The leaf spot diseases that occur in the corn growing season include: large leaf spot, small spot disease, and brown spot disease. Grey spot disease, Curvularia spp., leaf spot disease, rust disease, and anthrax disease may occur in some areas.
Differentiating several diseases can focus on the following aspects. The first is the size and shape of the lesion. The largest spot of corn leaf spot disease, long spindle, 5 to 10 cm long, single lesions of other diseases are relatively small, such as small spot lesions only 1 to 2 cm, gray leaf spot and Curvularia The spot length of mold leaf spot is 0.5 mm to 3 cm. It is elliptical. The spots of rust and anthracnose are only a few millimeters. However, what we often see is that several lesions heal together and their shapes and sizes are irregular. Seen from the color of the lesions, the brown spot is the darkest, brown or purple brown, the rust spores are brownish yellow, the gray spot is light grey, and the later becomes gray-brown or yellow-brown, and the others are mostly lesions. Withered white, dark brown edges, light yellow halos around. In the later stages of growth, the disease can produce organs that spread diseases. For example, anthrax lesions grow many small black spots (which can produce conidia), rust disease emits yellow-brown powder (Sporisorium spp.), and brown spots. The tissue ruptured and brown powder (dwelling sporangia) was dispersed. When the weather was wet, the back of the lesions grew on the back of the mold layer with different colors. The black spots were black, the brown spots were brown, and the gray spot disease was. Gray.
The occurrence of several diseases is generally similar. The pathogens all overwinter through disease and debris, and are transmitted through wind and rain. Diseases generally start from the lower leaves, and high temperature and high humidity are conducive to disease epidemics. Therefore, we can adopt the following measures to prevent and control: selection of disease-resistant varieties; removal of diseased plant debris, including the early disease removal of the lower diseased leaves, harvesting seasons to clear the field of straw and deep plowing eradication; implementation of crop rotation, reasonable close planting, timely sowing, increase organic fertilizer , to improve the level of cultivation and management; timely initiation of drug control. The following agents can be used interchangeably: 50% carbendazim WP 500 to 600 times, 75% chlorothalonil wettable powder 600 to 800 times, 65% dexamethasone WP 400 to 500 times, and A Thiophanate-methyl (thiophanate-methyl), propiconazole, carbazide (Ego), chlorobalon (Chrysene, sapphire) and other agents.
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