First, lotus root disease: also known as black root disease, mites. It is the first major disease in the production of lotus root, and it is generally susceptible to disease in the old paddy fields and continuous cropping fields with shallow and shallow layers of cultivation, which will affect the yield and reduce yield. It is a disease of lotus root which is caused by the infection of cysts and stems. It mainly damages underground stems, aboveground leaves and foliage. The second is that lotus leaf blight is the second most serious disease on lotus root, and the pathogen is the pathogenic fungus of the monofilament genus. The main damage to the lotus leaf, the lotus leaf edge first appears pale yellow lesions, and then gradually spread to the middle of the leaves, yellow-brown, and finally expanded from the leaf marrow to the veins, until the whole leaf withered. High temperature and rainy, favorable disease, insufficient fertility in Putian, serious diseases. The third is that the leaf spot of lotus leaf mainly damages the leaves, and sometimes it can also occur on the petiole, which is caused by the damage of pathogenic fungi of the genus Rodius. Prevention methods. Before planting, the plants were sprayed with 70% thiophanate-methyl 1000-fold or 75% chlorothalonil 800-fold, and the cover film was sealed for 24 hours and allowed to air dry before planting. In the early stage of disease, 75% chlorothalonil 0.5 kg, 65% dexage 0.5 kg, 30 kg of soil and mix well and throw in shallow water, 70% thiophanate-methyl 1000 times, 65% zeocin 600 Double liquid or 1:1:160-200 Bordeaux spray control, generally every 10-5 days spray once, even spray 2-3 times. Laboratory Plastic Consumables Laboratory Plastic Consumables,Disposable Plastic Test Tubes,Test Tube Racks Ps Material,Cylindrical Bottom Plastic Test Tubes Yancheng Rongtai Labware Co.,Ltd , https://www.shtestlab.com