Flight curves of codling moth Cydia pomonella L. based on accumulative temperatures in As-Suwayda Governorate, Syria

Abstract

The codling moth Cydia pomonella L. (Lepidoptera: Tortricidae) is the most serious pest of apple orchards worldwide and a significant pest of other pome fruits and walnuts. The pest is very adaptable to different climatic conditions. The results in As-Suwayda Research Center area indicated that the insect has two complete generations in 2019. Longevity of the first, and second generations was (70, 54) days, respectively with their accumulative temperatures of (725.7, 755.8) degree-days (dd), from the first, and second bio fix , respectively and has three generations in (2020-2021). Longevity of the first, second and third generations was (75, 39, 39) days, and (60, 54, 48) days, respectively with their accumulative temperatures of (656.2, 546.4, 412.8) degrees-day and (553.2, 695.2, 578.2) degrees-days, from first, second and third bio fix, respectively in (2020-2021). The effect of high temperature and accumulative temperature on the number of generations of the insect was noticed, where the number of generations of the insect has increased than it was before.