What are the common diseases of oilseed rape? Detailed explanation of control methods

Oilseed rape is a very important oil crop in China. Its flowers can be eaten, and the seeds can be pressed into oil after drying. It is a crop with very good planting prospects, and oilseed rape also has very high ornamental value, with very large planting areas at many tourist attractions. However, to successfully grow oilseed rape, diseases must be well controlled, otherwise the damage from disease is extremely serious. So what are the common diseases of oilseed rape? How should they be controlled? Let's take a look!

1. Brown spot disease

Disease characteristics: Brown spot disease mainly harms the leaves of oilseed rape. In the early stage after the leaves are infected, water-soaked irregular patches appear on the leaves, and as time goes on, the color of the patches gradually deepens. The size of the patches also expands, and in the end all the patches connect together to form a whole block, causing the leaves to fall off.

Control methods: Fertilization must ensure nutritional balance. Do not apply a single fertilizer, especially nitrogen fertilizer. According to the condition of the plants, appropriately spray some foliar fertilizer to promote plant growth and strengthen plant disease resistance. For affected plants, pesticides such as thiophanate-methyl wettable powder can be sprayed. Spray for a month and a half, and the interval should not exceed half a month at most.

2. Gray mold

Disease characteristics: Gray mold mainly harms the stems and leaves of the plant. At the seedling stage, the affected stems and leaves show water-soaked rot. After the plant matures, infection starts on the leaves closest to the ground, and the symptom is also the appearance of water-soaked patches, but they expand extremely quickly, causing the stems to rot completely and affecting growth. In addition, if the surrounding environment is relatively humid, colored mold spots will also appear on the patches.

Control methods: Keep the temperature and humidity of the vegetable garden constant to prevent excessive fluctuations. If a water film forms on the plants, it should be wiped off promptly, and the temperature difference between day and night should be well controlled. Before the disease occurs, pesticides such as chlorothalonil can be used for prevention. After the disease occurs, Wanmeiling can be used for control.

3. Downy mildew

Disease characteristics: Downy mildew occurs in both seedlings and mature plants, but the disease is more serious at the mature stage. When the disease occurs, it mainly starts from the lower leaves and then extends all the way upward. As with the previous two diseases, colored patches appear on the leaves, but they are pale yellow. If humidity is too high, mold spots will also appear on the spots. If not handled in time, the plants will die in the later stage.

Control methods: Before planting, control the planting density well to prevent overly dense planting, control the temperature in the vegetable garden well, and take timely corresponding measures in the face of various sudden weather conditions. After maturity, control the amount of watering and prohibit large-scale irrigation. After the disease occurs, use Previcur liquid for spraying control, once a week for one month.

The above are the common diseases and control methods when growing oilseed rape. If you want to make money by growing oilseed rape, the planting area must be very large. Therefore, management is also relatively troublesome, and it is impossible to observe the growth of all oilseed rape in time, so we must do a good job of prevention to prevent large-scale disease outbreaks and reduce our planting profits. This article is for reference only, and I hope it can be helpful to everyone.