بررسی تاثیر آفتکش‌های ارگانیک روی آگرو(ماترین) و بیولوژیک Bacillus thuringiensis (بایولپ) درکنترل کرم برگخوار پاییزه

Spodoptera frugiperda Smith (Lepidoptera, Noctuidae) is one of the most important pests of crops, which has many hosts. As a result of the feeding of this pest, a lot of damage will be done to crops and it causes the quantitative and qualitative reduction of crops. Currently, insecticides are used to control this pest, which can have environmental effects over time due to the insect's resistance to them. The efficacy of two insecticides, the organic insecticide based on plants (Rui Agro) and Bacillus thuringiensis subsp. kurstak in the control of S. frugiperda in laboratory conditions was investigated. This research was conducted in the form of a completely randomized design with five treatments, in three replications and each replication with 10 larvae of the second age by spraying on the plant. In the bioassay test, corn leaves were treated with three concentrations of biological pesticide B. thuringiensis with three concentrations including 0.5, 1, and 1.5 per thousand. Rui Agro insecticide was used with a dose of 2 per thousand. The results of laboratory bioassay after eight days by recording the daily mortality rate and using different concentrations of compounds on the second instar larvae of the S. frugiperda showed that the mortality rate also increases significantly with the increase of different concentrations of the biological compound (BT) (df=2.6, F=40.44, P > 0.005).. The highest mortality rate was observed with a concentration of 1.5 per thousand BT, 93.3%±0.33 and the lowest mortality rate of this insecticide was 26.6%±0.66 with a concentration of 0.5 per thousand. Furthermore, the death rate was determined to be 2 per thousand in Rui Agro 80%±0.57.According to the results of this research, it is suggested to conduct field studies using BT biological insecticide to investigate its effect on the S. frugiperda.