Quality control of potato growing season

Strictly go to the bad

In the sapling stage, the first time, the mosaic, the inferior plant, and the weak plant were removed. In the first flowering stage, the second time, the first operation was repeated, and the leaf curl virus strain was mainly removed during this period.

2. Prevent the occurrence of mites

At the time of sowing, 15% iron-killing 15kg/hm2 was applied, and the insecticide was sprayed once every 7 days from the sapling stage until the plant completely died, preventing the occurrence of aphids and controlling the spread of the virus.

3. Field control of field storage diseases

Spraying at least 2 times of the systemic fungicide, Retoxin, in the growing season, the first time in the initial flowering stage, and the second time in the end of the flowering stage, not only can prevent late blight, but also improve the disease resistance of the tuber and reduce the storage disease. It is dry rot and soft rot.

4. Field testing

Original stock: in the greenhouse or net shed, 30-40 days after the end of the tissue culture seedlings, under the same production environment conditions, all the plants should be visually inspected once, and the non-normal plants or organ tissues that cannot be diagnosed by visual inspection should be collected immediately for laboratory. test.

Original species, first-class species and second-class species: using visual inspection, at least 5 to 10 points of each batch of seed potatoes, 100 strains per point, and non-normal plants or organ tissues that cannot be diagnosed by visual inspection should be collected immediately for laboratory. test.

The entire field inspection process is required to be completed within 40 days. The first inspection is from the bud to the full bloom. The second inspection was carried out about 30 days before the harvest. When any of the first inspection indicators exceeds 5 times the allowable rate, the inspection is stopped and the potato cannot be used as a seed potato. The first inspection of any indicator exceeds the allowable rate within 5 times, the ratio of the diseased plants and the mixed plants can be reduced by the grower, and the second inspection is the final field test result.

5. Killing

In the late growth stage and the end of the tuber expansion period, killing can cause the field pests and diseases to lose the host, the tuber is protected from pathogenic bacteria, reducing the amount of virus, and can also accelerate the plugging of the tuber epidermis, reduce the broken skin and improve the quality of the seed potato. The method of killing is to overwhelm the plant, seal the soil cracks, and then spray the desiccant without trace of 3000ml/hm2.

6. Harvest

Harvesting begins 15 days after the plant is completely dead, reducing the occurrence of peeling and rot. One is to harvest when the weather is fine and the soil is dry, to minimize the damage rate of the tubers. Second, the harvest should be thorough and clean, avoiding a large amount of potato chips left in the soil, and harvesting mechanical or animal power should be re-recovered to ensure that the harvest is clean and thorough. Third, after harvesting, the potato pieces are dried on the spot for 2-4 hours, and part of the water is distributed to make the potato skin dry, so as to reduce the incidence in storage. The fourth is to avoid rain during the harvesting, transportation and pre-storage process to prevent mildew. Fifth, the seed potatoes of different varieties and different grades should be harvested separately, and the single storage and single storage should be strictly prevented. Sixth, in the process of harvesting, transportation and storage of potato chips, it is necessary to minimize the number of transports and avoid mechanical damage to reduce tuber loss and pathogen infection.