Abstract
Natural insecticides have been used for pest control, offering an effective alternative to synthetic pesticides. The insecticidal activity of three species belonging to family Chenopodiaceae (Atriplex farinosa Forssk, A. nummularia Lindl. and Haloxylon salicornicum (Moq.) Bunge ex Boiss.) were investigated. Plant material from each species was ground and each extract was subjected to fractionation. Insecticidal activity of total extracts and fractions were tested in feeding, contact, and egg hatchability tests usingHelicoverpa zea (Boddie), a major agricultural pest that feeds on numerous crops, including cotton (cotton bollworm), corn (corn earworm) and tomato (tomato fruit worm). A. farinosashowed the highest mortality of the larvae in contact test. A. nummularia and H. salicornicum also exhibited lower activity. Similar results were obtained on the hatchability of eggs test, but no significant effects were detected in feeding tests. Key words: Atriplex farinosa, Atriplex nummularia, Haloxylon salicornicum, insecticidal activity, Helicoverpa zea.
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