Title: Studies on Combination Effect of Etomolopathogenic Nematode H06 and Insecticide against Bradysina odoriphaga
Abstract: The combination effect of entomolopathogenic nematodes and 4 insecticides against Bradysina odoriphaga was evaluated in laboratory. The results showed that entomolopathogenic nematode Heteroabditis bacteriphora H06 was low infectivity(1.2%~23.8%) against B. odoriphaga in dose of 150~300 IJs/larvae. The LC50 value of the 4 insecticides to larvae of B. odoriphaga was 0.34~8.79 mg/L,and followed the order of toosendarinchlorpyrifosphoximimidacloprid. The LC50 value of the 4 insecticides to H06 was 595~4 388 mg/L. However, the mortalities of B.odoriphaga caused by nematode-insecticide combination were higher than that of insecticide or nematode alone. After treated for 2 d, the mortalities caused by phoxim 12.5~100 mg/L+H06 and toosendarin 0.16~1.25 mg/L+H06 were 73.0%~82.0% and 90.0%~97.5%,respectively; while that caused by phoxim and toosendarin alone were just 38.0%~60.0% and 13.8%~37.5%,respectively. Chlorpyrifos(15~120 mg/L) and imidacloprid(1.56~12.54 mg/L) applied alone caused 14.0%~28.0% and 0.0%~7.5% mortalities respectively, but their combinations with H06 caused 50.0%~65.0% and 58.8~80.0% mortalities respectively. After treated for 5 d, the mortalities caused by chlorpyrifos+H06 and imidacloprid +H06 were 87.0%~95.0% and 61.3%~88.8%,respectively. The study showed that entomolopathogenic nematodes could be mixed with 4 insecticides for controlling B. odoriphaga.
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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