Pharmacodynamic test for prevention and control of potato late blight with 50% mancozeb-flumorph WP.

Pharmacodynamic test was carried on to find the effect and safety of prevention and control of potato late blight with 50% mancozeb·flumorph WP in the consecutive 2-year.The field trial results showed that the late blight of potato could be effectively controlled by continuous spraying for three times at the dosage of 1200-1600g.ha-1 of 50% mancozeb.flumorph WP,and at an interval of 7-10 days in the initial infection period.The control effect of disease reached 79.5%-84.3%,which was safe to potato.