Corn smut
2018-07-01 00:00:39
Maize can occur from the seedling stage to the heading stage, and it is heavier in the late jointing stage to the flowering stage. Any young tissue of a maize plant can develop disease, resulting in tumors of different sizes and shapes. The tumors on leaves and male flowers are smaller, generally only bean size, and the tumors on the ear, root and stem sections are large from large eggs to large fists. At the beginning of the tumor, the outer surface was covered with a white film formed by the epidermis of the host. In the later period, the tumor was filled with black powder, and finally the membrane ruptured and black powder was scattered. The ear can be affected by all or part of the grain. Tassels can produce tumors when they are victimized, and they can also cause metamorphosis with bisexual flowers. The bacteria activity temperature is 8 to 38°C and the optimum humidity is 26 to 34°C. The pathogens in the soil and the diseased body are overwintering, mainly in soil. [Control method] 1. Early excision of tumors is often checked, and tumors are found and excised as soon as possible. The tumor's chassis is scratched with a knife and painted with thin mud, which eliminates the disease and is as strong as usual. 2. Select resistant varieties 3. Pest control attention to corn borer, reduce the chance of wound infection. When doing field work, minimize mechanical damage. 4. Reasonable fertilization to avoid the simple application of nitrogen fertilizer, resulting in too young plant tissue. Appropriate application of phosphorus and potassium fertilizers, enhance disease resistance. 5. Drug control (1) Seed dressing 135% phenanthrene powder 150 g seed dressing 50 kg. 225% triadimefon wettable powder 200 g seed dressing 50 kg, control effect of more than 78%. (2) Soaking Seeds for 0.1% Antibacterial Agent 401 for 48 hours. (3) Spraying 1% Bordeaux mixture has a certain control effect at the seedling stage.
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