Abstract
SUMMARY Field tests made in 1934, 1935 and 1936, using the control of potato blight as a criterion, showed that fungicidal powers were common to a wide range of copper compounds, namely, cuprous oxide, cupric oxide, cuprous cyanide, cuprous sulphite, cupric phosphate, cupric ammonium silicate and cupric oxychloride. Both cuprous and cupric oxides were inferior in tenacity on potato foliage to Bordeaux mixture but the residues left on the leaves were superior in fungicidal power to Bordeaux residues of the same copper content. In a field trial on pears, cuprous cyanide proved slightly inferior to an oil‐Bordeaux‐arsenate spray of similar copper content, when tested for the control of pear scab. On apples, cuprous cyanide showed pronounced phytocidal properties.
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