飞防助剂和施药液量对植保无人飞机喷施雾滴沉积和棉花蓟马防效的影响

为明确飞防助剂和施药液量对植保无人飞机喷施在棉花冠层的雾滴沉积和对棉花上蓟马防效的影响，选择倍达通、功倍、杰效丰和迈丝4种飞防助剂，设置3种施药液量，通过田间试验研究了植保无人飞机喷施25%噻虫嗪水分散粒剂后其在棉花冠层的雾滴密度、覆盖率、沉积量和雾滴均匀性以及对棉花上蓟马的防效。结果表明，4种飞防助剂和3种施药液量对植保无人飞机喷施的雾滴沉积和蓟马防效均有显著影响。增加施药液量可显著增加雾滴在棉花冠层的密度与覆盖率，添加飞防助剂对雾滴密度的提升效果显著。4种助剂对农药雾滴在棉花冠层上、中、下部的覆盖率的影响趋势较为一致，与棉花冠层上部相比，对中、下部位覆盖率的影响较低。施药液量为2 L/667 m²时，添加倍达通、功倍、杰效丰、迈丝及无助剂对照的雾滴穿透性分别为46.0%、49.1%、33.6%、36.1%和44.3%,该施药液量下各处理雾滴穿透性均较好。随着施药液量增加，药后1、3、7 d对棉花蓟马的防效也显著提升。在相同施药液量下，25%噻虫嗪水分散粒剂药液中添加飞防助剂倍达通和杰效丰相较于功倍和迈丝，对棉花蓟马具有更高的防治效果。试验结果为植保无人飞机防治...

Effects of spray adjuvants and spray volumes on droplet deposition by plant protection UAV and the control efficacy against cotton thrips

In order to clarify the effects of spray adjuvants and spray volumes on droplet deposition by plant protection unmanned aerial vehicles (UAV) and the control efficacy against cotton thrips, four kinds of aviation spray adjuvants (Beidatong, Gongbei, Jiexiaofeng and Maisi) and three spray volumes (1, 1.5, 2 L) were selected. Field experiments were conducted to study the droplet density, coverage, deposition and droplet uniformity of thiamethoxam 25% WG sprayed by plant protection UAV, as well as their control effects on thrips in cotton fields. The results showed that the four spray adjuvants and the three spray volumes had significant effects on droplet deposition by plant protection UAV and the control efficacy against cotton thrips. The increase of spray volume could significantly increase the droplet density and coverage in the cotton canopy. Spray adjuvants had more effect on droplet density and less impact on droplet coverage and deposition. The influence trend of the four adjuvants on droplet coverage was relatively consistent, but the influence on droplet coverage in middle and lower canopy of cotton was lower compared with the upper canopy. When the spray volume was 2 L/667 m2, the penetration of droplets for the treatments of Beidatong, Gongbei, Jiexiaofeng, Maisi and non-adjuvants was 46.0%, 49.1%, 33.6%, 36.1% and 44.3%, respectively. The control efficacy against cotton thrips on day one, three and seven after treatment significantly increased with increasing spray volume. Under the same spray volume, adding Beidatong and Jiexiaofeng showed higher control efficacy than adding Gongbei and Maisi. The results provide a scientific basis for the control of cotton thrips by plant protection UAV.