Effects of ricinus communis, brassica nigra and mineral oil kemesol on some biochemical aspects of larvae stage of spodoptera littoralis [boisd] [lepidoptera: noctuidae]

The third instars larvae of Spodotera littoralis were topically treated with two plant oils, Ricinus communis and Brassica nigra and one mineral oil, Kemesol 95% dissolved in petroleum ether and acetone at concentrations of 0.8, 1.6, 2.0, 3.0 and 4%. The results revealed that the mean values of the total haemolymph and fat body protein was reduced in larvae treated with B. nigra and Kemesol 95%. A significant decrease was observed in haemolymph and fat body protein contents in larvae treated with all tested compound, the remarked decrease was noticed at the highest dose [4%] in both two solvents

Effects of some botanical extracts on the midgut, integument and fat body of the cotton leaf worm, spodoptera littoralis [lepidoptera: noctuidae]

Botanical extracts [8%] of four plants [Artemisia monosperma, Zygophyllum cocccineum, Lupinus termis and Brassica tournifortii] fed to the 4[th] larval in-stars of Spodoptera littoralis induced histopathological changes in the structure of the midgut, integument and fat body of the 5[th] instars. Zygophyllum coccineum and Lupinus termis induced severe damages in the midgut. The integument of treated larvae showed degeneration in the cuticle and epidermal cells which were also detached from each other. Water extracts of A. monosperma, Z. coccinieum and L. termis were the most promising in inducing shrinkage in the fat body cells and detachment of midgut muscle layers. Also, the degeneration of the midgut membrane and epithelial layer occurs in different degrees with the tested plants. This study supports the use of botanical extracts in pest control programs of lepidopterous insects