Insecticide spray drift reduction with different adjuvants and spray nozzles

ABSTRACT Insecticide spray drift can lead to reduced control efficiency and loss of product to the environment. Thus, we conducted a study to evaluate the effect of different spray nozzles and the addition of adjuvants in insecticide spray on the resulting droplet spectrum and wind tunnel drift. All experiments were conducted in a completely randomized design with four repetitions using a 5 × 3 factorial scheme. Five spraying solutions were studied; one contained only water and the other four comprised thiamethoxam + lambda-cyhalothrin (no adjuvant, Oro-solve, Wetcit Gold, and Orobor N1), in combination with three spray nozzles (AXI, JFC, and J3D). The droplet spectrum was evaluated through the volumetric median diameter, relative amplitude, and percentage of the droplet volume with diameter ≤ 100 µm. The drifts were evaluated in a wind tunnel at 5, 10, and 15 m. Data were subjected to analysis of variance and means were compared using the Tukey’s test. In addition, a principal component analysis was performed. Application of the insecticide with the adjuvants combined with the different nozzles changed the droplet spectrum and the risk of drift. The AXI nozzle and the J3D associated with the Oro-solve and Wetcit Gold adjuvants resulted in a greater volumetric median diameter of the droplets and drifts were observed at 5 m.

摘要 杀虫剂喷雾飘移可能导致防控效果下降，且药剂会流失至环境中。因此本研究旨在评估不同喷雾喷嘴以及杀虫剂喷雾中添加助剂对所产生的雾滴谱以及风洞飘移的影响。所有实验均采用完全随机设计，设置4次重复，使用5×3因子试验方案。本研究共设置5种喷雾药液：1种仅含清水，其余4种均为噻虫嗪（thiamethoxam）+氯氟氰菊酯（lambda-cyhalothrin）药剂（分别设置无助剂、添加Oro-solve、Wetcit Gold及Orobor N1助剂四种处理），并搭配3种喷雾喷嘴（AXI、JFC及J3D）。通过体积中径、相对跨度以及直径≤100μm的雾滴体积占比，对雾滴谱进行评价。在风洞的5m、10m及15m位置对飘移量进行测定。对数据进行方差分析，采用图基（Tukey）检验进行均值比较；此外还开展了主成分分析。将杀虫剂与助剂结合不同喷嘴施用，可改变雾滴谱特征与飘移风险。搭配AXI喷嘴，以及将J3D喷嘴与Oro-solve、Wetcit Gold助剂联用时，雾滴体积中径更大，且在5m位置可检测到药剂飘移。