IMPACT OF ENTOMOPATHOGENIC FUNGUS Beauveria bassiana (BALSAMO) ON ADULT OF SUGAR-BEET TORTOISE BEETLE, Cassida vittata (VILL.). | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 4, Volume 30, Issue 3, March 2005, Page 1679-1684 PDF (467.09 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2005.238775 | ||||
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| Authors | ||||
| M. M. Rabie1; Eglal M. Abd El-Moneim2; M. A.A. Abd El-Raheem3 | ||||
| 1Department of Economic Entomology and Pesticides, Faculty of Agricultural, Cairo University, Giza, Egypt. | ||||
| 2Plant Protections Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt. | ||||
| 3Department of Pests and Plant Protection, National Research Centre, Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| Adults of Cassida vittata were treated in the laboratory with different concentrations of the fungal spores of Beauveria bassiana. The insects were dipped in the spore suspensions for five seconds. The concentrations used in the treatments were as follows, 108, 5 x107, 107, 5 x106 and 106 spore/ml water. The results show that the concentration of 108 caused insect mortality of 5, 10, 20, 20, 35, 50, 70, and 90 % in the period from the second to the ninth day. A complete mortality was reached in the tenth day. The concentration of 5 x107 caused 95 % mortality on the twelfth day. On the same day there were no differences between the two concentrations of 107 and 5 x106 in which the mortality was recorded as 85 %. The percent mortality was recorded as 80% when the insect were treated with the concentration of 106 spore/ml. Insect treatment with the concentration of 108 caused insect mortality of 5, 10, 20, 20, 35, 50, 70, and 90 % in the period from the second to the ninth day respectively. A complete mortality was reached in the tenth day. According to the field application with the concentration of 108 spore/ml, the total numbers of adult at the beginning of the experiments were counted and recorded as 114 /25 and 107 / 25 plant in treated and control respectively. After two weeks it became 65/25 plant and 121 / 25 plants in treatment and control respectively. In the fourth week the number of insects was noticed to be decreased in both treatment and control and recorded 40 and 73 adult insect per 25 plants in treatment and control respectively. In the sixth week the insect population was gradually increased in both treatment and control in which the total number of adult was recorded as 69 and 198 / 25 plants in treatment and control respectively. | ||||
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