The Control Techniques of Sweet Potato Stem Nematode Disease
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.
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