بررسی دوره حضور و فعالیت پروانه جوانه خوار بلوط Tortrix viridana L. بااستفاده از تله های فرومونی در استان چهارمحال وبختیاری، منطقه مشایخ

The area of forests of Chaharmahal va Bakhtiari province is about 307 thousand hectares, that 95% of them covered by oak trees. The oak leaf roller moth Tortrix viridana L. (Lep.: Tortricidae) is one of the most important pests of oak that causes a lot of damage to the trees of the region every year by feeding the larvae from the buds and leaves. Using the pheromone traps is one of the best ways to monitoring this pest. For this purpose, during 2019 and 2020, the distribution and presence of pest in oak forests of Mashayekh region of the province were studied and 30 pheromone traps, in 6 locations with a distance of about 5 km from each other, with different heights were selected. In each station, 5 traps of Raha Andish Kavan Co. with sex pheromone made by Faravardehaye Tabiat Doost Nikan Co. with a distance of 50 meters from each other at a height of 2 to 3 meters, in the north-south direction in the shade of trees were installed. Trapping operations in both years started on May 4 and the traps were collected on July 5. The first prey in 2019 on May 10 and in 2020 on May 23 was seen; and the last prey in 2019 on 21 June and in 2020 on 22 June took place. Traps and pheromones were replaced monthly. Survey of the pest presence period showed that this pest was present in all areas under study and the highest population density of the pest was in Darreh Eshgh area with an average of 87, moth per trap. Thus, the period of presence of adult insects was a period of 30 to 40 days and after that mating and laying occurred.