ارزیابی مقاومت ارقام مختلف توت فرنگی نسبت به کنه Phytonemus pallidus fragariae

There are various insects and mites that attack and damage strawberry. The Strawberry mite, Phytonemus pallidus fragariae, is an important pest of greenhouse and field grown strawberries. Feeding by this mite weakens the plant and can cause reductions in yield. In this study, we evaluated the life history and demographic parameters of P. pallidus fragariae on two conventional varieties including Camarosa and Selva at a constant temperature of at 15 ± 0.5°C, 80-70 % RH and a photoperiod of 16:8 (L:D) hour. To initiate experiments, 50 eggs were used as a fertility and life table with a follow-up cohort until the death of the last individual. The data were analyzed based on the age-stage, two-sex life table analysis. Female preadult development was faster on Selva and slower on Camarosa (7.90 vs. 8.30 days). Also, the oviposition period was longer on Selva and shorter on Camarosa (8.30 vs. 8.00 days). The net reproductive rate varied from 7.70 to 8.14 offspring on two varieties. Life table provides most comprehensive description on the survival, stage differentiation and reproduction of the population. Although some variations observed in the life table parameters of P. pallidus fragariae, no significant differences were observed on two different cultivars, research on these two strawberry cultivars can be used to improve our understanding of the population dynamics of the pest and thereby develop effective pest management programs against P. pallidus fragariae.The use of resistant and/or partial-resistant variety such as introduced variety in the present study may be considered as one of the most important part of an IPM strategy.