Comprehensive Prevention and Control Techniques of Sweet Potato Stem Nematodiasis
Sweet Potato stem nematode disease is a devastating disease in the production of sweet potatoes. It is highly hazardous and spreads fast. It can infect the hazards at the seedbed stage, field stage and storage period, but it mainly invades the tubers. The damaged sweet potato skin is brown, green, cracked, and light. Some potato chips look no different, but it is just internal. The disease not only affects the quality of sweet potatoes, but also seriously affects the yield of sweet potatoes.
Sweet potato stem nematode disease is caused by a parasitic stem nematode infestation. The pathogenic nematode is a slender, worm-shaped, slightly pointed tip of the worm body, 0.9-1.45 mm in length, capable of wintering as adults, larvae, eggs in tubers, and wintering of adults and larvae in soil and manure. Not resistant to high temperatures, immersed in warm water at 50°C for 10 minutes can kill 98%. The insect is hi damp, resistant to low temperatures, and stops at -15°C, but does not die; the insect is resistant to dryness and can live for a year under extremely dry conditions. Therefore, it is more difficult to eradicate the worm.
To control sweet potato stem nematode disease, the following comprehensive measures can be taken:
1. Selection of disease-resistant varieties: that is, when introducing seeds, they should be selected for local disease resistance and detoxification. For example, Jinshu No. 10, Yushu No. 13, Sushu No. 8 and Beijing 553 are suitable for planting and resistance to stem nematode disease in the Central Plains.
2. Cultivate disease-free strong seedlings: Apply 3% carbofuran microgranules per square meter of seedbed to 60 g, and then cover the soil; soak the seeds in warm water of 52-53°C for 10 minutes before seeding the seed potatoes to kill the seedlings. Nematodes at a depth of 7 mm; when the second seedlings were cut, they were sprinkled with aldicarb (watered after application) or poured with methyl isotrixone solution. Due to the high number of stem nematodes in the base of the seedlings, high-cutting seedlings can be used, ie after harvesting, the roots of the seedlings should be cut 3-5 cm and then soaked with 50% phoxim or 50% methylisothione 150-200 times. 30 minutes.
3, the establishment of disease-free fields: the use of disease-free plots as a retained field, and strict selection of seed potatoes, seedlings. The summer potato should be planted from the nursery or cut from the spring potato and planted in a disease-free place for the following year.
4. Chemical control: In the severe ward area, methyl isofluosal or phoxim is 2000-2500 times. When planting seedlings, 0.50 kilograms per hole is poured. Olivine Granules or stemline granules can also be used. 1-1.50 kg, acupuncture at the time of planting, and then watering. Mild wards were treated with methyl isophosphorus or phoxim 150-200 times. Before planting, the base of the seedlings was soaked for 30 minutes. The control effect was very good.
5. Elimination of Insect Sources: When planting, harvesting and harvesting each year, the diseased potato, diseased and diseased plant residues should be removed, and then dried and burned or boiled for feed. Diseased potato peel, potato washing water, feed residue, diseased soil, diseased nursery soil should not be used as fertilizer raw materials. Fertilizer should be fermented by high temperature above 50°C.
6. Crop rotation: The severe disease plots should be rotated. Sweet potato and wheat, corn, millet, cotton, and tobacco rotate in each other, and no sweet potato is grown for more than 3 years. It can basically control the occurrence of stem nematode disease.
7. Adjust the time for harvesting and harvesting: In severe cases, change the early planting of the spring potato to postpone planting until mid-May, and harvest it in advance to the end of September or early October to avoid the nematode’s endangering period, and slice and dry it in time for brewing raw materials or cooking. After cooked as feed.
8, strengthen quarantine: that is, strict quarantine system. It is forbidden to transport diseased potato and diseased seedlings across the area to prevent the expansion of the affected area.
Fresh Chestnut origin place is Dandong city,Liaoning Province &Taian city,Shandong province.We main produce Liaoning Chestnuts, Because customers like bigger size,Taian chestnut can`t did it. It`s harvested in September every year,export time from September to December. Fresh Chestnut 30-40pcs packed in 5kg/jute bag,10kg/jute bag,rarely use cartons packaging. Some customers need pallets and fumigate,some customers don`t need,it`s depending on the import country.We can supply 800tons/month. If you have any needs,please let me know,i will make you satisfy with our best quality,my rich experience and best service.if you are the first time import.i will give you suitable suggest.We also supplied Fresh Ginger ,Air Dried Ginger , Fresh Garlic , White Garlic ,red garlic. Sweet Corn , Fresh Taro , Fresh Potato , Holland Potato . Fresh Baby Mandarin, Fresh Red Grape , Fresh Pomelo , Fresh Ya Pear Chaotian Chili , Paprika Powder , Fresh Apple and so on.
Fresh Chestnut 30-40Pcs,Raw Chestnuts,Fresh Sweet Chestnuts,Natural Chestnut
Jining Fuyuan Fruits And Vegetables Co., Ltd. , http://www.fuyuanfv.com