1. Enhance the quarantine measures for seed potatoes and potato seedlings. Strict quarantine protocols must be enforced to prevent the movement of infected seedlings into disease-free areas. Any imported seedlings suspected of carrying pathogens should be treated with appropriate chemical agents. Additionally, the transportation of sweet potatoes and dried potatoes should be closely monitored to ensure they do not contribute to the spread of pests or diseases.
2. Ensure complete disposal of infected plant material. The destructive stem nematode primarily spreads through infected potatoes, vines, and tubers. Among all parts of the diseased plant, the nematodes are most prevalent in the potato tubers, and after one winter and one spring, they can survive almost entirely. Therefore, it is essential to clean affected areas during the spring, nursery season, transplanting period, and late autumn harvest. All infected plant materials should be collected, dried, and burned thoroughly to prevent nematodes from re-entering the soil and causing further infestations.
3. Implement chemical control strategies. One effective method is to soak seedlings in a solution. You can use 50% phoxim emulsion or 40% methyl parathion emulsion diluted at a ratio of 100 to 150 times. Cut the base of the seedlings about 3 inches and immerse them in the solution for 10 minutes before planting. Another approach is toxic soil treatment: mix 1-2 kg of 5% stemline granules or 5% Shennongdan granules with 30 kg of fine dry soil. Apply 10 grams of this mixture per planting hole before watering, planting the seedlings, and covering the soil. Alternatively, you can use 3% Milur granules at a rate of 2 kg per acre, applying it 10 to 15 days before planting. This helps protect the crop without causing phytotoxicity when planting potatoes. For irrigation, mix 0.3 to 0.5 kg of 40% methyl parathion with 1500 kg of water. Apply 0.5 kg of the diluted solution per plant before planting, then cover the soil. In heavily infested fields, combining seedling soaking with liquid irrigation can significantly improve control effectiveness.
4. Adjust harvesting schedules. In areas with severe infestations, consider delaying the planting of spring potatoes until mid-May and harvesting earlier, ideally by late September or early October. This timing helps avoid the peak activity period of the destructive stem nematode. Timely harvesting ensures that the potatoes can be processed quickly for brewing or feeding purposes, reducing the risk of further infestation and economic loss.
Sporty Safety Shoes,Sporty Comfortable Safety Shoes,Slip Resistance Sporty Shoes,Red Safety Shoes
Brightway Shoes Co., Ltd. , https://www.brightwaysafety.com