Maize big spot and small spot disease are the main diseases of corn in Yongsheng County. They are harmful to the local corn production. The harm symptoms and control techniques are as follows:
First, the harm symptoms: the main damage leaves, but also invade leaf sheath and temporal lobe.
1, large spot disease: large and small lesions, spindle-shaped or long spindle, 5-20cm long. In the early stage of the disease, water-stained blue-gray spots quickly developed into large spots with dark brown, dark brown or dark brown edges. There is a distinct dark brown fluffy mildew on the lesion when wet. Several lesions commissure, causing the leaves to die.
2. Small plaques: lesions are few and many, oval or rectangular, brown, lesions about 1cm long, yellow or pale halo circles around the edges. Dozens of lesions culminated in intensive disease periods, resulting in dry leaves.
Second, the pathogen: is a fungus disease caused by the fungus Mycelia spp.
Third, the incidence of the law: susceptible varieties in the high temperature and humidity or weather conditions when the rain is easy to disease; low-lying land, continuous cropping, too densely planted covert incidence is heavier; Booting stage to heading period is easy to disease.
Fourth, prevention and control technology
1. Selection of disease-resistant varieties: selection of varieties such as Yunrui 4, Fuyu 1, and Tuenyu No. 7 with strong disease resistance; 2. Remaining diseased plants to reduce initial infection; 3. Rotation; 4 , rational close planting, good work of cultivating, weeding, earth-cultivation, cleaning of drains, etc.; rational fertilization, adequate base fertilizer, increased application of phosphorus and potash fertilizer, promote plant growth and robustness, and enhance disease resistance; 5, chemical control: generally at the booting stage Start spraying prevention, once a week, spraying 2-3 times in succession, 50% carbendazim WP 500 times, 65% zebra wettable
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