Effect of carbosulfan insecticide on efficacy of entomopathogenic nematode Steinernema carpocapsae Weiser (Rhabditidae: Steinemematidae) for control of rice leaffolder, Cnaphalocrocis medinalis (Guenee) larvae (Lepidoptera: Pyralidae)
2000
Watanasit, S. | Buakwun, O. | Pholpunthin, C. (Prince of Songkla Univ., Songkhla (Thailand). Faculty of Scinece. Dept. of Biology)
Laboratory experiments were conducted to determine the effect of carbosulfan insecticide on behavior and efficacy in killing larvae of rice leaffolder, Cnaphalocrocis medinalis (Guenee), of the entomopathogenic nematode Steinernema carpocapsae Weiser. Reaction of S. carpocapsae which were mixed with carbosulfan insecticide (1000 individual/ml) at 15, 30, 60 minutes and 24 hours showed that they could survived in total mixed solution. However, the motility of S. carpocapsae was decreased when they were mixed with carbosulfan insecticide at 60 minutes and 24 hours. Moreover, S. carpocapsae which were mixed with carbosulfan insecticide at 24 hours before applying them on larvae of C. medinalis on filter paper were able to kill 80 percent of C. medinalis. This study showed that S. carpocapsae can tolerate carbosulfan insecticide and still be effective in the control of the larvae of C. medinalis.
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