Field Efficacy of 27.12% Copper Sulfate Basic SC Against Climate Spot Disease of Tobacco

The efficacy of copper sulfate basic SC at different dosage was determined with field experiments.The results showed that the control efficacy of 27.12% copper sulfate basic SC against the climate spot disease of tobacco ranged from 53.68 to 65.60%,which was much higher than that of 80% zineb WP.It is appropriate to apply at the initial stage of disease occurrence for 2-3 times at 7-10 days intervals,suitable dosage is 60 L/667m² at a dilution of 600.