بهینه ترین فرمولاسیون حشره‌کش امامکتین بنزوات در کنترل شیمایی کرم خراط Zeuzera pyrina به روش تزریق به تنه

Leopard Moth Borer (LM), Zeuzera pyrina L is a serious pest of wall nut trees in semi dry land regions of Iran. The outbreak of LM is due to climatic changes and drought last years. Chemical and organic control methods at the right time and conditions can be effective in reducing the damage of LM. The chemical control method by trunk injection method can be effective on the pest. For this purpose, walnut trees infected with LM (about 25 years old) were selected in the Hashtgerd area of Karaj on May 31st, 2023. Experiments were carried out in the completely random design with 6 replications, 3 trunk injection treatments and control. In this research, insecticide emamectin benzoate was tested with two formulations. Revive® 100AL with two treatments of 7 and 5 g a.i./tree and Pluto® insecticide (50SG) with 2 gr a.i. /tree, were injected into the trunk of the trees. The walnut trees of control were not treated with any insecticides. In order to the damage of the LM was evaluated at the end of the season, and 10 one-year-old branches were selected from each tree from different directions of the tree, and the number of holes penetrated by LM was counted along one meter of each branch. In addition, the number of active holes in the main trunk was counted. Based on the total number of penetration holes in each tree, the treatments were analyzed by the GLM method, and the efficiency percentage of the treatments was calculated based on the number of active holes in each treatment tree compared to the control. The results showed that the control trees were more infested to LM, so that the average number of borer holes in each tree of the control was 22.8 it was 6.5, 10 and 13.8 holes/tree in Revive® 7, 5 and Pluto®2 respectively. The comparison of the mean efficiency percentage of the treatments showed that Revive® 7 and 5 treatments with 71.75 and 56.5 percent were ranked in the first and second groups, respectively, and Pluto2 insecticide is in the third grope with 39.86 percent. Investigations showed that the most suitable insecticide formulation for trunk injection is the liquid formulation, AL (Any other Liquid). The formulation of water soluble granule, SG was not acceptable for the trunk injection method. The insoluble substances of SG can interfere with the low absorption of the insecticide in tree. And also, it limited applying high concentration of insecticide to the tree. According to the investigation, in infested areas with the LM, for the protection of old and large walnut trees, the use of chemical control by injection method can prevent their rapid destruction.