الفهرس 
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Abstract
Accordingly, this study was planned to investigate the effect of cold water and alcoholic extracts of Trigonella foenum (fenugreek) and Lupinus luteus (yellow lupine) on the biological attributes and biochemical responses of the 4th instar larvae of Spodoptera littoralis (the cotton leafworm).
The main objective of this study is to investigate the possibility of using plant extracts as insecticides to control the cotton leafworm.
Thus, in our study a recommended pesticide namely chlorpyrifos (dursban) was used as a reference to compare its effect on some biological and biochemical aspects of the 4th instar larvae of the cotton leafworm with those obtained from water and alcoholic extracts of fenugreek and yellow lupine.
Results indicated that both water and alcoholic extracts of fenugreek and yellow lupine were effective against the cotton leafworm, especially at the concentration of 10%; while fenugreek extract was the most effective agent as it affects larval, pupal and adult stages of the tested insect. It also reduce protein level, alkaline and acid phosphatases levels.