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Recently Introduced Fungicides

    Naturevolume 162page289 (1948) | Download Citation



    LIME-SULPHUR and Bordeaux mixture, both discovered in the last century, are still very effective and relatively cheap sprays for the control of fungus diseases. It is natural, however, to investigate the possibilities of other substances which might be either more effective or more economical. R. W. Marsh has carried out an extensive series of fruit-spraying trials-with various new fungicides (J. Pom. and Hort. Sci., 23, 3 and 4, Dec. 1947). Phenyl mercury chloride was approximately equal to standard lime sulphur for the control of apple scab ; in Grade E oil emulsion, it also gave promising inhibition of sporing of Monilia fructigena. Ferric dimethyldithiocarbamate and tetramethylthiuram disulphide are not phytotoxic, but are inferior as fungicides to lime sulphur. Hepta-decylglyoxalidine equalled lime sulphur for apple scab control, and did not damage sulphur-sensitive varieties. The last substance, with dichlornaphtho-quinone and dithiocarbamate sprays, gave satisfactory control of Pseudopeziza leaf-spot of black currants. Spread of brown rot infection of apples was reduced by ferric dimethyldithiocarbamate; but hydroxy-quinoline sulphate showed no fungicidal value for apple scab.

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