Nutritional indices parameters of large white butterfly Pieris brassicae (Lepidoptera: Pieridae) on different cabbage crops

摘要

The effects of four cabbage crops?including:?white cabbage (Brassica oleracea?var?.?capitata?f.?Alba), cauliflower (Brassica oleracea?var. botrytis),?red cabbage (Brassica oleracea?var?. Viridis??f. Rubra) and broccoli (Brassica oleracea?var. italica) on nutritional indices of?Pieris brassicae?(Lepidoptera: Pieridae) were determined at 26 ± 1°C, 65 ± 5% RH and a photoperiod of 16:8 (L:D) h. Nutritional indices of third??to fifth larval instars indicated that,?B. oleracea.?Var. Capitata?is more nutritionally rich food and even small amount of this food could successfully support maximum value of efficiency of conversion of ingested food (ECI) (14.764 ± 0.500%) and efficiency of conversion of digested food (ECD) (14.713 ± 0.600%) among the Brassicae spices. The lowest values of these parameters were found on?B. O. Var. Botrytis?spices. The results indicate that,?B. O. Var. Capitata?spices??was the most nutritive and as a partially susceptible varieties among?cabbage crops, in due to the highest value of?FP?(0.055 ± .008 g)?ECI?and?ECD, in conversely,?B. O. Var. Botrytis?variety were recorded as partially resistant and the least nutritive for?P. brassicae, this is due to the fact that the least value of relative growth rate?(RGR),?ECI, ECD?and?FP?were recorded.