喷雾方式及桶混助剂对啶虫脒防治棉蚜效果的影响

Influences of Spray Method and Tank-mix Adjuvant on Pymetrozine against Aphis gossypii in Cotton Fields

[目的]为减少田间施药量与用水量,利用扇形喷雾技术对暴发期棉蚜进行田间药效试验。[方法]采用单因素随机区组试验设计,开展喷头类型与桶混助剂对啶虫脒防控棉蚜的影响试验。[结果]采用扇形喷雾技术防治棉蚜,当药量不变水量降低50%,处理棉蚜3 d后防效达95.2%,7 d后防效达98.6%;当药液中加入桶混助剂,药量降低20%时,处理棉蚜3 d后防效均大于97.1%,7 d后防效达100%。[结论]采用扇形喷头替代锥形喷头喷雾防治棉蚜,提高了药液的雾化效果,生产中可节省用水量50%。施药前添加桶混助剂显著降低了啶虫脒药液表面张力,可节省药量20%。

[Aims] This study aims to adopt the fan-shaped spray technology in the field trials for controlling outbreak of Aphis gossypii to reduce the dose of acetamiprid and water. [Methods] Using single factor randomized block design of experiment, the control experiments were conducted based on two field spray and tank-mix adjuvant. [Results] The field result indicated that the control effect ofA. gossypii reached 95.2% after 3 days and 98.6% after 7 days using the fan-shaped nozzles when the spray volume maintained and water volume decreased by 50%; the effect against A. gossypii was above 97.1% after 3 days and 100% after 7 days when added the tank-mix adjuvant into pymetrozine with the decrease of 20% spray volume. [Conclusions] The fan -shaped nozzles instead of conical nozzles improved the effect of the liquid atomization, could save water 50% in production. Tank-mix adjuvant increased the surface tension of the acetamiprid solutions on the leaves and acetamiprid was reduced by 20%.