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

Document Type : Original Article

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Applied Entomology Dept., Fac. of Agric., Univ. of Alexandria.

Abstract

Effects of butanol and petroleum ether crude extracts of Bauhinia purpurea on Sopdoptera littoralis were studied by feeding method for the concentrations of 5, 10, 50 and 100 ppm. The results showed reduction in the pupae weight values of S.littoralis, these values were between 196.40 to 136.67 mg while it weighed 257- 260.33 mg in the control. The inhibition of the adult formation percentages were ranged between 43.33 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 285.13 eggs per female, while it was 1186.52 eggs per female in the control with hatchability percentages ranged from zero to 87.2%, while it was 97.6 % 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 22.44 mg/day, while it recorded 58.4 - 84.45mg/day in the control. The efficiency of conversion of digested food (ECD %) values were reduced between 60. 96 to 91.32, while it recorded 166.03 - 201 in the control. The feeding deterrence index (FDI) values at 100 ppm were 41.64 % with butanol and 42.38% 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 31.505 mg/gm for the control, while it was 18.723 mg/gm for the Bauhinia butanol extract at the concentration of 50 ppm.

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