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室内毒力测定结果表明,24 h 25%甲维.毒死蜱水乳剂对3龄稻纵卷叶螟幼虫致死中浓度为18.86 mg/L,共毒系数156.02,超过120,表现增效作用明显。从田间试验结果可以看出,600~1 200 mL/hm225%甲维.毒死蜱水乳剂药后5 d和14 d对水稻纵卷叶螟防治效果随着浓度的增高而升高,药后5 d对稻纵卷叶螟的平均控虫效果80.43%~94.33%,保叶效果51.72%~84.56%;药后15 d平均控虫效果72.62%~89.32%,保叶效果70.46%~88.99%。试验剂量范围内对水稻植株生长无不良影响。从防效和成本综合考虑,推荐剂量为900~1 200 mL/hm2,水量不少于750 kg/hm2。在稻纵卷叶螟卵孵盛期和低龄虫期,无雨水天和无露水时均匀细喷雾防治。
The results of indoor toxicity test showed that the 24 h 25% methylparaben water emulsion had a lethal concentration of 18.86 mg / L and a co-toxicity coefficient of 156.02, which was more than 120, indicating synergistic effect. From the field test results, it can be seen that the control efficacy of 600 ~ 1,200 mL / hm225% methylpalachlor emulsion 5 d and 14 d on rice leaf roller increases with increasing concentration, and after 5 d The average pest control effect on C. medinalis was 80.43% ~ 94.33%, the effect of leaf protection was 51.72% ~ 84.56%. The average pest control effect was 72.62% ~ 89.32% on 15 days after drug treatment, and the effect of leaf protection was 70.46% ~ 88.99%. No adverse effects on rice plant growth within the experimental dose range. Considering the combination of prevention and cost, the recommended dosage is 900-1 200 mL / hm2, and the water volume is not less than 750 kg / hm2. In the rice leaf roller larvae incubation period and low age of worm stage, no rainy days and even fine spray prevention and control.