تأثیر سه رقم گیاه خیار و دو نوع سامانه کشت خاکی و هیدروپونیک روی واکنش تابعی بالتوری سبز، Stephens Chrysoperla carnea نسبت به شته جالیز Aphis gossypii Glover

Hydroponics is a technique of growing plants using a water-based nutrient solution rather than soil. In this type of cultivation system, the growing media can include vermiculite, cocopeat, or perlite. The type of cultivation substrate and plant cultivar can affect the behavioral characteristics of natural enemies. In this study, the effect of three cucumber cultivars (Vihan, Shahab, and Saba) and two types of cultivation systems (soil and hydroponic) was investigated separately on the functional response of 3rd instar larvae of Chrysoperla carnea Stephens to different densities (2, 4, 8, 16, 32, 64 and 128) of 4th instar nymphs of Aphis gossypii Glover. Third instar larvae were starved for 16 h before the experiment and then placed in 9-cm Petri dishes with different densities of 4th instar nymphs of A. gossypii on the fourth terminal leaf of 8-leaf cucumber plant. The experiment was carried out for 24 h at 25±2 ̊C, 65±5 RH, and 16:8 (L: D) h. The logistic regression analyses revealed that the functional response of 3rd instar larvae of C. carnea to A. gossypii on different cucumber cultivars in both cultivation systems was type II. According to the results, the highest attack rate was estimated for the predator on Vihan and Shahab cultivars (0.1087 and 0.1074 h-1, respectively). The handling times (Th) of predator varied from 0.1310 to 0.1665 h on different treatments. The results revealed that the type of cultivation system and plant cultivar can affect the functional response parameters of 3rd larval instar of C. carnea. However, understanding more details of the effects of the plant cultivation system and plant cultivar in cucumber -A. gossypii -C. carnea interactions requires more studies.