First, the symptoms of blight: At the seedling stage, the young shoots are sometimes discolored, the leaves snoring, and finally they die and spread rapidly.
Control measures: Bacterial blight pathogens survive in the soil. The occurrence of blight is closely related to climate, seedbed temperature, soil pH, fertilizer and other environmental conditions. Dry seedlings are prone to occur after low temperature in cold wave; more sowing quantity, poor management, high seedbed temperature, and prone to seedlings tend to occur; seedbed soil is more alkaline or neutral; fertilization is improper, especially human urine, urea, grass ash, Alkaline soil and other alkaline fertilizers are prone to occur. Prevention and control of rice blight should be based on prevention, create favorable conditions for promoting the development of rice roots, strengthen seedbed management, control seedlings grow, foster broth, enhance plant resistance to disease. At the same time, it must also cooperate with soil acidification and chemical control measures. After the onset of blight, 50% of the enemy with 75 grams of 75 grams plus 77% can kill 75 grams of watered 90 to 100 kg spray.
Second, the symptoms of bacterial wilt: leaves snoring, turning green and gradually withered.
Because seedlings are too long and their roots are not well developed, when the leaves are thawed, the transpiration of the leaves is accelerated and the roots do not absorb enough water or the absorption is poor, resulting in dehydration and snoring of the leaves. Or because of uneven bed spacing, the roots cannot absorb water to form physiological water. Or the seedlings are subjected to a strong low temperature, their protoplasms are destroyed, the permeability increases and the water holding capacity is reduced. When the cold warms up, the temperature difference is too large, the transpiration of the leaves is strengthened, and the soil temperature is low. The low water absorption causes the physiological water loss to form blue and dry.
Control measures: Nitrogen fertilizer should not be too much. It is necessary to temper the seedlings according to the weather and improve the seedling quality.
Third, the symptoms of bakanae disease: The most obvious feature is the slender, yellowish color.
Prevention and control measures: Bacillus officinale is spread by seeds, the seed with bacteria is the source of bastard disease infection, and the strict implementation of seed disinfection is an effective measure to prevent and cure this disease.
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