The high-temperature and rainy season from June to September every year is the peak period of the lotus leaf blight, mainly the young leaves that have just been pumped out and are still floating on the water, and appear dark brown on the leaves or leaf margins Definite wet and rot-like lesions cause the leaves to dark brown rot and die, and the diseased leaves cannot be removed from the water surface, affecting the elongation and starch accumulation of lotus root, reducing the yield and affecting the quality. Therefore, in the summer and autumn, we must pay attention to the prevention and treatment of leaf blight of lotus root to protect the leaves. The specific prevention and control methods are as follows:
During the period of June to September each year, whenever a new leaf is extracted from lotus root, it is necessary to spray 800 times of a 72% solution of cream urea manganese zinc wettable powder, or 700 times of 64% aqueous solution of magnesium adenoyl cadmium wettable powder. Prevent it. If there is a typhoon rain, it is necessary to spray 800 times of 64% anti-virus WP aqueous solution before and after the typhoon rain. Usually pay attention to check the leaves of lotus root and found that there is a dark brown near-circular to indefinite form of wet rot lesions appear, it is necessary to spray 2 to 3 times 2500 times 52.5% oxaclofenac cream Urea Cyanide water dispersible tablets Aqueous solution, or 2000 times 30% aqueous solution of azoxystrobin water dispersible granules, or 800 times 80% mancozeb aqueous solution, or 500 times 70% aqueous solution of calcium aluminum phosphate manganese zinc wettable powder, etc. Spray once every 7 to 10 days and evenly spray all the leaves. If you can add 0.2% ~ 0.3% potassium dihydrogen phosphate aqueous solution or 800 ~ 1000 times Xingpeng phosphorus potassium water solution with the spray, the control effect is better.
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