4种化学杀虫剂对茶谷蛾的室内毒力测定

为有效防控云南茶树重要的食叶性害虫茶谷蛾(Agriophara rhombata)，筛选防治茶谷蛾的适用药及适用量，指导科学用药。在室内采用浸叶法测定24～96 h 4种不同稀释倍数杀虫剂对茶谷蛾3龄幼虫的毒力作用。结果表明，4种化学杀虫剂对3龄茶谷蛾幼虫的毒力作用由强到弱表现为：24～72 h时，6%乙基多杀菌素悬浮剂(SC)>15%茚虫威乳油(EC)>15%唑虫酰胺SC>24%虫螨腈SC;96 h时，6%乙基多杀菌素SC>24%虫螨腈SC>15%茚虫威EC>15%唑虫酰胺SC。6%乙基多杀菌素SC与15%茚虫威EC具有较强毒杀力及速效性，可作为应急防治茶谷蛾的推荐药剂；24%虫螨腈SC发挥作用较缓，具有明显的时间—剂量—死亡率效应。研究结果可为云南茶区茶谷蛾的防治提供参考基础和依据。

Laboratory Toxicity of Four Chemical Insecticides Against Agriophara rhombata

To effectively control Agriophara rhombata, an important leaf-eating pest of tea trees in Yunnan Province, suitable drugs and dosages were screened out to guide the reasonable application of insecticides. In this study, the toxicity of four insecticides at different dilution rates to the 3rd A. rhombata from 24 to 96 h was determined by leaf dipping method in laboratory. The results showed that the toxicity sequence of the four chemical insecticides to the 3rd A. rhombata was as follows: from 24 to 72 h, spinetoram 6% SC> indoxacarb 15% EC> tolfenpyrad 15% SC> chlorfenapyr 24% SC. At 96 h, spinetoram 6% SC> chlorfenapyr 24% SC> indoxacarb 15% EC> tolfenpyrad 15% SC. Therefore, spinetoram 6% SC and indoxacarb 15% EC have strong toxicity and quick efficacy, which can be recommended for emergency control of A. rhombata. Chlorfenapyr 24% SC has slow effect and obvious time-dose-mortality effect. The study results will provide a reference basis for the control of A. rhombata in Yunnan tea planting area.