غربالگری مقاومت برخی از ارقام کلزا به شب‌پره پشت الماسی کلم Plutella xylostella (Lep: Plutellidae) در شرایط آزمایشگاهی

Plutella xylostella (L.) is one of the most important pests of Brassica napus L. in the world and Iran. The larvae cause severe damage by feeding on foliage and fruits of the host plant. Investigation on host plant resistance is one of the basic methods in integrated pest management. In this research, a colony of P. xylostella was collected from the research fields of Mohaghegh Ardabili University. Twenty Cultivars of B. napus contain Zarfam, RGS003, Okapi, Opera, Hyola405, Nafis, Agamax, Nepton, Jolius, Nataly, 1008, Xpower, Hydromel, R15, Zafar, KS7, Safar, Hyola 50, 1009, and Nima were planted in pots with 12 cm and at the condition of growth chamber with a temperature of 25 ± 1°C, 50 ± 5% RH and 16L:8D. The experiment was conducted in a completely randomized design with 30 replicates of egg per cultivar. Larval development time was recorded every 24 hours and finally, pupal weight was recorded. The Relative resistance of cultivar (Rc) was calculated by wearing the (2003) method by using SPSS 0.16. The highest pupal weight was obtained for Nafis, Nima, and Hyula420 cultivars, and the highest larval development time was obtained for Jolius, 1008, Zarfam, and 1009 cultivars. The shortest larval development time was calculated for Hydromel and Opera cultivars. The results showed that 1009, R15, Jolius, Hayula 50, Zarfam, and 1008 had the highest resistance for P. xylostella with values 0.2706, 0.2705, 0.2705, 0.2701, 0.2700, and 0.2700 respectively. Also, Hydromel and Opera showed the lowest relative resistance to the insect with 8.83 and 9.12 value respectively. These results can use for integrated pest management (IPM) programmers in the control population P. xylostella in farmland.