EFFECT OF CONYZA DIOSCORIDIS LEAF EXTRACTS ON THREE MAJOR INSECTS OF STORED PRODUCTS IN EGYPT

Document Type : Original Article

Authors

1 Plant Protection Department, Faculty of Agriculture, Moshtohor, Zagazig University, Egypt

2 Plant Protection Research Institute, Agricultural Research Centre, Giza, Egypt

Abstract

This work aims to evaluate the toxic and repellent effect of ace‌tone and petroleum ether extracts of the Barnouf plant leaves (Conzya dioscoridis) againts three insects of stored products in Egypt, i.e. Sitoph‌dos oryzae (L.), Rhizopertha dominica (F.) and Tribolium castaneum (Herbst). Results showed that, at the highest concentration (10%) used, average commulative mortalities with the acetone plant extract after 21 days form treatment amounted to 43.3%, 42.5% and 24.4% for the adults of S.oryzae, R.dominica and T.castaneum, respectively. The corrsponding values with the petroleum ether extract of the plant were 65.0%, 43.3% and 10.4% for the aforementioned insects, respectively, indicating that S.oryzae was the most sensitive one, fol‌lowed by R.dominica and T.castaneum. Repellency values at the highest concentration (10%), during an observation period of 21 days, revealed that acetone extract of the plant was strongly repellent of S.oryzae-adults, while was negligible in the case of R.dominica and T.castaneum. Meanwhile, petroleum ether ex‌tract of the plant showed moderate repellent effect with S.oryzae and R.dominica, while this effect was low for T.castaneum-adult at the high‌est concentration. Susceptibility of the three tested insects to the ex‌tract of the plant leaves; Conza dioscoridis was found independent of each other.

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