The first drug is sprayed about a week or so before the potato doubling ridge is enclosed. If the late blight has not yet occurred at this time, use a protective agent. If the central disease strain has not been found within 7 to 10 days after the first application, Normal rainfall, the second time still apply protective agent. The second time the drug is applied for about 7 days, the central diseased plant will be found in the general year. At this time, the rainy season is coming. Therefore, the 3rd to 4th drug application of the systemic therapeutic agent, the 5th drug is used as the protective agent, and the 6th to 7th Use a systemic therapeutic agent.

If the humidity in the field is low and the varieties are resistant to disease, the application interval is 10 to 15 days and the number of application is 4 to 5 times. If the field humidity is high and the variety is susceptible, the application interval is 5 to 7 days. The number of times is 5-7 times. Rain spray within 8 hours should be sprayed in time. A variety of agents are used interchangeably.

The commonly used protective agent and its application amount per time is: 80% Dasheng-M45 150g per mu, 70% Anthai 150-200g per mu, 100g/l Kejia 50-60ml per mu, 25% Ruifan per Mu 40 ml and so on. Commonly used systemic therapeutic agents and their application doses are: 687.5 g/L Silver Pharisee 75 ml per mu, 52.5% fasting net 40 to 60 g/mu, 64% anti-drugs 80 to 100 g/mu, 72% Kelu Mu 80 ~ 100 grams, 50% Dimethomorphs 60 grams per mu and so on.

Pre-harvest control measures

1. Spray fungicide before killing.

In order to prevent the late blight from continuing to infect tubers, a 52.5% fast-acting water-dispersible granule 40-60 g/mu, 50% dimethomorph may be used as the systemic fungicide to prevent late blight before field killing. Powder 60g/mu or 64% anti-virus WP 80~100g/mu.

2. Kill in time.

For plants that have been affected but near-mature in the field of seed potato production, the plants on the ground should be immediately fleshed off and carried deep outside the field or burned.

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