Lotus Root Disease Prevention and Control Methods and Key Points for Identifying Common Diseases

Lotus root disease prevention and control refers to the production management steps in lotus root cultivation that comprehensively apply agricultural, biological and chemical measures to prevent or reduce the harm caused by various diseases. Lotus root grows in a shallow-water environment, where high field humidity and relatively high temperatures make it easy for pathogens to reproduce and spread. Once disease breaks out, it often spreads quickly, so prevention and control emphasize prevention first and comprehensive measures.

The common lotus root diseases in production mainly include rhizome rot, brown spot, black spot and leaf blight. Rhizome rot mainly damages the underground stem; after infection, the lotus root body becomes discolored and rots, directly affecting yield and market quality. Brown spot and black spot mostly occur on leaves, and after the lesions expand they cause early leaf withering and weaken plant vigor. In some production areas, viral diseases can also be seen, often appearing as shrunken and deformed leaves and stunted plants.

Agricultural control is the foundation of prevention and control work. Before planting, healthy, disease-free seed lotus roots should be selected and retained, and seed roots should not be kept from severely diseased fields. Reasonable rotation with crops such as rice should be carried out to reduce the accumulation of inoculum in the field. In routine management, diseased plant residues should be removed in time, irrigation and drainage should be managed scientifically, and water quality should be kept clean. In fertilization, attention should be paid to balanced nitrogen, phosphorus and potassium, with increased application of decomposed organic fertilizer, avoiding excessive nitrogen fertilizer that causes excessive vegetative growth and reduced disease resistance.

Chemical control should preferably be carried out in the early stages of disease. Select the appropriate pesticide according to the type of disease, spray or splash it evenly, pay attention to rotating pesticides to delay the development of resistance, and strictly observe the pre-harvest interval, stopping application before harvest. Because lotus root is an edible agricultural product, product safety must also be considered when using pesticides. Strengthening field inspections at ordinary times so that problems are discovered and handled early is an important guarantee for stable yield and high quality in lotus root.