Symptoms and control techniques of wheat leaf blight

Symptoms of the disease; wheat leaf blight mostly occurs in the heading stage of wheat, mainly affecting the leaves and leaf sheaths. The leaves of the first disease grow oval-yellow to pale green spots, which rapidly expand and form irregular yellow-white to yellow. Large brown plaques generally begin to develop from the lower leaves and gradually develop upward. In late autumn and early spring, the bacteria invade the root canopy of the host, and the lower leaves die, causing the plants to weaken and even die. The lesions in the stem and ear are less obvious and much smaller than the leaf lesions. Conidia are also rare.

Morphological characteristics; the conidia are spherical to oblate, the wall is brown to black, and the orifice is slightly protruding. Often produced in the stomata under the host epidermal tissue. Two conidia of size are produced in the spore. Large spores are slender and colorless. There 3--7 diaphragms, circular ends; microspores without diaphragm, microbending, colorless.

The characteristics of the disease; in the winter wheat area, the pathogens on the wheat residue or on the seeds over the summer, the autumn began to invade the seedlings, and the main body of the bacteria died in winter. In the spring of the next year, the pathogens produce conidia transmission; in the spring wheat area, the conidia and mycelium of the bacteria overwinter on the wheat residue, and the conidia spread after the spring wheat planting in the spring of next year. It is advantageous for the spread of this disease under conditions of low temperature and high humidity. There is a big difference in disease resistance between the varieties on leaf blight.

Control method:

1. Select disease-free seeds and plant them in appropriate amount; apply sufficient base fertilizer, NPK to control the density of field population, improve ventilation and light transmission conditions;

2 , seed treatment: seed dressing with 0.2% - 0.3% of 50% thiram double wettable powder or 33% of moldy WP can be seeded at a seed weight of 0.2% .

3, the wheat filling stage to flowering stage is a critical period blight Control: 12.5% diniconazole mu WP 25--30 grams or 20% of triadimefon EC 100 ml of 50 kg of water evenly spraying; 50 % carbendazim WP 1000 times or 50% thiophanate-methyl WP 1000 times or 75% WP chlorothalonil 500--600 times or 50% iprodione WP 1500 times spray. Disease prevention and control, as the field 1--2 times.

Source: Xihua County Agricultural Bureau, Henan Province

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