Effect of four plant extracts (Vinca, Ak, Neem and Chinaberry)‎ on the level of carbohydrate, proteins and lipids in the body of the 2nd instar larvae of the cabbage worm, Pieris rapae L. (Lepidoptera, Pieridae)‎

الملخص EN

Effect of four plant extracts (vinca Catharanthus roseus, ak Salix alaxensis, neem Azadirachta indica and chinaberry Melia azedarach) on the levels of carbohydrate, proteins and lipids were evaluated in the body of 2nd instar larvae of the cabbage worm, Pieris rapae L.(Lepidoptera, Pieridae).

The results indicated that the total carbohydrate content in the body of the larvae decreased when treated with all tested concentrations of extracts (69.00, 151, 167 and 173.33 mg % for vinca, chinaberry, neem and ak extracts, respectively), compared with 174.43 mg % for control.

Total protein content decreased in the body of larvae when treated with vinca, neem and chinaberry extracts at 118, 155.88 and 183.66 mg %, respectively, but increased in ak extract at 213 mg % compared with 187.66 mg % for control.

Total lipid content decreased in the body of the larvae, when treated with all plant extracts (vinca, chinaberry, ak and neem extracts) at 31.66, 43.66, 68 and 69.33 mg %, respectively, compared with 81.66 mg % for control.

These results indicated that the total percentages of these components were high in ak extract than in vinca extract, while the plant extracts of chinaberry and neem had moderate rate.