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Second, the incidence of conditions: corn seedlings susceptible to disease in the 5 to 6 leaf stage. August-September is the peak period of corn downy mildew. If there is more rainfall during this period, the relative humidity is high, and the dew is heavy, the incidence is heavier.
Third, the prevention and control methods: (a) combined with the removal of the disease at the beginning of the disease, for chemical control, spray once every 7 to 10 days, and even spray 2 or 3 times. The agent can be used with 25% metalaxyl 800-1000 times, 65% dexamethasone 600 times, 40% phospho-aluminum 250 times.
Corn downy mildew disease symptoms and control methods
First, the harm symptoms: corn downy mildew is a devastating disease. Seed damage, the whole plant leaves were pale green, gradually yellowing and dead as the disease progressed. Injury to adult plants, from the base of the leaves in the middle of the plant, produces pale green to yellowish-green stripes, which continuously spread to the tip of the leaves, turning the leaves into yellow-green, and finally dead. When the rainy weather or dew does not dry, white mold layer can be seen on both sides of the diseased leaf.