Symptoms: The rice booting stage occurs on flag leaf sheaths. At the beginning, it was a small dark brown patch, which later expanded into a large irregular patch of tiger skin with dark brown or dark brown edges and lighter middle colours. In severe cases, lesions spread throughout the leaf sheath, causing all or some of the young panicles to spoil. All glume in the early stage of heading is green, and the glume in the upper part of the ear is still green, while the lower glume is brown and the glume is full of panicles. brown. Without heading or half heading and stripping of the ear blast, pink mold was observed on the inner surface of the glume and leaf sheath.
Prevention and control measures: 1, selection of disease-resistant, high-yield, high-quality rice varieties. It has been identified that there are no immune cultivars in Heilongjiang Province, but the varietal resistance varies widely. 2, the reasonable application of nitrogen, phosphorus, potassium fertilizer, nitrogen fertilizer dosage should not be too much, it should not be too little. 3, chemical control. At the earliest stages of booting and at the end of booting, 43% tebuconazole suspension, or 25% prochloraz, 50% carbendazim WP, or 70% thiophanate-methyl WP, 70% Kitobutzine wettable powder and other agents.
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