Corn leaf spot disease can be divided into corn leaf spot and leaf spot disease, which is the main disease of corn production area in China in recent years.
Symptoms: The main damage to the leaves, and sometimes occurs in leaf sheaths and old leaves. The lesions are mostly caused by the middle and lower leaves and gradually spread upward. In severe cases, the leaves quickly dry up, causing the plants to dry and die prematurely, affecting the grouting, and reducing the yield by up to 15? At 30%, the margins of lesions of large patch were not obvious, showing a blue-grey spindle. Sometimes several lesions are linked together into irregular shapes, up to tens of centimeters in length. When wet, the lesion grows a lot of black mold-like conidia of pathogenic bacteria. The lesions of small spot are small and numerous. The general length is not more than 1 cm. The width is limited to the two-leaf veins. The edge near the oval is more obvious. The auburn center is nearly tan, sometimes with 2 to 3 concentric rings, and a small amount of grey black mold can also be produced when wet. Control methods: The main selection of disease-resistant varieties and chemical control. Spraying effective protective agents mainly include: 65% 500% foxedron zinc spray, 50% carbendazim, 50% thiophanate 500 to 800 times spray and so on.
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