Yellow (white) disease
1, the symptoms of the disease. The new leaf color fades and turns yellow, severe whitening, does not roll leaves, but the leaves are thin; the old leaves are normal at the beginning of the disease, and then gradually turn yellow; the roots become brown and the absorption function declines. Alkaline soil is prone to such diseases.
2, prevention and treatment methods. (1) Soil fertility: more fully fermented organic fertilizer, no application of plant ash, less application of phosphate fertilizer, in areas where the pH is neutral or slightly acidic, the bed soil can be adjusted with dilute sulfuric acid, and the bed soil pH Adjusting to 4.5-6 is beneficial to alleviate the occurrence of this disease. (2) Chemical control: When the seedlings appear yellow (white) disease, the spray of 0.2% ferrous sulfate has a certain effect. It is also possible to spray "Mr. Hybrid Green No. 1", and green spots appear on the yellow leaves 24 hours after spraying. After a few days, the whole leaves turn green, and the roots also restore absorption function.
Blight
1, the symptoms of the disease. Mainly manifested as brown roots, black root yellow seedlings, rotten buds, and dead and dead seedlings. In the seedbed, the obvious center of the disease can often be seen, and the expansion is rapid. If it is not timely prevented, it will cause a piece of dead seedling in a short period of time.
2, prevention and treatment methods. (1) Implement a rotation or use a new field. (2) Chemical control. It can be sprayed with 2g of 50% dikesone 2kg per square meter in 2 leaves and 1 heart period. Please avoid mixing with alkaline pesticides, and use them together to avoid alkali decomposition and photodecomposition failure. In addition, Drought Green No. 2, Licumjing, and Moldy Mildew also have certain control effects.
Malignant disease
1, the symptoms of the disease. The seedling stage is the most common type, which is more than 1/3 higher than the normal seedling. The pseudo stems and leaves are slender and the seedlings are yellowish. Often japonica rice is heavier than japonica rice, and dry nursery is more serious than water. After tampering with phlegm and phlegm, the disease has rapidly increased to one of the main diseases in rice seedlings.
2, prevention and treatment methods. Soaking seeds, seed dressing or coating with chemicals is the simplest and most effective way to prevent disease. Soaking seeds with 901 rice seed disinfectant, Shi Baoke, and soaking seeds can effectively prevent the occurrence of mite.
1, the symptoms of the disease. The new leaf color fades and turns yellow, severe whitening, does not roll leaves, but the leaves are thin; the old leaves are normal at the beginning of the disease, and then gradually turn yellow; the roots become brown and the absorption function declines. Alkaline soil is prone to such diseases.
2, prevention and treatment methods. (1) Soil fertility: more fully fermented organic fertilizer, no application of plant ash, less application of phosphate fertilizer, in areas where the pH is neutral or slightly acidic, the bed soil can be adjusted with dilute sulfuric acid, and the bed soil pH Adjusting to 4.5-6 is beneficial to alleviate the occurrence of this disease. (2) Chemical control: When the seedlings appear yellow (white) disease, the spray of 0.2% ferrous sulfate has a certain effect. It is also possible to spray "Mr. Hybrid Green No. 1", and green spots appear on the yellow leaves 24 hours after spraying. After a few days, the whole leaves turn green, and the roots also restore absorption function.
Blight
1, the symptoms of the disease. Mainly manifested as brown roots, black root yellow seedlings, rotten buds, and dead and dead seedlings. In the seedbed, the obvious center of the disease can often be seen, and the expansion is rapid. If it is not timely prevented, it will cause a piece of dead seedling in a short period of time.
2, prevention and treatment methods. (1) Implement a rotation or use a new field. (2) Chemical control. It can be sprayed with 2g of 50% dikesone 2kg per square meter in 2 leaves and 1 heart period. Please avoid mixing with alkaline pesticides, and use them together to avoid alkali decomposition and photodecomposition failure. In addition, Drought Green No. 2, Licumjing, and Moldy Mildew also have certain control effects.
Malignant disease
1, the symptoms of the disease. The seedling stage is the most common type, which is more than 1/3 higher than the normal seedling. The pseudo stems and leaves are slender and the seedlings are yellowish. Often japonica rice is heavier than japonica rice, and dry nursery is more serious than water. After tampering with phlegm and phlegm, the disease has rapidly increased to one of the main diseases in rice seedlings.
2, prevention and treatment methods. Soaking seeds, seed dressing or coating with chemicals is the simplest and most effective way to prevent disease. Soaking seeds with 901 rice seed disinfectant, Shi Baoke, and soaking seeds can effectively prevent the occurrence of mite.
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