تعیین بهترین زمان مبارزه با پروانه کرم آلو (Grapholita funebrana (Lep.: Tortricidae با تله‌های فرومونی و درجه حرارت‌های موثر روزانه

The plum fruit moth, Grapholita funebrana (Lep.: Tortricidae) is one of the key pests of plum orchards. The main damage of this pest is feeding the larvae from the flesh or pericarp of the fruit. In chemical control of this pest, determining the time of hatching of maximum first instar larvae from eggs is very importance. It is very useful to monitoring of demographic changes of the plum fruit moth and simultaneously measure the degree day in order to determine the best time to control this pest. For this purpose, using pheromone traps as well as sampling of biological stages of pest along with calculating the degree day in three plum orchards in Salmas region during the years 1399-1400 were studied. In this study, 6 pheromone traps were used in 3 villages of Salmas city and twice a week, at regular intervals, the capture moths and the insect density was determined, at the same time, maximum and minimum temperatures were recorded. The results showed that this pest has three generations in Salmas region and the emergence of the first moth (biofix) in the second decade of April. The peak of flight and the total effective temperatures (degree day) during three consecutive generations were recorded: first decade of May - first generation with 262.25, the second decade of June - the second generation with 490.6 and the second decade of July - the third generation with 1035 degrees/day, respectively. By determining the peak of flight and the sum of effective daily temperatures (DD), the damage of this pest and the frequency of pesticides spraying were significantly reduced.