Recent Experience in Timing Sprays for Control of Apple Scab: Equipment and Test Results

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Abstract
Two weather monitoring instruments developed for use in commercial orchards were used to detect infection periods of apple scab in Maine and New Hampshire [USA]. Eradicant treatments using nonregistered fungicides were as effective in controlling leaf and fruit scab as registered and nonregistered protectant treatments. Three sprays were saved using the eradicant spray program. An experimental spore trap, developed for use in detecting Venturia inaequalis ascospores, was tested in a wind tunnel against a recording volumetric spore trap and in 3 commercial orchards with low inoculum levels. The experimental unit trapped ascospores at .apprx. 65% of the efficiency of the recording volumetric spore trap. Ascospores were detected during only 1 wetness period in each commercial orchard.

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