摘要
目的制备毒死蜱·氟虫腈微胶囊悬浮剂,研究成囊条件对微胶囊指标的影响,并考察该产品对德国小蠊的防制效果。方法通过原位聚合法制备微胶囊剂,并通过强制接触、模拟室内及室内现场等实验评价该产品效果。结果明胶是较为理想的成囊助剂,用量(质量分数)为0.5%时农药有效成分的成囊包封率可达97%以上,囊形均匀、圆滑,囊径和囊壁厚度适中;毒死蜱·氟虫腈微胶囊悬浮剂对德国小蠊具有良好的杀灭效果,在用量为20mg·ai/m2时,对德国小蠊的KT50为9.8min,24h死亡率为100%;产品具有突出的持效性,用药后90d再接触试虫,14d杀灭率仍可达100%,明显高于对照乳油产品(80.5%);现场实验效果表明,用量为20mg·ai/m2时,对德国小蠊30d杀灭率超过99%,有效时间可达1年。结论毒死蜱和氟虫腈经微胶囊化后对德国小蠊具有良好的击倒性和突出的持效性,可有效减少施药量和施药次数。
Objective To prepare chlorpyrifos, fipronil microcapsule suspension （CS） and analyze the influence of encapsulation parameters on the quality indices of microcapsules, and to investigate the control effect of this product on Blattella germanica. Methods The CS was prepared by in-situ polymerization. The control effect of the CS on B. germanica was evaluated by forced contact and simulated indoor trials. Results Gelatin was the optimal surfactant to prepare chlorpyrifos- fipronil CS. When the weight percent of gelatin was 0.5%, the encapsulating rate of effective components was above 97%, and the microcapsules with uniform and smooth shapes and moderate diameters and wall thickness were obtained. Chlorpyrifos. fipronil CS showed excellent performance in killing B. germanica. When the dose of CS was 20 mg· ai/m^2, the KTs0 value for B. germanica was 9.8 min, and the 24 h mortality of B. germanica was 100%. The CS had sustained control effect. When brought into contact with B. germanica at 90 d after initial use, the CS achieved a killing rate of 100% within 14 d, demonstrating a significantly better performance than the emulsion product as a control （80.5%）. When applied at a dose of 20 mg· ai/m^2, the CS achieved a killing rate of 99% within 30 d, and its control effect lasted for one year. Conclusion Chlorpyrifos＇ fipronil CS shows excellent performance in killing B. germanica and has sustained control effect, which can reduce the amount of pesticide and the frequency of pesticide application.
出处
《中国媒介生物学及控制杂志》
CAS
CSCD
2013年第2期128-131,共4页
Chinese Journal of Vector Biology and Control
基金
浙江省自然科学基金(Y405517)
杭州市科技发展项目(20070632B03
20110232B11)
浙江省重点科技创新团队项目(2010R50028)~~
关键词
毒死蜱
氟虫腈
微胶囊悬浮剂
德国小蠊
杀灭效果
Chlorpyrifos
Fipronil
Microcapsule suspension
Blattella germanica
Killing effect
