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Prevention and treatment of micrococcus disease
1. Symptoms The pathogenic bacteria invade the stem base sheath of rice and form oval or spheroidal black spots. Afterwards, it expands to the entire leaf sheath. There are also large black spots on the stem. The roots of the stem are rotted, the plants are blue and dry, and the stem cavity has A large number of small spherical black sclerotia. The mature sclerotia is overwintered on sick straw or in the soil, and adheres to the base of the seedling when it is planted, invading from the base of the wound or sheath. The pathogens are like high temperature and high humidity, so the damage in the ear stage is heavier than that in the early stage. The plots with more rice planthoppers are heavier, and often cause mixed infection. Second, the prevention and control methods to strengthen water and fertilizer management, shallow ground irrigation, timely field, post-injection horse water, to prevent premature water. Apply more organic fertilizer, increase phosphorus, potassium fertilizer, especially potassium fertilizer, avoid partial nitrogen fertilizer. The diseased straw should be bred at high temperatures, and it must be cut into mud to cut rice. Conditional implementation of dry and dry rotation. Transfer sclerotia before transplanting to reduce the source of bacteria. Chemical control should be sprayed at the jointing stage and booting stage of rice with 40% of Fuji No. 1 Emulsion 1000 times, or 5% of Jinggangmycin Aqueous Solution 1000 times, 70% of thiophanate-methyl WP 1000 times, 50 % of carbendazim WP 800 times. (Researcher of Institute of Grain Crops, Provincial Academy of Agricultural Sciences)