The sweet potato stem nematode disease, commonly known as cockroach disease, is a devastating disease caused by nematode infestation. It occurs in the sweet potato cultivation area in our country. The annual hazards will reduce the quality of the fries, and the yield will decline. Generally, the yield will be reduced by 20%-30%. The disease is fast-growing, low-temperature resistant, dry-tolerant, and widely spread. It must be comprehensively controlled.
1. Strengthen quarantine. We don't adjust seeding and buying seedlings from infected areas with stem nematode disease. Strictly quarantine the incoming and outgoing seedlings to prevent the disease from being introduced into the disease-free zone.
2. Cultivate disease-free strong seedlings. Choose land that has not been planted with sweet potatoes, sun dried potatoes, and no fertilizer for more than 3 years to be used as leave for farming. Leave the field to apply net fertilizer and pour water. When the potato seedlings are selected by water, they are soaked in hot water at 51°C-54°C for 10 minutes to kill the nematode on the surface of the potato shoots. And to do a seedling, spray a concentration of 0.5% phoxim liquid. Using high-cutting seedlings, cut the base of the seedlings 3-5 cm, remove the diseased parts of the base, and soak the seedlings (following leaves) with 150-200-fold 50% phoxim emulsion solution for 30 minutes.
3. Remove the diseased plant debris at any time. Seize the spring potato seedlings, summer potato transplants and other links, at any time to remove diseased plant debris, concentrated deep or incineration.
4. Implement rotation for change. The diseased land will be replanted with cotton, sorghum, corn, millet, sesame and other crops for more than three years. The disease prevention effect is very good. The author's investigations in many places have found that replanting of cotton, corn and other crops after 3-5 years of serious disease is no longer the incidence or incidence of sweet potatoes. However, crops such as onions, peanuts, and potatoes cannot be changed.
5. Use resistant varieties. The use of virus-free seedlings has a good disease prevention effect. Jishu 18, Lushu 3, Yushu 13 and other varieties with high disease resistance and high yield can be used.
6. Chemical control. When transplanting, use 50% phoxim 0.5-0.6 kg per acre, 2000 times water, 0.5 kg of liquid per hole, then close the hole by planting seedlings.
Household Cleaner,Grease Cleaner Kitchen,Household Carpet Cleaner,Cleaning Spray
Wuxi Keni Daily Cosmetics Co.,Ltd , https://www.kenidailycosmetics.com