Efficiency of some Synthetic Insecticides on Brown Planthopper (Nilaparvata lugens (Stål)) in Irrigated Paddy Fields at Phitsanulok Province
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Abstract
The brown planthopper (BPH), Nilaparvata lugens (Stål) (Hemiptera: Delphacidae), is one of the most destructive insect pests of rice in Thailand, especially in irrigated rice paddy fields. BPH population trends change annually due to insecticide resistance and climate change. Therefore, continuous assessment of commonly used insecticides is necessary. Accordingly, the efficiency and toxicity of thirteen synthetic insecticides, including fenobucarb 50% EC, benfuracarb 20% EC, carbosulfan 20% EC, profenofos 50% EC, triazophos 40% EC, ethiprole 10% SC, cypermethrin 35% EC, lambda-cyhalothrin 2.5% EC, etofenprox 20% EC, dinotefuran 10% SL, thiamethoxam 25% WG, clothianidin 16% SG, and buprofezin 40% SC against BPH were evaluated, along with the toxicity of the effective insecticides. The results showed that fenobucarb, benfuracarb, profenofos, and triazophos caused 100 % mortality in BPH within 24 hours, comparable to chlorpyrifos (positive control) in controlling BPH. Their respective LC50 values were 612.15, 187.14, 621.31, and 1,409.08 ppm, respectively
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References
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