پارامترهای جدول زیستی شب‌پره‌ پشت‌الماسی Plutella xylostella (Lep: Plutellidae) روی‌هشت رقم کلزا در شرایط آزمایشگاهی

Plutella xylostella (Linnaeus) (Lep: Plutellidae) is one of the destructive pest of Cruciferous plant in the world and Iran. The larvae are able to damage various aerial part of the host plant. Investigation on host plant resistance is one of the basic methods in integrated pest management. In this study, the effect of eight canola cultivars (Jolius, Zarfam, Hyula50, Hydromel, R15, 1009, RGS0003 and Opera) were studied on growth and fecundity of Diamond Back Moth in the laboratory at 25±1°c, relative humidity of 50±5% and light condition of 16 hours of light and 8 hours of darkness. The host plant leaves were placed in spawning cage containing 100 pairs of male and female moth for prepare the egg cohort. Then the leaves were removed from the cage after ten hours and the eggs were used for test. Data were analyzed based on the age-stage, two-sex life-table theory. Survival rate, intrinsic rate of increase r, net reproductive rate (R0), mean generation time (T) and finite rate of increase (λ) on each host plan cultivars were calculated. The results showed that the studied parameters on host plants were significantly different. The highest r values were 0.2217 and 0.2209 day-1 on 1009 and Hydromel cultivars and the lowest intrinsic rate of increase were 0.2018, 0.1923, and 0.1921 day-1 on Hyula50, RGS0003 and Zarfam cultivars respectively. The lowest R0 was obtained 46.9 on RGS0003 cultivar and the highest value was obtained 79 offspring/female/individual on 1009 cultivar. The lowest and highest development time was 15.36, 15.51 and 15.76 day on Hydromel, Zarfam and RGS0003 cultivars, and 20.22 day on R15 cultivar respectively. The lowest finite rate (λ) was obtained on RGS0003 cultivar 1.211 day-1 and the highest on 1009 cultivar 1.258 day-1. The lowest (T) was obtained 20.095 and 20.078 day on Zarfam and RGS0003 respectively and the highest generation time was 19.029 day on 1009 cultivar. The results demonstrated that Hyula50, RGS0003 and Zarfam cultivars were identified as resistant. It is hoped that these results will be used in integrated pest management of Diamond back moth on canola cultivar.