BIOLOGICAL ACTIVITY OF TWO CRUDE EXTRACTS FROM Bauhinia purpurea AGAINST Spodoptera littoralis (BOISD.)

Effects of butanol and petroleum ether crude extracts of bauhinia purpurea on sopdoptera littoralis were studied by feeding method for the concentrations of ٥, 10, ٥0 and 100 ppm. the results showed reduction in the pupae weight values of s.littoralis, these values were between 19٦٫٤0 to 13٦٫٦7 mg while it weighed 2٥7- 2٦0٫33 mg in the control. the inhibition of the adult formation percentages were ranged between ٤3٫33 to 93٫33 %. the fecundity, fertility and spermatophores numbers were studied and the mating possibilities were carried out for the adults resulted from the treated larvae with the previous tested concentrations of petroleum ether crude extract of bauhinia and compared with the control. the numbers of eggs laid were reduced and ranged from zero to 28٥٫13 eggs per female, while it was 118٦٫٥2 eggs per female in the control with hatchability percentages ranged from zero to 87٫2٪, while it was 97٫٦ % in the control. the histological studies illustrated heavily destruction of the reproductive structure of male and female when the both extracts of bauhinia were applied. also, the nutritional indices were calculated, the relative growth rate (rgr) values were reduced between 38.77 to 22٫٤٤ mg/day, while it recorded ٥8٫٤ - 8٤٫٤٥ mg/day in the control. the efficiency of conversion of digested food (ecd %) values were reduced between ٦0. 9٦ to 91٫32, while it recorded 1٦٦٫03 - 201 in the control. the feeding deterrence index (fdi) values at 100 ppm were ٤1٫٦٤ % with butanol and ٤2٫38٪ with petroleum ether crude extract of bauhinia. on the other hand, the effect of butanol crude extract of bauhinia on chitin formation caused inhibition in the larval growth of the cotton leafworm. the chitin formation ratio value displayed 31٫٥0٥ mg/gm for the control, while it was 18٫723 mg/gm for the bauhinia butanol extract at the concentration of ٥0 ppm.