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Studies of spray deposits. I.—Effect of spray supplements on the tenacity of a copper fungicide
Author(s) -
Somers E.
Publication year - 1956
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740070211
Subject(s) - linseed oil , tenacity (mineralogy) , polyvinyl acetate , natural rubber , cellulose acetate , nuclear chemistry , lime , chemistry , materials science , cellulose , food science , organic chemistry , polymer , mineralogy , metallurgy
The influence of 47 materials on the tenacity of cupric oxide on a cellulose acetate surface has been determined. From these screening tests, seven of the most promising stickers, agar, linseed oil, lime casein, polyvinyl acetate (PVA), coumarone resin, rubber latex and polyvinyl chloride (PVC) were used as supplements to cupric oxide in a potato blight field trial. Although most of the supplements increased the tenacity of the cupric oxide, little, if any, improved blight control was observed. Linseed oil and rubber latex were also used as supplements in a field trial on tomato foliage and the copper residue level was determined chemically. The effect of varying the supplement concentration of boiled linseed oil, PVA and rubber latex on the tenacity of cupric oxide on cellulose acetate and bean leaves was determined. The most effective concentrations were the same for both surfaces. Sedimentation analysis showed that both boiled linseed oil and rubber latex flocculated the cupric oxide suspension, whilst PVA at a high concentration increased its dispersibility. Assays in vitro against Alternaria tenuis showed that, of the seven CuO‐supplement treatments listed above, PVC and PVA were the only supplements that did not decrease the fungitoxicity of the cupric oxide. The physico‐chemical aspects of this inhibition are discussed. It is suggested that PVA, at sufficiently high concentration, should prove to be a suitable sticker for copper fungicides.