The causes of the latest quality degradation of sweet potato and its preventive measures

Sweet potato is a familiar crop, and many farmers will plant it, but there will be hybrid degradation of popularized varieties in sweet potato production, which will seriously affect its quality and yield. So what are the reasons for the degradation of sweet potato quality? How to prevent it? Let's take a look.

I. causes of degradation of sweet potato varieties

1. Variation

Most of the popularized varieties of sweet potato belong to the first generation of hybrids of sexual hybridization among varieties, and their genetic heterozygosity is very strong, although their offspring are relatively stable after asexual reproduction. However, after repeated asexual reproduction, the frequency of bud transformation still exists, and with the increasing rate of variation types produced by bud variants, its production value is lower and lower year by year, resulting in variety degradation.

2. Virus disease

The incidence of virus disease is serious in some areas, and leaf mosaic virus disease is one of the common virus diseases that cause the degradation of sweet potato. After being infected with the virus disease, the yield is reduced by 15% and 30%.

3. Hybrid

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

II. Preventive measures

The main results are as follows: 1. First of all, attention should be paid to the selection and retention of the new varieties according to the characters and characteristics of the original varieties, while the varieties that have been degraded should be further strictly selected to avoid the increase of degradation types caused by man-made.

2. For the purification and rejuvenation of the popularized varieties, it should be established on the basis of vine seed selection, plant line identification and mixed line propagation, which has a very obvious effect on the improvement of species character. The individual plant with the characteristics of this variety was selected by inserting markers during planting, and after harvest, the remaining plants were numbered according to the productivity and the occurrence of diseases and insect pests, and the lines in the second year were identified, and the yield and quality were compared.

3. If you want customer service to degenerate varieties caused by mixing, it is necessary to prevent artificial mechanical mixing in the process of harvesting, transportation, storage, seedling raising, planting, and so on. If it is impossible to do so, one variety should be planted in a plot of land. When replenishing seedlings, seedlings should also be replenished separately according to different varieties.

4. For the variety degradation caused by virus disease, it is generally not suitable to popularize. If virus disease occurs in individual plants, the diseased plants can be pulled out in time, burned or buried deep in the field, so as not to harm other plants.

The above is the introduction of the causes of sweet potato variety degradation and preventive measures, hope to help you, want to know more related knowledge, please follow us.