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Brassicaceae family produce a specific secondary metabolites, so called glucosinolates which are known to mediate interactions between Brassicaceae and their associated insect herbivores. They have been recognized as a class of natural pesticides since they exhibit toxic or repellent effects. They establish a significant defence mechanism to protect Brassica plants against pests and diseases. The glucosinolate concentration can increase in response to herbivore feeding, and this high level of glucosinolates can affect both generalist and specialist herbivores. This study evaluate some biological aspects of Cabbage white butterfly when fed its larvae on cabbage seedling infested with Cabbage aphid Brevicoryne brassica by constructing agestage, two sex life table. The results showed that the survival rates off eggs, larvae, pupae, females and males were 1, 1; 0.78, 0.42; 0.64, 0.42; 0.04, 0.06; and 0.02; 0.04 when fed its larvae non infested and infested plants respectively. Life expectancy were 24.04, 17.94; 20.04, 14.54; 7.38, 6.76; 12.8, 9.4 and 4.33, 2.67 respectively too. The reproduction rate of female was 164.66 and 99.87eggs/females,whereas the mortality rates 0.06 at age 7 for larvae fed on health Cabbage plants, while the highest death rate was 0.22 at age 10 when fed on infested plants, and for pupae 0.64 at age 25 and 0.50 at age 26, respectively. The population growth parameters showed that the intrinsic rate of increase (rm) was 0.07, 0.10 individuals/day, finite rate of increase (ג) 1.1077 1.0772, net reproductive rate (R0) 24.64, 11.16 female/female/generation, Groos reproduction rate (Grr) 225.96, 136.95 eggs/female. A difference was also found in the periods required for the doubling time (DT) of the population depending on the insect's feeding, as the minimum period was 6.77 days when feeding on healthy plants, while the highest period was 9.31 days when feeding on plants infested with nymphs of Cabbage Aphid.It was also found that the mean generation time (T) decreased when feed on healthy plants, as it reached 31.31 days, while that period reached 32.42 days when feed infested plants. It is evident from the above results that plants infested with Cabbage Aphid had affected the life aspects of Cabbage white butterfly. The feeding of aphids on Cabbage plants has stimulated its to produce or increase the concentration of some secondary compounds that had an obvious effect on the life of the Cabbage white butterfly.

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COMPARATIVE LIFE TABLE PARAMETERS OF THE CABBAGE WHITE BUTTERFLY PIERIS RAPAE FEEDING ON CABBAGE PLANTS INFESTED WITH SUCKING INSECTS BY CONSTRUCTING AGE- STAGE, TWO SEX LIFE TABLE