Abstract

We evaluated spray coverage on grape leaves and bunches by a high-volume sprayer (HVS), an air-assisted, low volume knapsack sprayer (LVS), and a motorized knapsack dust applicator modified to spray liquid formulations (common sprayer – CS). At the full development of the vine canopy 1400, 250 and 150 L ha⁻¹ were applied via HVS, CS and LVS, respectively. Sprayer type, leaf or bunch orientation, leaf position and leaf side significantly affected spray coverage (P < 0.001). Mean spray coverage on leaves or bunches was below 21% for CS, and above 40 and 55% for LVS and HVS, respectively. Downy mildew leaf infection was below 5% throughout the season, with a significant effect of sprayer, time and an interaction between sprayer and time (P < 0.001). Grape berry moth damage did not differ between sprayers and the untreated control. The current work suggests that LVS might be a viable alternative to HVS, but further work is needed to establish whether differences in spray coverage affect biological efficacy.

摘要

我们使用大容量喷雾器 (HVS)、空气辅助低容量背负式喷雾器 (LVS) 和经过改装以喷洒液体配方的电动背负式喷粉器（普通喷雾器 - CS）评估了葡萄叶和葡萄串的喷雾覆盖率。在葡萄树冠完全发育时，分别通过 HVS、CS 和 LVS 施用 1400、250和 150 L ha ^{-1 。}喷雾器类型、叶或束方向、叶位置和叶侧显着影响喷雾覆盖率（P  < 0.001）。CS 的叶片或束的平均喷雾覆盖率低于 21%，LVS 和 HVS 分别高于 40% 和 55%。整个季节霜霉病叶片感染率低于5%，喷雾器、时间和喷雾器与时间的相互作用影响显着（P < 0.001)。喷雾器和未经处理的对照之间的葡萄浆果蛾损害没有差异。目前的工作表明 LVS 可能是 HVS 的可行替代方案，但需要进一步的工作来确定喷雾覆盖率的差异是否会影响生物功效。