Corn northern leaf blight dataset

Abstract

Maize leaf spot, also known as stripe spot, coal sheath, blight, leaf spot. The main symptoms of maize leaf blight are maize leaves. Water-stained grey-blue spots appeared on the lower leaves first, then spread along the veins to both ends. The lesions were long shuttle-shaped, light brown in the center and dark brown in the outer edge. When the wetness was high in the field, grey-black moulds appeared on the surface of the lesions. In severe cases, the lesions fuse, causing the whole leaf to die. [Control methods] Maize hybrids with resistance to both large and small spot diseases were selected as Jingzao 7 and Guidan 16. Implementing rotation cropping system to avoid continuous cropping of maize, deep ploughing of soil in autumn, deep burying of diseased stubble and eliminating bacterial sources; maize straw used as fuel is treated as early as possible after spring, and corn borer can be treated simultaneously; diseased stubble should be fully matured as compost, and straw fertilizer should not be applied in Maize fields. Improving cultivation techniques and enhancing disease resistance of summer maize early sowing can significantly reduce the incidence of disease. Appropriate application of phosphorus fertilizer, proper combination of nitrogen, phosphorus and potassium fertilizer, re-application of bell mouth fertilizer, implementation of maize-soybean intercropping, or intercropping with wheat, peanuts, sweet potatoes and other crops, wide and narrow row planting; rational irrigation, attention to field drainage in low-lying areas. Due to the limitation of objective conditions such as plant height and density, spraying control can focus on the high-yielding experimental fields such as seed production and intercropping fields. Generally, before and after maize bolting, when the disease rate in the field is over 70% and the disease leaf rate is about 20%, spraying begins. The effective insecticides are: 50% carbendazim wettable powder, 50% carbendazim wettable powder or 90% mancozeb, adding 500 times water, or 40% grams of aerosol powder 800 times the spray. Each mu of medicinal liquid 50-75 kg, spraying once every 7-10 days, a total of 2-3 times of prevention and control.