When the radish roots reach the late stage of growth, due to the rapid expansion, some xylem parenchyma cells that are distant from the tissue will be in a state of “starvation†due to lack of nutrients. Cells begin to appear in the cells and produce cell gaps. . Not only the weight is reduced, but also the sugar content is reduced and the quality is poor, affecting the edible, processing, and storage properties. Therefore, prevention is the key. The prevention and control methods are as follows: 1. Select the varieties that are resistant to glutinous rice. Use varieties with tight meat quality and high dry matter content, such as Xinmimei and Qixianqing. 2. Take reasonable cultivation measures (1) Rational application of fertilizers Potassium and boron fertilizers are mainly applied to promote root development, strengthen the function of tissue transport, and prevent excessive nitrogen fertilizer, resulting in excessive leaf growth and affecting the input of assimilated substances into the fleshy roots. To ensure that the upper part of the ground and fleshy root growth balance, so that the fleshy roots are both fat and not worried. (2) Proper close planting, especially large-scale varieties, and appropriate increase in planting density can inhibit the growth of the shoots so that the roots have sufficient nutrients, thereby reducing the cruelty. Small species are sowed, the spacing is 5 to 10 centimeters; large varieties are generally spaced 50 to 60 centimeters, with plant spacings of 20 to 30 centimeters; medium type spacings are 40 to 50 centimeters, and plant spacing is 15 to 25 centimeters. (3) Reasonable water supply The soil water supply is uniform, and the soil moisture content is suitable for 70% to 80%. It is particularly necessary to prevent the soil moisture in the early stage and the soil drought in the later stage. (4) The selection of the plots and the appropriate sowing should be carried out by selecting the plot with good light and good drainage and irrigation. And select the appropriate sowing date, so that the root swelling period of fleshy roots is in the cold season with large temperature difference between day and night. 3. Medicament prevention carrot heart (1) Using naphthalene acetic acid to prevent radish growth in radish for 25 to 30 days and 35 to 40 days for each spray of naphthalene acetic acid at 100 mg/kg to prevent growth; and to spray 10 times before harvest to control storage. Pain early in the day. (2) The use of vitality against radish sprouts, the use of vitality 500 times vacuole seeds 3 to 5 hours after sowing, or in the radish 3 to 4 leaves with vitality factor 1000 times +0.1% to 0.2% of urea spray 2 ~ 3 times; root enlargement period with 500 ~ 600 times the activity of liquid spray 2 ~ 3 times, can make radish development sound, roots full. EV71 Nucleic Acid Test Kit EV71 Nucleic Acid Test Kit Guangdong Hecin Scientific, Inc. , https://www.hecinscientific.com