اثرات ارقام مختلف خیار روی برخی ویژگی‌های زیستی شته جالیز Aphis gossypii Glover (Aphididae) در شرایط آزمایشگاهی

The cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae) is one of the destructive and key pests of cucumber in field and greenhouse conditions. The use of resistant cultivars in integrated pest management programs (IPM) is critical. Therefore, in this study, the life expectancy (ex), percent of immature stages mortality, life table entropy, reproductive periods, and life span of A. gossypii were investigated on seven cucumber cultivars including TN-94-203, Davos II, Negin, Pierro, Dominus (Ps), Royal safa, and Super pretty under constant conditions 27±1ºC, 50±10% RH and a photoperiod of 16:8 h L:D. The first instar nymphs of A. gossypii from a cohort were established on the leaf discs (4×4 cm) inside the Petri dishes (9 cm diameter). The leaf discs were changed every two days. The different life stages were monitored daily until the death of adults. Sixty first-instar nymphs (60 replications) were considered for each cultivar. Based on the results, the percentage of immature stages mortality for the mentioned cultivars was estimated as 5.26, 10, 25, 6.66, 13.33, 33.33, and 6.66, respectively. The highest and lowest mortality values were obtained in Royal safa and TN-94-203, respectively. The life table entropy for the seven cucumber cultivars was estimated as 0.32, 0.43, 0.56, 0.34, 0.42, 0.60, and 0.36, respectively. The value of estimated entropy was more than 0.5 on Royal safa and Negin cultivars, which indicates the type III survival curve. The life expectancy values of different cultivars on the first day of adult emergence were calculated as 17.53, 15.12, 18.07, 13.98, 16.32, 19.42, and 16.55 days, respectively. The lowest and highest pre-reproductive period values were observed on Pierro (0.59 day) and Negin (0.64 day), respectively. The values of the reproductive period, post-reproductive period, and life span were estimated as 9.32, 9.66, and 38.24 days for TN-944-203, 9.22, 7.71, and 22.54 days for Davos II, 11.72, 8.57, and 26.18 days for Negin, 8.55, 6.47, and 20.39 days for Pierro, 10.63, 7.08, and 23.08 days for Dominus (Ps), 10.56, 9.83, and 25.94 days for Royal safa, and 9.97, 7.49, and 23.29 days for Super pretty, respectively. According to the results, Super pretty and Negin are reported to be the most sensitive and resistant cucumber cultivars to the cotton aphid, respectively. The findings of this study can be used in the design and implementation of A. gossypii integrated management programs.