Abstract
AbstractA two‐season trial of a mist blower‐sprayer with improved air‐flow characteristics was made to assess the relative efficiency of 120 and 180 μm mass median diameter (MMD) drop‐size sprays for the control of apple powdery mildew (Podosphaera leucotricha) and fruit tree red spider mite (Panonychus ulmi Koch) in a hedgerow‐type apple orchard. The principal pesticide was binapacryl, applied at two rates for each drop‐size. Under typical commercial conditions the smaller drop‐size approximately halved the incidence of apple mildew found when the conventional 180 μm MMD drop‐size spray was used; there was no conclusive advantage against red spider mite. Unexpectedly large variations occurred in the deposits from the weekly applications and were related to the humidity during spraying.
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