Occurrence and Control of Corn Leaf Spot

In the growing season of corn, leaf spot disease mainly includes large leaf spot, small spot disease, and brown spot disease. Gray spot disease, leaf spot disease caused by Curvularia spp., rust, and anthracnose 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 spot disease, spindle-long, 5-10 cm long. Single lesions of several other diseases are relatively small, such as small lesions of only 1-2 cm in length, and spot lengths of 0.5-3 cm in gray spot disease and Curvularia spp., which are oval in shape. The rust and anthrax lesions are smaller, only a few millimeters. However, what we often see is that several lesions heal together and their shapes and sizes are irregular.

Secondly, from the color of lesions, the brown spot is the deepest, brown or purple brown; the rust spores are brownish yellow, the gray spot is grayish gray, and later becomes grayish-brown or yellow-brown; others are mostly lesions. The middle of the white, dark brown edges, surrounded by light yellow halos. In the later stages of growth, lesions can produce organs that spread diseases. For example, in the lesions of anthrax, many small black spots grow. In the rust, yellow-brown powder (hemospore powder) is emitted. The brown spot tissue ruptures, and brownish spots are scattered. Powder (resting sporangia).

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, the following measures can be uniformly adopted to prevent and control. 1Select disease-resistant varieties; 2Removal of diseased plant residues, including removal of diseased leaves in the early stage of disease, removal of field crops in the harvest season and deep plowing; 3Rooting, rational planting, early sowing, timely application of organic fertilizer, and improvement of cultivation management ;4In the early stage of disease, take chemical control in time.

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