Identification and Prevention of Large and Small Spots in Maize

In recent years, large and small corn spots have continued to occur in corn fields in parts of our province. The onset period is from before and after corn tasseling to harvesting, which causes a large reduction in corn yield, which affects the increase of corn yield and economic efficiency. Therefore, farmers are reminded to pay attention to it.

Symptoms of the onset of symptoms of corn, small spots are similar, often mixed in the field. It mainly damages the leaves. In severe cases, leaf sheaths and loquat leaves are also damaged. The whole growth period can be disease, heavier after heading. Blotch disease: Generally originating in the lower leaves, the leaves are initially infected with small gray-green spots, and after expansion, they become dark-brown, central-brown shuttle-shaped large spots. When the weather was wet, the lesions formed large patches. The surface of the leaves had a layer of black mold. In severe cases, the lesions split longitudinally and the leaves died. Small spot: the lesions are small and numerous, grayish-brown, oval, with purple edges; sometimes the lesions have rims and the edges are not obvious; in some high-resistance varieties, the lesions are yellow-brown necrotic dots that do not expand. The mold layer was also grown under high temperature and high humidity conditions, but no large spot disease was apparent.

Prevention and control measures First, the removal of the lower diseased leaves and removal of diseased bodies can effectively reduce the infection of field bacteria. The second is to strengthen the cultivation and management of the field, apply sufficient basal fertilizer, increase the application of phosphorus and potassium fertilizers, and do a good job of cultivating and weeding and earth-cultivation, and improve resistance. The third is to take reasonable time to spray the drug, that is, at the beginning of the disease, use 20% triadimefon 1500 times, or 70% mancozeb 600 times spray, or 50% carbendazim suspension 50-80 ml, against water. 20 kg, evenly sprayed on the foliage in the sunny afternoon, sprayed once every 7-10 days, even sprayed 2-3 times.


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