What Diseases Are Radishes Prone to in Autumn? A Detailed Guide to the Latest Control Methods
Radish is the most common vegetable in China. Whether on people's dining tables or fed to pigs as feed, it is very popular, and radishes are grown over a very wide range in China. But whether grown on a large scale or for a family's own self-sufficiency, some problems will be found. One of them is disease, and among diseases, those in autumn are the most serious. So what diseases are radishes prone to in autumn? How should they be controlled? Let's take a look below!
1. Downy mildew
Symptoms: Downy mildew mainly harms the leaves of radishes, and at the early stage of the disease it begins to invade from the outer leaves. Green to yellow spots gradually appear on the leaf surface, then gradually spread and expand and turn yellow-brown. The leaves are not damaged, and then along the leaf veins they become polygonal. When it is humid, white moldy substances appear on the leaf surface, and in severe cases it can directly lead to death. An average temperature of 16 degrees is when downy mildew is most likely to occur, and insufficient sunlight, continuous rainy weather, excessive permeability, and overly dense planting are all favorable conditions for the disease.
Control methods: When diseased plants with suspected symptoms are found, timely countermeasures should be taken and spraying should be carried out for control. If the weather is relatively dry after spraying, there is no need to spray again. If there is rainy and foggy weather, it should be sprayed once or twice more about a week later. An available agent is aluminum phosphoethyl wettable powder.
2. Soft rot
Soft rot mainly harms the roots, stems, and leaves of radishes. When the roots are infected, the disease generally starts at the root tip, and brown water-soaked soft rot patches appear at the early stage. It gradually spreads upward, and in the later stage the heart becomes soft and rotted into a mass, accompanied by a foul odor. When the stems and leaves are infected, water-soaked soft rot also begins to appear. After encountering drought, the spread stops, new leaves appear at the root head, and there is an obvious boundary between the diseased part and the normal part. Brown juice often seeps out, causing the whole radish to turn brown and soft-rot.
Control methods: When diseased plants are found, they should be dug out promptly, and then some lime should be scattered into the holes of the diseased plants for disinfection. At the early stage, some related agents such as kasugamycin can be sprayed for control. Spray about once a week, continuing for a week.
3. Black rot
Symptoms: Black rot mainly harms the roots and leaves of radishes. When the leaves are infected, a "v"-shaped diseased patch generally appears at the leaf edge, the leaf veins also gradually turn black, and the leaf edge begins to turn yellow, then gradually spreads to the entire leaf. When the roots are infected, it causes the vascular bundles to turn black, the internal tissues lack nutrients, and they slowly dry-rot, but the external symptoms are not very obvious. Poor drainage, rainy weather, inadequately decomposed farmyard manure, and continuous cropping can all lead to the occurrence of black rot.
Control methods: When diseased plants are found, they should be pulled out promptly and burned or deeply buried, away from the original site, to prevent infection, and then lime should be scattered into the holes of the diseased plants for disinfection. During field management of radishes, care should be taken to avoid injuring the radishes as much as possible and to reduce wounds on them. At the early stage of the disease, Haolike suspension concentrate can be sprayed for control.
The above are the diseases that radishes are relatively prone to in autumn. Everyone must pay special attention when managing radishes, to disinfecting the garden plot and handling diseased plants. Reduce sources of the disease and lower the incidence rate. If they are not handled in time, radishes cannot overwinter, and may not even last until early winter before dying in large areas. Therefore, I hope everyone can attach importance to the pests and diseases of radishes and improve their own economic benefits.