Amaranth disease often causes death above the disease department, and timely pesticide control is necessary. China Pesticide Network Xiaobian gives you advice to prevent and control leek disease:
Symptom analysis: The leaves of amaranth plague develop round to irregular water-immersed plaques, and then expand into elliptical to irregular light brown spots, with water-immersed halos at the edges, petiole, leaves and heart leaves when the disease is severe The chlorotic dying, the elliptic water-immersed plaque is formed in the initial stage of the stem, and then spreads up and down. The diseased part is wet and rot, and the diseased plant is easy to fall, often causing death above the diseased part.
Pathogens and occurrence rules:
Phytophthora nicorianae is called Phytophthora nicotiana and belongs to the genus Fusarium. The pathogens mainly use oospores and chlamydospores to survive the soil in the soil with the diseased residues. The cultivation of soil in the greenhouse is easy to accumulate water, the planting density is large, the management is extensive, and the flooding is often carried out. The wind is not timely, the air volume is small, the open field is cultivated, the rain is more, and the disease is heavier.
Control method:
Choose soil with relatively loose soil, cultivate sufficient and fully decomposed organic fertilizer, protect cultivated cultivation, pay attention to planting density, strengthen fertilizer and water management, promote plant growth, enhance disease resistance, choose sunny when pouring water, add water after watering Large amount of air release; open field cultivation, timely discharge of water in the field after the rain, timely clearing out the diseased bodies in the field and bringing out the destruction outside the field.
Before the onset to the early stage of the disease, the following pesticides can be used for prevention and treatment: 687.5g/L, chlorfenapyr hydrochloride, fluopyram suspension, 800-1200 times solution; 25% bispropionamide suspension, 1000-1500 times solution 25% pyraclostrobin emulsion 1500-2000 times liquid; 50% ether oxystrox dry suspension 3000-4000 times liquid; 70% props zinc wettable powder 600-800 times liquid; 66.8% propyl isopropyl Insecticide wettable powder 600-800 times liquid; 68% fine nail cream · manganese zinc water dispersible granule 800-1000 times liquid; 20% flumorpholine wettable powder 600-800 times liquid + 70% mancozeb wettability Powder 600-800 times liquid;
Tips for pesticide network : When spraying, depending on the condition, it will be taken 7 to 10 times, for 2-3 times.
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