Wheat sheath blight control method

In the past two decades, wheat sheath blight has generally occurred in the main wheat producing areas in our province, generally reducing production by 10% to 20%, and severe land masses reaching more than 50%. After germination of wheat, the coleoptile became brown, and bad buds died. Qiu Miao returned to the green period and felt sick. There were gray spots on the middle of the leaf sheaths and brown spots on the edges. The leaves gradually became dark green water stains, and later they lost water and dried yellow. Serious death. After the jointing, the elliptic water-stained lesions appeared on the leaf sheaths of the base of the plant. After the jointing, the lesion developed into a grey-like lesion with a gray center and brown edges. The lesions are enlarged and connected to the stems of the flower culms. Main stems and large shoots often fail to head and become dry booting spikes.

Control technology:

I. Selection of mid-resistance and disease-resistant varieties

At present, there is a lack of wheat varieties with high resistance to sheath blight in the current production. In the fall season, varieties with medium resistance, disease resistance, or mild disease and high yield are selected as far as possible.

Second, rational rotation, strengthen field management

Implementation of wheat and rapeseed, soybean, peanut and other crop rotation, to reduce the accumulation of field bacteria. Appropriately reduce the sowing rate, control plant density, and enhance the permeability of wheat fields. Appropriate application of organic fertilizer, balanced application of nitrogen, phosphorus, potassium fertilizer, close planting, timely weeding and drainage, improve the ecological environment of wheat, cultivate strong seedlings, improve disease resistance and compensation.

Third, chemical prevention

Focusing on seed treatment, the severe disease fields in spring will be sprayed with pesticides.

1. Chemical seed dressing. The current application effect is better with 20% triadimefon EC, 25% triadimefon wettable powder, 15% oxytetrazin wettable powder, 12.5% ​​diniconazole suspension, 3% tebuconazole wet mix, etc. The dosage of the agent is 0.02-0.03% of the dry seed amount. 5.5% Soaking Spirit No. 2 Emulsion, 1 g wet mix for every 100 kg of seeds; or 23% Baosui Water Emulsion, 20 g wet mix for every 100 kg of seeds.

2. Spray. For plots with a spring wheat disease strain rate of 20%, spraying should be promptly applied. The spraying time should be in the early stage of jointing of wheat to prevent diseases from invading the stem. Spray can be used in one of the following: 20% triadimefon EC 50ml, 15% or 25% triadimefon Wettable powder 75g or 100g, 15% Triadimefon WP 75-100g , 25% diniconazole wettable powder 50-60 grams or 12.5% ​​diniconazole suspension 100 ml and so on.

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