Causes and Preventive measures of Sweet Potato quality degradation

Sweet potato is a familiar crop, many farmers will plant, but sweet potato production will appear to promote the hybrid degradation of varieties, will seriously affect its quality and yield. So what are the reasons for the degradation of sweet potato quality? How do we prevent that? Let's take a look.

1. Causes of sweet potato variety degradation

1. Variation

Most of the popularized varieties of sweet potato belong to the first generation hybrids of sexual hybridization between varieties, and the genetic heterozygosity is very strong. Although they are propagated asexually, their offspring are relatively stable. However, after repeated asexual propagation, the frequency of bud mutation still exists, and its production value decreases year by year with the increasing ratio of variant types produced by bud mutation, resulting in variety degeneration.

2. Virus disease

The virus disease is serious in some areas, and leaf shrinkage mosaic virus is one of the common virus diseases causing sweet potato degradation. After infection with virus disease, the yield decreases by 15%-30%.

3. Mixed

In the process of harvesting, transportation, storage, seedling raising and planting, many varieties are often mixed together and planted in the same plot at the same time because they do not pay attention to seed selection and retention. The characteristics of sweet potato varieties are different, and the requirements for external environment and cultivation conditions are also different, which ultimately affects the growth and yield of sweet potato.

II. Preventive measures

1. First of all, attention should be paid to the selection and retention of new varieties according to the characters and characteristics of the original varieties, and strict seed selection should be further carried out for the varieties that have been degraded to avoid artificially causing the increase of degradation types.

2. For the purification and rejuvenation of the popularized varieties, it should be established on the basis of selecting vines and keeping seeds, further selecting plants and keeping seeds, plant identification, and mixed line propagation of original seeds, which has a very obvious effect on improving seed characteristics. When planting, inserting marks to select individual plants with the characteristics of the variety; after harvesting, re-selecting according to productivity and disease and insect pest occurrence conditions; numbering the remaining plants; identifying the plant lines in the second year; and comparing yield and quality.

3, in order to customer service because of the variety degradation caused by mixing, from the prevention of harvest, transportation, storage, seedling, planting and other processes of artificial mechanical mixing, if it can not be done, take a block of land to concentrate on planting a variety, when the seedlings, should also be according to different varieties of seedlings.

4. For the variety degradation caused by virus disease, it is generally not suitable for promotion. If virus disease occurs in individual plants, the diseased plants can be removed in time and burned or buried deeply in order not to harm other plants.

The above is an introduction to the causes of sweet potato variety degradation and prevention measures. I hope it can help you. If you want to know more about it, please pay attention to us.