How to prevent wheat sheath blight? Key points for prevention and control of wheat sheath blight

Symptoms of wheat sheath blight:

(1) rotten bud: the bud sheath is infected and browned, and then the rotten buds die and cannot emerge.

(2) Dead seedlings: mainly occurred in the 3-4 leaf stage of wheat, showing a central gray-white, brown-edged lesion on the first leaf sheath, and a dead seedling due to the inability to extract new leaves.

(3) Stalks of flower stalks: After rejuvenation, the lesions first appeared on the lower leaf sheath, producing a cloud-like lesion with a grayish white color and a light brown edge. The multiple lesions were connected to form a cloud-like flower stalk.

When the conditions are suitable, the lesions expand upwards and extend inward to the stalks of the wheat. On the stalks, there are near-elliptical central taupe, dark brown edges, and slightly "eye spots" at both ends.

When the field humidity is high, the filamentous white mycelium and the yellow-brown sclerotium formed by the entanglement of the mycelium can be seen on the inner side of the diseased leaf sheath and on the stem. The sclerotia is similar to rapeseed and is easy to fall.

Note: The cloud-like lesions and sclerotia on wheat stalks are typical symptoms of the diagnosis and identification of sheath blight.

(4) Lodging: the stem is rotted, and it is easy to fall later.

(5) Withered ears: The main stems and large tillers with severe onset often do not produce spikes, forming "wild ears." Although some can head, but the seed setting rate is low, the grain is thin and thin, forming a "white ear."

Wheat sheath blight control measures

(1) Agricultural measures: 1 planting resistant (resistant) disease varieties; 2 strengthening cultivation management: A. High-yield fields should be added with organic fertilizer to make soil organic matter content greater than 1%; B, balanced application of N, P, K, avoiding large-scale application of N Fertilizer; C, wheat should not be overweight in the returning period, because the seedlings are less chasing or not chasing; D, the seriously diseased plots are suitable for late sowing, controlling the amount of sowing, reasonable close planting; E, do a good job in the "three ditch" of wheat fields; Weeding in time to improve the ecological environment in the field.

(2) Chemical control: 1 seed treatment; 2 chemical spraying prevention: spraying should be carried out in time according to the development of the disease during the period of wheat greening and jointing. Optional medicaments are: 14% per mus of granules (etrazole guansin A) 40 ml, pentose (90% carbendazim + 80% tebuconazole), 43% fulvic acid ( tebuconazole) 12 g, 30% Ai Miao (mellipodazole) 10-15 ml, 23% esteem (epoxe epoxiconazole) 40 ml, 12.5% ​​opal (epoxicycline) 30 ml, 24% Kangmande (thiazide 20 ml of furfuramide, 8 g of pentyl 80 (teproxol) or 6% of 拂Kang (jingjing), 30% to bright (methylene tebuconazole), etc., once every 7-10 days, Even prevent 2-3 times.

Emphasis on the prevention and control of wheat sheath blight:

Early prevention: Seed treatment must be carried out after planting wheat in the future. Seed treatment is the most effective way to prevent sheath blight, which can delay and alleviate the occurrence of diseases.

The second is to apply medicine early after returning to green.

The third is "smart" fight drugs: the dew is not dry to fight drugs, so that the liquid can flow to the base of the stem together with dew to ensure the control effect.

Fourth, try not to use a mister, and increase the amount of water appropriately. This is the key to improving the effectiveness of the control.

Fifth, according to the occurrence of pests and the growth of plants, in the prevention and control of sheath blight, add insecticides and functional foliar fertilizers such as Huilongbao to prevent and cure diseases, improve nutrition and enhance resistance. The opposite effect is half the effort.