ANTIFEEDANT PROPERTIES OF VENKA ROSA (APOCYNACEAE) AGAINST SCHISTOCERCA GREGARIA FORSKAL.

Document Type : Original Article

Authors

1 Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt

2 Faculty of Science, Al - Azhar University, Nasr City, Cairo, Egypt

3 Faculty of Science, Menofia University, Egypt

Abstract

The antifeeding properties of Venka rasa was studied on 2nd, 3rd, 4th and 5th instar nymphs and adult stages of Schistocerca gregaria. Crude extracts in water and acetone were used . Acetone extract was more potent that water extract. Feeding reduction percentages were 100% against the nymphal instars and 81.97. % against the adult stage. In case of water extract, the feeding reduction percentages ranged from 95.89 to 100% against the tested nymphal instars and was 96.29% against the adult stage. Feeding reduction percentages decreased by water dilution. The percentages ranged from 100 to 31.25% against the 5th nymphal instar and from 100 to 81.61% for the adult stage.

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