Potato late blight is a typical climatic disease, also known as potato mash. The mild climate of high temperature and high humidity is conducive to the rapid spread of disease. The disease mainly damages the leaves, stems and tubers of potatoes. If it is not timely and effective, it will be heavy. The field will cause a 50-80% reduction in production. According to the monitoring data of the potato late blight monitoring point (E:109.43, N:32.87) in the Yangshan Village of Jianyuan Town, the county agricultural technology center showed on May 25 that the disease has entered the second generation of infection in the local area. According to the surveyed personnel, Daejeon investigated the recent sporadic disease plants in the field, and the weather forecast has several consecutive rainy weather in recent days. The meteorological conditions are conducive to the further spread of the disease. It is recommended that the potato planting area in the middle of the mountain be timely carried out to prevent and control potato late blight.
Prevention and treatment recommendations:
1. Remove the diseased leaves. At present, the disease is in a stage of sporadic occurrence. It is necessary to strengthen the monitoring of field diseases. It is found that the diseased plants should be removed from the diseased leaves in time, and the field treatment should be taken out to control the spread of pathogens.
2. Ditching and draining. Strengthen the field management after the rainy weather, timely drain and drain the water, prevent water accumulation in the field, reduce the humidity in the field, and suppress the disease epidemic.
3. Chemical control. 1 Prevention and treatment time: For the current sporadic disease field, it is necessary to spray and prevent it in time, and prevent it once every 5-7 days, and continuously prevent and control 2-3 times; for the field that is currently not affected, it is necessary to strengthen disease monitoring, and at 6 Spray once a month before the first month. 2 Control agents: 50% mancozeb wettable powder or 58% metalaxyl manganese zinc or 50% manganese zinc. Fluoromorph 100g, or 70% propenium zinc 200g per acre, above control agent It is necessary to rotate and use to avoid the development of drug resistance and improve the control effect.
4. It is recommended that large potato planters and related technical personnel pay attention to the potato prevention and control Internet of Things WeChat public number: hsjdpotato, which can grasp the occurrence dynamics of potato late blight in our county in real time, and understand the latest potato pest control technology.
More pesticide knowledge, please pay attention to China Pesticide Network
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