UZUNDERE (ERZURUM) İLÇESİNDE CEVİZDE (Juglans regia L.) ZARARLI ELMA İÇKURDU (Cydia pomonella (L.) (LEPIDOPTERA: TORTRICIDAE))’NUN POPÜLASYON GELİŞİMİ VE BULAŞIKLIK ORANININ BELİRLENMESİ

MEETCON-PRIME II. INTERNATIONAL SCIENTIFIC STUDIES CONGRESS, Kayseri, Türkiye, 20 - 23 Ekim 2026, ss.1-8, (Tam Metin Bildiri)

This study aimed to determine the population dynamics and fruit infestation rate of the codling

moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), in walnut (Juglans regia L.) orchards

in the Uzundere district of Erzurum Province, Türkiye. The study was conducted in 2023 and

- -2). Pheromone-baited

delta traps were checked weekly from 15 May to 15 September. Effective accumulated

temperature (EAT) was calculated in degree-days (DD) with a lower developmental threshold

of 10 °C. At harvest, 400 fruits (20 fruits from each of 20 trees) were examined per location.

Temperature catch relationships were tested with Pearson correlation and the two years were

compared with a paired-samples t-test. C. pomonella completed two generations per year in

Uzundere, with adult flight peaks around 30 June (first flight) and 25 August (second flight).

The mean catch per trap at the second flight peak was 38.75 adults in 2023 and 27.25 adults in

2024. Fruit infestation rates ranged from 6.00% to 9.00% in 2023 and from 3.50% to 6.75% in

2024. Weekly mean temperature was strongly and positively correlated with trap catches at all

locations (r = 0.721 0.806; p < 0.0001), and catches in 2023 were significantly higher than in

2024 (p < 0.001). Infestation rates exceeded the 2% control threshold at all locations in both

years, supporting an EAT-timed control program in the region.