Why is rice bacterial blight easily prevalent after typhoons and rains?

Rice bacterial blight is prone to outbreaks in hot and rainy weather, and typhoons provide conditions for outbreaks.

One of the diseases of rice, yellow-green spots initially appear on the leaf tips and edges of diseased plants, and then develop into pale or yellow-brown stripes along the leaf veins, and finally turn gray-white and die. Diseased plants are prone to lodging and the rate of rice ear failure increases.

The pathogen spreads overwintering on seeds and diseased straw. Disease begins to develop during the tillering stage. High temperatures, high humidity, storms, waterlogging in rice fields and excessive nitrogen fertilizer are conducive to the spread of diseases. The different disease resistances of different varieties can be used for prevention and control. Seeds should be saved from disease-free areas, seeds should be disinfected, diseased rice straw should be removed, reasonable fertilization and shallow water irrigation should be carried out to enhance the disease resistance of rice and the seedlings and fields should be sprayed with ammonium and sterol. Waiting for medicine.

Incidence period:

Bacterial blight can basically occur from the seedling stage to the heading stage of rice. In the seedling stage of rice, the symptoms are not very obvious, or the incidence is rare. When the jointing stage, the disease begins to become serious. In some fields, the disease will occur later, and the disease will not start until the booting stage or the breaching stage, and it will cause The disease occurs first in the lower part and then spreads upward, affecting rice filling and eventually leading to yield reduction.

Whether it is early rice, late rice or single-crop rice, bacterial blight will occur. The severity of the disease will vary depending on the conditions in the field: hot and humid weather, plots that have not been exposed to sunlight for a long time, plots with too much nitrogen fertilizer, plots with too dense planting, etc., will all aggravate bacterial blight. occurrence.