The downy mildew disease should be cleared in time after harvest, and the diseased plants should be burned in a concentrated manner; the rotation should be carried out to remove the water in time; at the beginning of the disease, 1:1:100 Bordeaux mixture or 65% zein zinc WP can be used to spray 500 times. Control, spray once every 7 days, even spray 2-3 times.
Sclerotinia prevention and control method is to carry out rotation, early application of additional phosphorus and potassium fertilizers, enhance disease resistance, reduce humidity, drainage and prevent flooding, the use of sulfur compounds in the roots of plants.
The root rot control method is to spray 50% carbendazim 100 times solution or 70% thiophanate-methyl 1000 times solution at the beginning of the disease, and pull out the diseased plant or irrigate 1:1:100 times Bordeaux mixture. And timely rule out the water in the field to prevent the occurrence and spread of diseases.
The control method of Pieris rapae is to use 90% trichlorfon 800 times spray to prevent and control in the larval instar period. Control locusts with 40% Dimethoate 800 times or 1000 times spray.
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