Occurrence and Control of Maize Big Spot

The occurrence conditions of corn big spot disease: 1. The degree of disease is mainly determined by temperature and rain. Therefore, in the period of July-August, if the temperature is low, it is rainy and humid, and there is not enough sunshine, it will be conducive to the occurrence and spread of the disease. 2. Tillage and cultivation measures: The corn crops are seriously diseased, the crop rotation is light, and the single crops are seriously ill and the intercropping is light. In addition, cultivated dense corn plots are heavier than cultivated scarce plots.

Symptoms of Injury: Maize leaf spot mainly damages the leaves, and in severe cases it also damages the leaf sheath and temporal lobe. It begins with the lower leaves of the plant and expands upward. The lesions are long spindle-shaped, gray-brown or tan-colored, 5 to 10 cm in length and 1 cm in width. Some lesions are larger, or several lesions are connected to a large, irregular spot, and the leaves are severely charred. In rainy and wet weather, gray moldy layer (ie, pathogenic spores) can be densely stained on the lesions. In addition, there is a lesion that occurs on disease-resistant varieties, spreading along the veins, showing a brown necrotic streak, surrounded by yellow or light brown.

Prevention and control measures: The prevention and control of corn leaf spot disease should adopt comprehensive measures such as selection of resistant and disease-resistant varieties, strengthening cultivation and management, and focusing on pesticide application and protection.

The first is cultivation and management measures.

(1) Selection of corn hybrids resistant to and resistant to large spot disease.

(2) Implement crop rotation and dumping system to avoid continuous cropping of corn, deep-fall soil in autumn, remove diseased plants and eliminate the source of sterilization; Corn stalks used as fuel can be used to treat corn borer after opening and early spring; waste residues should be used as compost. Full maturity, it is best not to apply straw fertilizer in corn.

(3) Improve cultivation techniques and increase corn disease resistance. Interplanting with peanuts, potatoes, etc., or wide-narrow rows can reduce the incidence; rational irrigation, and pay attention to field drainage.

The second is chemical control.

Start spraying before and after corn picking. 50% carbendazim WP, 75% chlorothalonil wettable powder, 80% Mancozeb WP can be used to spray 500 times, 50-75 kg per mu. Spray once every 7-10 days for a total of 2-3 times.

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