pest of cereal, especially wheat and barley in Iran. Chemical control is the most effective control method of sunn pest. Most of the time, the efficiency of chemical control isn,t good enough for controlling overwintered adults and nymphs. In this study, the efficiency of the new formulation of Pyrethroid Deltamethrin SC 2.5% (Deltaral®) was investigated against sunn pest in Naghadeh area of West Azarbaijan province. Treatments include: Fenitrothion EC50 with a concentration of 3.33 ml/L, Deltamethrin EC 2.5% with two concentration of 0.3 & 0.7 ml/L and Deltamethrin SC 2.5% with three concentrations of 0.62, 0.5 and 0.42 ml/L. These treatments were evaluated in a randomized complete block design with four replications against overwintered sunn pest adults and nymphs. Data were analyzed and compared using the SAS 9.1 software program. The results showed that Deltamethrin SC 2.5% concentrations of 0.62 ml/L in the group (a), after the three treatments Deltamethrin SC 2.5% with concentration of 0.5 ml/L and Deltamethrin EC 2.5% with two concentration of 0.3 & 0.7 ml/L efficiency between 93.62- 97.66% of respectively in the group (ab). Analysis of variance showed a significant difference among treatments against nymphs of sunn pest. Percent Mortality of the nymphs at 14 days after treatment were: Deltamethrin EC 2.5% with concentration of 0.7 ml/L and Deltamethrin SC 2.5% with concentration of 0.62 ml/L in the group (a), three treatments Deltamethrin SC 2.5% with concentration of 0.5 ml/L, Deltamethrin EC 2.5% with concentration of 0.3 ml/L and Fenitrothion EC 50% with concentration of 3.33 ml/L efficiency between 87.97- 92.21% of respectively in the group (ab). Deltamethrin SC 2.5% (Deltaral®) with concentration of 0.5 ml/L caused more than 80 percent mortality after 14 days from treatment. However, the use of Deltamethrin SC 2.5% can control up to 80 % of the nymphs. It has been recommended that insecticide applications against nymphal instars must begin when the vast majority of the population is in second instar.