Answer: The corn silk black tassel disease bacterium (spore pile black powder fungus) to scatter in the soil, mixed with manure or adhering to the seed surface of the winter spore overwintering, become the next year's primary source of infestation, which the soil with the bacteria in the infestation cycle is the most important. Overwintering winter spores produce infestation filaments by sexual union, and invade from young corn shoots and shoot sheaths, embryonic axes, or young roots after corn is sown. Corn is primarily infested by the pathogen until the 3-leaf stage, and the pathogen does not reinfest corn after the 7-leaf stage. The pathogen that invades corn quickly spreads to the growth cone of corn, expanding with mycelium as the corn grows, and the pathogen enters the buds and primordial ears causing systemic infestation when the male and female ears of corn are differentiated. Disease mycelium in the female and male ears to form a large number of black powder (winter spores). Silk Spike Disease does not re-infest and is a single-cycle disease that is prevalent year after year.

The prevention and control strategy should be based on seed treatment, planting disease-resistant varieties, and timely elimination of the fungus source of integrated control measures.

(1) Plant disease-resistant varieties.

(2) Eliminate and reduce the source of the initial infestation. ① Prohibit the transfer of seeds from the diseased area. ② High-temperature composting, stable manure reasonable pile, high-temperature fermentation, kill germs before use. ③Select the field that does not carry bacteria or after soil sterilization seedlings, corn seedlings to 3 or 4 leaves before transplanting in the field. ④Pull out the diseased plants in time. ⑤Reasonable crop rotation.

(3) Seed treatment: sunshine seeds before sowing, and select seeds with full grains, pure varieties, high germination rate, strong germination potential, and then use chemicals for seed treatment.

(4) Strengthen cultivation management. ①Adjust the sowing period. Require the temperature to stabilize above 12 ℃ at the time of sowing. ② Improve the quality of sowing. Do a good job of preparing the ground to preserve moisture, according to soil moisture appropriate shallow sowing, point of water sowing or take advantage of the moisture to grab seed. ③ Cover the film. After sowing, cover the film, improve soil temperature, accelerate the speed of corn seedlings, shorten the susceptibility period of corn.