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为了测定和评价20%虫酰肼悬浮剂对甜菜夜蛾的防治效果和安全性,为其推广使用提供技术支持,利用20%虫酰肼悬浮剂对甘蓝甜菜夜蛾幼虫进行了田间药效试验研究。结果表明,20%虫酰肼悬浮剂对甘蓝甜菜夜蛾的防治,在有效成分用量200~300 g/hm2范围内,药后1~2 d防效为83%~99%,药后3~5 d防效为86%~99%,药后7~10 d防效为89%~98%,防效好于对照药剂48%毒死蜱乳油和1%甲氨基阿维菌素苯甲酸盐乳油,其速效性好、持效性较长。20%虫酰肼悬浮剂可以作为防治甘蓝甜菜夜蛾的有效替代药剂进行推广使用,最佳用药量以有效成分用量200~300 g/hm2为宜。 相似文献
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Lu Qian 《Pesticide biochemistry and physiology》2008,91(3):175-179
Experiments have been carried out to confirm the cross-resistance between abamectin and tebufenozide in Plutella xylostella and demonstrate its mechanism. The results showed that the resistant strain of P. xylostella selected by tebufenozide (RF 99.38) really showed high cross-resistance to abamectin (RF 29.25). When this strain was subjected to resistance decaying treatment, breeding without contacting any insecticides, and abamectin resistance selection for 20 generations, the former resulted in decrease of its resistance to both tebufenozide and abamectin to about one third of the original (RF 35.03 and 11.67, respectively), and the later enhanced its resistance to abamectin dramatically (RF 303.77), but not to tebufenozide(RF 50.04). PBO showed high synergism to abamectin (SR 2.11-12.23), and the synergism ratio positively related to the resistance level among different strains. Enzyme analysis also proved that the activity of cytochrome P450 monooxygenase (MFO) was notable enhanced in the strains resistant to both tebufenozide and abamectin (1.71- to 3.01-fold). Based on discussion, it was concluded that tebufenozide selection could resulted in significant cross-resistance of P. xylostella to abamectin. The major mechanism for the cross-resistance should be the enhancement of MFO activity. For resistance management, tebufenozide and abamectin would not recommend for rotational use. 相似文献
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[目的]评价虫酰肼在水稻及稻田中的残留动态和生态安全性.[方法]采用田间试验方法,研究了虫酰肼在稻田水、土壤和水稻植株中的消解动态,测定了虫酰肼在水稻和土壤中的最终残留量.样品用乙腈提取,提取液用二氯甲烷萃取,经弗罗里硅土-活性炭柱净化,采用HPLC-UVD测定.[结果]在稻米、稻田水、土壤、水稻植株和稻壳的空白样品中分别添加3个质量水平虫酰肼的平均回收率为86.79% ~ 110.47%,平行测定的变异系数为1.39% ~ 6.08%;虫酰肼在稻田水、土壤和水稻植株中的消解半衰期分别为3.73 ~ 9.05、7.76 ~ 13.32、3.14~7.31d;用20%虫酰肼悬浮剂210 g/hm2(推荐使用剂量)和315 g/hm2(高剂量)间隔7d分别施用2次和3次,稻米中虫酰肼的最高残留量为0.103 mg/kg,低于我国规定的虫酰肼在糙米中的最大残留限量(MRL)2 mg/kg.[结论]在水稻移栽田施用20%虫酰肼悬浮剂210 g/hm2,间隔7d,最多施药2次,距末次施药21 d以上,收获的糙米食用是安全的. 相似文献
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虫酰肼对甜菜夜蛾子代种群的影响 总被引:8,自引:0,他引:8
为了解虫酰肼对甜菜夜蛾的作用机理,以较低剂量分别对甜菜夜蛾敏感品系幼虫和成虫进行饲毒处理,观察其对甜菜夜蛾子代种群的影响.结果表明:虫酰肼是有极强后效性的杀虫剂,能降低甜菜夜蛾产卵量、化蛹率、羽化率等,提高畸形蛹、畸形蛾比例,缩短成虫寿命及产卵时间.幼虫一次饲毒后,0.2、0.4 mg/kg两处理的种群趋势指数第2代较对照分别下降10.92%、26.71%,第3代下降12.16%、14.24%,说明这种影响至少可持续到第3代,且用药剂量提高,其影响加大,但孵化率与蛹重变化不明显.成虫饲毒表明,0.4、0.8mg/L两处理的种群趋势指数在第2代较对照分别下降14.18%、12.96%,第3代下降34.40%、39.24%,说明成虫饲毒对甜菜夜蛾的影响随用药次数增加而提高.甜菜夜蛾成虫寿命与虫酰肼选择频率及选择压呈负相关关系,且对雄成虫影响大于雌成虫. 相似文献
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20%虫酰肼悬浮剂防治甜菜夜蛾田间药效试验 总被引:3,自引:2,他引:1
[目的]测定和评价20%虫酰肼悬浮剂对甜菜夜蛾的防治效果和安全性,为其推广使用提供技术支持。[方法]采用叶面喷雾法施药并测定不同用量的20%虫酰肼SC和25g/L溴氰菊酯EC防治甜菜夜蛾的效果。[结果]20%虫酰肼悬浮剂对甜菜夜蛾有较好的控制效果,药后3和7d,20%虫酰肼各处理防治效果分别达81%和84%以上,高于25g/L溴氰菊酯EC处理的防治效果。[结论]20%虫酰肼SC用于防治甜菜夜蛾,效果好,持效期为7d以上,并且对环境污染少,对甘蓝安全,是防治蔬菜甜菜夜蛾的理想药剂。 相似文献
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试验结果表明:在稻纵卷叶螟的卵孵始盛期和稻飞虱的若虫盛期,用虫酰·辛硫磷20%乳油100g/667m2,药后15d对稻纵卷叶螟与稻飞虱的防治效果均达到95%以上。对稻纵卷叶螟的防治效果显著优于稻丰散50%乳油120g/667m2,对稻飞虱的防治效果与吡蚜酮25%可湿性粉剂25g/667m2之间无显著差异。 相似文献
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