Abstract
Three commercial air-assisted sprayers were tested in a hedgerow vineyard, at full vegetative development (end of July; leaf area index = 1.94), using a water-soluble food dye as a tracer. The spraying equipment used was (1) a high-volume (1355 l ha −1) axial-fan sprayer; (2) a low-volume (246 1 ha −1) compressed-air sprayer (3) a sprayer fitted with deflectable air outlets, allowing an adjustment of the output angle, relative to the row direction, from 90 ° to 118 °. All application techniques appeared to be capable of delivering more than 64% of the sprayed material onto the leaves and grapes. The high-volume sprayer provided the most uniform distribution over the foliage. The change of the output angle from 90 ° to 118 ° did not significantly affect total leaf deposition, but increased the overall variability of the deposits.
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