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The time of spraying of fungicides for the control of citrus canker was examined during the growing period of spring and summer twigs.The experiment was designed as follows; a) The spring sprays viz. three times of spraying during the spring twigs and leaves were still soft. b) The summer sprays viz. three times of spraying during the summer twigs and leaves were still soft. c) The spring and summer sprays viz. three times in spring and three times in summer.Three kinds of fungicides (bordeaux mixture, streptomycin, and mixture of streptomycin and mercuric compound) were used in this experiments.It was recognized that the sprays in spring only were more effective than those of summer only. Injury of fungicides on fruits was found in summer especially by bordeaux and mercuric compound. Streptomycin was more effective for the control of canker than the other fungicides.

STUDIES ON THE SPRAY PROGRAM FOR THE CONTROL OF CITRUS CANKER