RESPONSE OF SCHISTOCERCA GREGARIA (FORSK.) TO AZADIRACHTIN EXTRACTED FROM NEEM TREE SEEDS (AZADIRACHTA INDICA A JUSS.) | ||||
Egyptian Journal of Agricultural Research | ||||
Volume 72, Issue 2, August 1994, Page 393-399 PDF (1.66 MB) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/ejar.1994.450646 | ||||
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Author | ||||
ABDEL-AZIM M. EL-GAMMAL | ||||
Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt | ||||
Abstract | ||||
The antifeedant action of Azadirachtin as well as its biological effects against the nymphal and adult stages of the desert locust, Schistocerca gregaria were studied. Low concentrations of this compound ( 20, 2 and 1 ppm ) exhibited strong antifeedant action against the 4th and 5th instars and the adult stage of this insect. These concentrations induced 100, 60 and 40% feeding reduction against the 4th instar ; 100, 75, and 72.5% feeding reduction against the 5th instar ; and 100, 50 and 18.75 % feeding reduction against the adult stage respectively. Using injection technique, azadirachtin had a hormone- like effect against the last nymphal instars such as expressed by high failure in ecdysis, prolongation in the 4th and 5th stadium and permanent nymphs. | ||||
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