زیست شناسی سوسک چهارلکه ای حبوبات Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae) روی دانه شش رقم ماش

The cowpea weevil, Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae) is one of the important pests of stored legume grains in Iran and many countries of the world. Investigation of resistance status of legume grains to C. maculatus infestation can be helpful in minimizing its severe damage. In this research, we studied the resistance of six green gram cultivars (Sakhavat, Zarbakhsh, Partov, Hendi, Uzbek, and Afghan) to C. maculatus using its life history parameters at 28 ± 1°C, 65 ± 5% relative humidity, and 24 h darkness. After egg laying of adult females, green gram seeds containing one egg were individually transferred to 6 cm Petri dishes and the pre-adult period, the survival percentage of immature individuals, fecundity and longevity of male and female insects on each cultivar were investigated. The results obtained from the life history and life table parameters of the insect were analyzed by age-stage, two-sex method in TWOSEX-MS Chart software. According to obtained results, there was no significant difference in the percentage of survival and the length of the immature stages on different cultivars of green gram. Among the examined cultivars, the fecundity of female weevils on Partov cultivar (69.21 eggs) was lower than other tested cultivars. The longest oviposition period was obtained on Zarbakhsh cultivar (5.33 days) and the shortest on Uzbek cultivar (4.54 days). However, the net reproductive rate (R0), intrinsic rate of population increase (r) and finite rate of population increase (λ) were not significantly different on six cultivars of green gram. According to the findings of the present study, no difference was found in the susceptibility and resistance of the studied green gram cultivars to the cowpea weevil.