Symptoms of this disease mainly affect the leaves. The damaged leaves first appeared watery stained brown spots from the tips of the leaves and leaves, then expanded downwards and inwards, and the lesions expanded in a corrugated manner. During the wet period, the diseased department was brownish and wet, and the boundary between the diseased and healthy parts was not clear; when the disease was dry, the diseased part was yellow-brown to gray-brown, and the boundary between the diseased and healthy parts was distinct. The common wavy brown lines at the back of the dead leaves resemble the texture of the longitudinally cut pine, which is the most typical feature of the pathology of the disease. Symptoms of the disease are generally not obvious, but after moisturizing, a thin layer of gray and white mold is seen on the surface of the lesion. This is the spore and conidia of the asexual stage of the disease. After 4-5 days, small black spots of needle-like protrusions are also seen on the old diseased part, which is the ascostic shell of the sexual stage of the disease.
Control methods (1) Breeding and changing varieties of disease-resistant seed and disinfecting seeds (see rice blast disease). (2) Ingeniously use fertilizer and water according to the rules of rice planting, so that the seedlings are normal in color and improve the resistance of plants. (3) Strengthen the inspection and timely spray insecticide to prevent disease. From the end of childbirth, two-to-three treatments were applied according to the insect pest, disease condition and weather conditions of rice blast horses. Mild disease fields can be applied to black and white ash (15 to 20 kilograms of lime and 15 to 20 kilograms of plant ash); severe disease fields can be sprayed with colloidal sulfur 150 times, or 20% lime sulfur paste 150 times, or 40%. Oxazolones carbendazim WP 750 ~ 1000 times. In addition, an effective agent for rice blast also has a preventive effect on this disease.
Control methods (1) Breeding and changing varieties of disease-resistant seed and disinfecting seeds (see rice blast disease). (2) Ingeniously use fertilizer and water according to the rules of rice planting, so that the seedlings are normal in color and improve the resistance of plants. (3) Strengthen the inspection and timely spray insecticide to prevent disease. From the end of childbirth, two-to-three treatments were applied according to the insect pest, disease condition and weather conditions of rice blast horses. Mild disease fields can be applied to black and white ash (15 to 20 kilograms of lime and 15 to 20 kilograms of plant ash); severe disease fields can be sprayed with colloidal sulfur 150 times, or 20% lime sulfur paste 150 times, or 40%. Oxazolones carbendazim WP 750 ~ 1000 times. In addition, an effective agent for rice blast also has a preventive effect on this disease.
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