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CONCENTRATE SPRAYING OF APPLE TREES I. FUNGICIDAL EFFICIENCY OF LIME‐SULPHUR
Author(s) -
MOORE M. H.
Publication year - 1957
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1957.tb00439.x
Subject(s) - venturia inaequalis , lime , mildew , biology , orange (colour) , apple scab , dilution , horticulture , sulfur , fungicide , powdery mildew , botany , materials science , metallurgy , thermodynamics , paleontology , physics
Experiments are described in which the efficiency of undiluted lime‐sulphur applied as a spray mist of small droplets, formed by and carried in a stream of compressed air, was compared on small Cox's Orange Pippin apple trees with that of diluted lime‐sulphur applied either in the same way or by orthodox hydraulic spraying. The control without spray damage of apple scab ( Venturia inaequalis (Cooke) Wint.) and apple mildew ( Podosphaera leucotricha (Ell. & Everh.) Salm.) was the criterion. The undiluted concentrate proved at least as effective and safe as the hydraulically applied dilute spray when a satisfactory method of application, by a paint spray gun, had been established. A 50% dilution applied in this way at increased volume proved equally effective, but a 10% dilution similarly applied failed to give satis‐factory control of scab, probably because of the reduced dosage.