In 2009, the plant protection station in Tongzhou District of Nantong City used Kuankuang 20% ​​chlorantranilipronamide suspension and 5% buteneflubenzuron EC as agents to control Cnaphalocrocis medinalis and achieved better defense. Effectiveness provides a basis for large area applications.
The test set up Kangkuan 20% Chlorantraniliprole Suspension 10ml, 5% Butene Fenacetate EC 60ml, 50% Feifung San EC 120ml, 5% Fipronil Suspension 50ml and water A total of 5 treatments were compared and each treatment was repeated 3 times. In the middle of August, during the peak period of 1-3 larvae of three generations of rice leaf roller, 50 kg of water per acre was manually sprayed. The number of leaves and the amount of residual insects were investigated 5 days and 7 days after the drug. The number of leaves and the number of white leaves of each treatment were investigated 15 days and 20 days after the drug, and then the insecticidal effect and the leaf keeping effect of each treatment were calculated.
From the perspective of insecticidal effect, the above four agents showed rapid and effective effects on the larvae of Cnaphalocrocis medinalis, and the control effects of Chlorantraniliprole and Daineng Powder were the most significant. Five days after the drug treatment, the insecticidal effects of chlorantraniliprole and rice powder were 98.46% and 100%, respectively, and the insecticidal effects of butene-fipronil and fipronil were 84.74% and 91.68%, respectively. After 7 days, the control effects of all treatments decreased slightly, but the insecticidal effects of chlorantraniliprole and rice Fengfeng Powder remained above 90%, 92.61% and 97.35%, respectively. Butene and fipronil, fluorine The pesticidal effects of fenpronitrile treatment were 82.58% and 80.95%, respectively.
From the perspective of leaf protection, the control effects of chlorantraniliprole and Dafeng Powder were also significantly better than butpronil and fipronil, consistent with the insecticidal effect. 5 days after the drug treatment, the leaf-protecting effect of chlorantraniliprole was the highest, which was 88.67%, followed by butene-fipronil, the leaf-protecting effect was 76.05%, and the leaf-protecting effect of rice flour and fipronil was only about 60%. 15 days and 20 days after the treatment, the leaf protection effect of each treatment was significantly improved, with the highest control effect of chlorantraniliprole, reaching 97.48%; followed by Daoyin San, 92.93%; butene fipronil, flubenzuron; The nitriles were 88.24% and 82.64%, respectively.
Based on comprehensive analysis of insecticidal and leaf-preserving effects, chlorantraniliprole and Dafenghe prevent and control larvae of Cnaphalocrocis medinalis, which are effective and effective. They are applied once in a suitable period, and their insecticidal and leaf-preserving effects are maintained at over 90%. , significantly better than butene fipronil, fipronil. Production should be mastered at the peak stage of 1~2 instar larvae of rice leaf roller, 20% chlorantraniliprobenamide suspension 10 g or 50% rice oil Fengyun San EC 120 ml per mu, add water 50~60 kg fine spray.
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