Comprehensive Prevention and Control Measures for Potato Late Blight

Potato late blight is one of the diseases that have occurred in recent years, with rapid epidemics and heavy damage. It is necessary to take comprehensive measures for prevention and control.

1. The disease resistance of disease-resistant varieties and disease-free seed potato varieties has a great impact on the occurrence and epidemic of late blight disease. It is better to plant the virus-free potato varieties, and it is better to use the healthy seed potato planted in the year. Furthermore, it is necessary to establish a disease-free seed potato base and ensure that seed potatoes do not carry bacteria, and effectively reduce the source of infection by pathogens, which is the key to comprehensive prevention and control of late blight.

2. Rotation of severe disease fields and non-sweetse vegetables for more than 3 years of rotation. Potatoes and tomatoes should be planted 300-500 meters apart.

3. Improve cultivation techniques and strengthen field management. (1) Choose dry and sandy plots to grow potatoes and do well. In combination with cultivating soil, it prevents germs from invading tubers and reduces the incidence of tubers. (2) Expand the row spacing, narrow the plant spacing, or spray 90 ppm of paclobutrazol during the flower bud stage to control shoot growth and reduce field moisture. (3) Rationally apply nitrogen and phosphate fertilizers and increase potassium fertilizer to enhance plant disease resistance. (4) In the low-lying plots of land, we must pay attention to trench drainage, reduce the humidity in the field, and suppress the development of diseases. The prevention and treatment method is to spray 25% metalaxyl 500-800 times solution immediately after the emergence of the central disease strain, and it can also be used for irrigation. Heavy soil moisture or rainy days can also be applied to the roots with 1:4 metalaxyl and fine dry earth or coal ash. (5) Elimination of central diseased plants. Once central diseased plants are found, they must be promptly removed and burned in order to reduce the incidence.

4. Chemical control Potatoes enter the early flowering stage After the emergence of a central disease strain in field, 25% metalaxyl wettability is immediately used 500 times, or 80% Green Manson MnZn wettable powder, 75% chlorothalonil wettable powder 600 -800 times liquid, or 64% antiviral 500-750 times, or 70% thiophanate-methyl wettable powder, 70% Rhodoxenicus wettable powder, 50% antiseptic king WP 500 times spray. In the later period, it can also be used for 58% of Artemisia Mn-Zn 500-600 times 500-fold, or 70% of Alpha-Fe-Mn-Zn 300 times, or 72% of Green Hunter urea Mn-Zn wettable powder 600-800 times. Or 50% copper agent such as penthenyl morpholine or methosulfate spray. Spray once every 7-10 days, even spray 2-3 times, there is a good control effect.

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