تعیین بهترین زمان مبارزه با کرم سیب Cydia pomonella (Lep.: Tortricidae) با تله های فرومونی و درجه حرارت‌های موثر روزانه

Codling moth, Cydia pomonella (Lep.: Tortricidae) is one of the key pests of apple orchards and if not controlled, it will cause severe damage to this crop. Currently, and according to the available information, the most decisive way to control codling moth is to use chemical control. This kind of control will not have a satisfactory result if it is not done at the right time, especially in the case of codling moth, which quickly gets out of the pesticides and penetrates into the fruit. Pheromone traps and calculation of effective daily temperatures (degree day) are the most effective means of estimating and calculating the time to control this pest. In this study, 10 pheromone traps in 5 villages of Salmas city were used and twice a week at regular intervals, the moths were captured and the male of codling moth density was determined. The results of this study showed that this pest has three generations in Salmas region and the appearance of the first moth (Biofix) was in the third decade of April. The peak of flight three consecutive generations was in the second decade of May, the third decade of June and the third decade of July, respectively. According to the results, the best time for chemical control against this pest in the first generation was 4-7 days after the first peak and for the second and third generations 4-5 days after the flight peak. The total effective temperature (DD) in the first generation was 202, the second generation was 643.6 and the third generation was 1115 degrees Celsius. The damage of this pest and the frequency of spraying were significantly reduced by determining the peak of flight and the sum of effective daily temperatures (DD).