Activity ofBacillus thuringiensis isolates on the corn borers,chilo agamemnon Bles. (Crambidae) andOstrinia nubilalis Hbn. (pyraustidae) |
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| Authors: | M Hafez H S Salama A Abdel-Rahman |
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| Institution: | 1. Dept. of Entomology, Faculty of Science, Cairo University, Dokki, Cairo
2. National Research Centre, Tahrir St., Dokki, Cairo, Egypt
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| Abstract: | The potential activity of different varieties ofBacillus thuringiensis was evaluated against the second instar larvae of the two lepidopterous corn borersChilo agamemnon andOstrinia nubilalis. Data on the LC50, slopes, 95% confidence limits and potencies of the tested varieties were determined. WithO. nubilalis, Dipel 2X (Bacillus thuringiensis. var.kurstaki HD-1) was the most potent and the LC50 was 2.68 μg/g diet. The LC50 for other varieties ranged between 3.12 and 31.95 μg/g. In the case ofC. agamemnon, the lowest LC50 was also determined with Dipel 2X being 3.68 μg/g diet; this ranged between 6.2–15.11 μg/g for other tested varieties. |
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