Corn Curvularia leaf spot, also known as maculopathy, has been on the rise in recent years, especially in Dandan 20. If you do not pay attention to prevention and control, affect photosynthesis, thereby reducing corn production.
1 symptoms
The disease mainly damages the leaves, but it can also damage the leaf sheath and the temporal lobe. Typical lesions are round or oval, 1 to 2 mm in size, with white or yellowish brown in the middle, dark brown edges, and light yellow halos around them. When the humidity is high, both sides of the diseased area can produce gray mold layer.
2 the law of incidence
The disease is a fungal disease and the pathogen is Curvularia sp. The pathogenic bacteria overwintered with conidia and mycelia in the soil, the plant's diseased body and diseased stalks. The second year of conidia was transmitted to corn plants under suitable conditions, and invaded the body to cause initial infection; after the onset of disease, a large number of conidia generated in the diseased part could cause multiple reinfections due to wind and rain, airflow. The high temperature, high humidity, and rainy weather conditions in July and August in Funan County are conducive to the occurrence of this disease.
Heavier disease.
3 control methods
3.1 plant resistant varieties. Such as Zhongdan No.2, Dandan No.22, Danyu No.13, Shandan l2, and Dandan 19,etc.
3.2 strengthen the cultivation and management. Corn and legumes, vegetables and other crops were turned down; appropriate early sowing; timely disposal of the diseased bodies after harvest; sufficient base fertilizer and reasonable top dressing.
3.3 Chemical control. At the beginning of the disease, 40% of Fuxing Emulsion can be used for 8000 times, or 50% of Suo Ke Ling's WP can be used as 2000 times, or 12.5% ​​of Gluconidone can be used as a 3,000 times, or 25% can be used to de-emulsify 1000 times of oil. Or 80% of large wettable powder 1000 times spray control. Spray once every 10 days or so, 2 or 3 times in a row.
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