Abstract
Abstract A novel, spinning‐brush very low volume pesticide applicator was designed and tested. Spray characteristics of the brush applicator were comparable with those of knapsack sprayers. The volume median diameter (v.m.d.) of droplets delivered by the brush applicator was 187 μm, the v.m.d.‐number median diameter (n.m.d.) ratio was 2.07, and the spray deposit had a mean density of 43.1 droplets/cm2. The spray deposit across two swath widths had a coefficient of uniformity (CU) of 94.3% and a coefficient of variation (CV) of 18.7% compared with 92.7–97.6% CU and 11.2–36.3% CV for knapsack sprayers. The average rotational speed of the brush atomizer was 239.1 rpm, corresponding to the average speed of 62 rpm of the drive gear. The brush applicator has a 1‐m swath and allows the operator to walk ahead of the spray. Its use is less tiresome than a knapsack sprayer. The brush applicator requires 6 man‐h and 12–15 litres of water to cover 1 ha, and is as effective as a knapsack sprayer in controlling weeds. ...
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