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Detailed Explanation of Main Soybean Disease Control Measures

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Soybean mosaic virus disease The pathogen of soybean mosaic virus disease is a virus, and there is currently no specific chemical agent. The key to controlling this disease is to control the occurrence, spread and damage of aphids, so as to "cut off the source of the virus and control the disease by controlling the insect." Apply pesticides in a timely manner in the early stage of aphid occurrence and keep them under control at the beginning of the peak period. 1. Agricultural control: ① Promote disease-resistant (tolerant) varieties; ② Strictly select seeds before sowing and remove brown spot seeds; ③ Establish a virus-free (low-virus) seed propagation system and healthy seed fields. Healthy seeds should be selected for seed fields, and diseased seedlings should be removed in combination with hoeing before aphids occur. Seed fields should be isolated from virus sources by more than 100 m to prevent the spread of the pathogen; ④ Avoid late sowing so that the susceptible period avoids the aphid peak; ⑤ When aphids appear in soybean fields, control them in a timely manner. 50% pirimicarb wettable powder and 5% fenvalerate emulsifiable concentrate may be used; ⑥ Clear weeds around the farmland. 2. Physical or biological control: Silver-gray plastic film may be placed in the field to repel aphids. The amount and frequency of chemical pesticide application should be minimized in the field to protect natural enemies of aphids such as green lacewings, ladybugs and hoverflies. 3. Chemical control: Start spraying for control before the onset of viral disease or in the early stage of the disease. In July to August, agents for controlling viral diseases may also be sprayed in combination with aphid control. 4. Commonly used agents: 2% Jun Ke Du Ke aqueous solution, 20% Virus A wettable powder, etc. 5. Scope of application: All soybean production areas. 6. Precautions: Spraying should be uniform with no missed areas, and application should be continuous 2 times with an interval of 7 days to 10 days each time; actions should be unified and control should be concentrated and contiguous. Agents should be used alternately to prevent the development of aphid resistance.

Soybean mosaic virus disease The pathogen of soybean mosaic virus disease is a virus, and there is currently no specific chemical agent. The key to controlling this disease is to control the occurrence, spread and damage of aphids, so as to "cut off the source of the virus and control the disease by controlling the insect." Apply pesticides in a timely manner in the early stage of aphid occurrence and keep them under control at the beginning of the peak period.

1. Agricultural control: ① Promote disease-resistant (tolerant) varieties; ② Strictly select seeds before sowing and remove brown spot seeds; ③ Establish a virus-free (low-virus) seed propagation system and healthy seed fields. Healthy seeds should be selected for seed fields, and diseased seedlings should be removed in combination with hoeing before aphids occur. Seed fields should be isolated from virus sources by more than 100 m to prevent the spread of the pathogen; ④ Avoid late sowing so that the susceptible period avoids the aphid peak; ⑤ When aphids appear in soybean fields, control them in a timely manner. 50% pirimicarb wettable powder and 5% fenvalerate emulsifiable concentrate may be used; ⑥ Clear weeds around the farmland. 2. Physical or biological control: Silver-gray plastic film may be placed in the field to repel aphids. The amount and frequency of chemical pesticide application should be minimized in the field to protect natural enemies of aphids such as green lacewings, ladybugs and hoverflies. 3. Chemical control: Start spraying for control before the onset of viral disease or in the early stage of the disease. In July to August, agents for controlling viral diseases may also be sprayed in combination with aphid control. 4. Commonly used agents: 2% Jun Ke Du Ke aqueous solution, 20% Virus A wettable powder, etc. 5. Scope of application: All soybean production areas. 6. Precautions: Spraying should be uniform with no missed areas, and application should be continuous 2 times with an interval of 7 days to 10 days each time; actions should be unified and control should be concentrated and contiguous. Agents should be used alternately to prevent the development of aphid resistance.

For soybean rust, the main approach is to use resistant (tolerant) varieties, with chemical control as a supplement, combined with agricultural measures, and integrated control should be implemented.

1. Agricultural control: ① Select resistant (tolerant) varieties; ② In severely affected areas, autumn-sown soybean may be changed to spring sowing to avoid climatic conditions suitable for disease development; ③ Rational crop rotation and intercropping, clear ditches and drain waterlogging to reduce field humidity; ④ Cultivate and weed to change the field microclimate; ⑤ Increase the application of phosphorus and potassium fertilizers to improve plant disease resistance; ⑥ In autumn soybean areas, do not plant field-edge beans, which can reduce the number of pathogens. 2. Chemical control: Do a good job in forecasting and forecast, and spray pesticides at the appropriate time in severe disease years. 3. Commonly used agents: triadimefon, chlorothalonil, salicylanilide, benomyl, tridemorph, mancozeb, etc. 4. Scope of application: Areas where soybean rust occurs. 5. Precautions: When applying, dilute with water as required and spray evenly on the leaves. Control should be timely, especially when there are many rainy days and high field humidity, the disease development should be controlled promptly.

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