Causes and control methods of black heart of radish

Radish is a kind of good we often eat, which is rich in vitamins and a variety of trace elements needed by the human body, and has an excellent effect on health preservation and health care, but some farmers find that their radish has black heart symptoms, and the radish has completely lost its commodity value. causing huge losses. So what is the cause of radish black heart? How to prevent and cure it? Let's get to know it.

1. Anoxic black heart

Root hypoxia caused by the black heart, the root will be cut open will find that the fleshy root xylem blackened, there are a lot of black dots, can not be eaten. At this time, radish in the field caused by the application of a large number of unmature or bad organic fertilizer, especially manure, will lead to strong microbial activity in the soil, excessive oxygen consumption, causing root asphyxiation, and some tissues cause black heart or black skin phenomenon due to lack of oxygen.

Prevention and control methods: the land planted with radish should be deeply turned and leveled, keep the soil loose and increase permeability. When applying organic fertilizer or farm manure, you must go through full maturity, reasonable irrigation, strengthen mid-ploughing, supply sufficient oxygen to the roots, and promote its healthy growth. Timely drainage after rain, so as not to cause black heart or skin caused by stagnant water. Radish should be stored in an appropriate amount, not more than half of the cellar capacity, strengthen ventilation and control the lower temperature and humidity in the cellar.

2. Boron deficiency black heart

Boron is one of the indispensable elements in the growth of radish, and boron deficiency is easy to appear black, hollow and rotten heart phenomenon. the reason for boron deficiency is the lack of boron in soil, and the partial application of certain elements inhibits the absorption of boron by roots. third, in the high temperature and drought environment, it will also affect the absorption of boron by roots, resulting in boron deficiency.

Prevention and control method: adding 300-400 grams of borax into the base fertilizer, fully mixing it with other fertilizer grains, or taking the measure of spraying boron with foliar fertilizer during the growing period, generally from the emergence of 2-3 true leaves of radish to before harvest, 0.2% boric acid or 0.3% borax aqueous solution can be sprayed every 10 days for a total of three times. In addition, it is necessary to keep the field moist, promote the absorption of boron by roots, prevent drought and irrigate in time during the growing period.

3. Black rot black heart

Black rot is a disease caused by bacteria, which mainly harms the roots and leaves. The disease at the seedling stage is that the cotyledons are flooded, and the root pulp turns black and rotten. When the leaves are sick, the whole leaves will gradually turn yellow and dry, and the pathogen will also want to prevent the stems and roots along the veins of the leaves, causing the leaves of the whole plant to turn yellow and die. After the fleshy root was infected, the vascular bundles could be seen in the shape of radiation, dark brown, dry shrinkage cavity in severe cases, and the vascular bundles overflowed bacterial pus.

Control methods: avoid continuous cropping with cruciferous vegetables, select varieties with strong disease resistance when planting, and use 50% Fumishuang wettable powder (0.4% seed weight) before sowing. In order to control pests such as yellow striped beetle and aphids as soon as possible, it can be propagated by spraying Garinon, ammonia copper water agent and agricultural streptomycin sulfate at the initial stage of the disease, once every 7-10 days, 2-3 times in a row.

The above is the introduction of radish black heart causes and prevention methods, hope to help you, want to know more related knowledge, please pay attention to us.