Aswad et al., 2003;Ragaei and Sabry, 2011). The unwise and continuous use of insecticides for controlling agricultural pests leads to adverse effects on beneficial insects, wildlife, animals and humans; this is to environmental pollution and residues in foods (Abdel-Hafez and Mohamed, 2009;Ehab, 2012). In recent times, research is focused on advanced safer pesticides, so, the natural products of plant origin especially the unused parts of plants such as leaves, that are often burnt by farmers, are considered the perfect choice to avoid the disadvantages of pesticide use, as they would be cheap, nonhazardous and easy to use (Koul, 1987;Ghada et al., 2017).Recent studies used GC-MS (Gas chromatography) to analyze the tested plant extracts to detect the major components in the extracts (Zouaghi et al., 2019).The objective of the present study is to test the effect of four plant extracts from unused parts of plants, which were, leaves of tomato, eggplant, pepper and okra on the proportion of egg hatching of cotton leafworm and use GC-Mass for the most effective extracts' analysis.