Causes and treatments for yellowing leaves of rapeseed

1. Natural consumption

Reason: Rapeseed flowers will consume some of their stored nutrients during the winter, and then some of their leaves will turn yellow.

Measures: The yellowing of leaves caused by natural consumption usually does not cover a large area, so don’t worry, just continue with normal maintenance. If the yellowing area is relatively large, this reason can be ruled out and other factors can be considered.

2. Disease problems

Reason: Common diseases of rapeseed include downy mildew and white rust, which can easily cause large areas of leaves to turn yellow. Downy mildew can cause some polygonal yellow spots to appear on the leaves of rapeseed, and in severe cases, the entire leaf will turn yellow. White rust causes white raised spots on the underside of leaves and can also cause the leaves to turn yellow in severe cases.

Measures: In the early stage of the disease, you can use 600 times of 50% copper carbendazim wettable powder or 800 times of 58% mancozeb wettable powder to spray the whole plant for treatment once every seven to ten days. Spraying two or three times in a row will improve the condition.

3. Lack of phosphorus and potassium fertilizers

Reason: The appearance of large areas of yellow leaves on rapeseed flowers may be due to a lack of phosphorus and potassium fertilizers in the soil. This condition causes the edges of the leaves to appear burnt brown and then slowly turn yellow.

Measures: You can apply some phosphorus and potassium fertilizers in appropriate amounts to supplement nutrients in the soil. But if it is a potted rapeseed, you can pour some fermented rice water into it to alleviate the problem of yellow leaves.

4. Lack of trace elements

Cause: When large areas of yellow leaves appear, if the above reasons are excluded, it may be due to a lack of trace elements. The yellowing of old leaves at the bottom of the plant is generally due to a lack of magnesium, while the yellowing of new leaves may be due to a lack of multiple trace elements.

Measures: Apply some micro-root calcium + energy + impact magnesium at the bottom of the plant, and spray some micro-fruit power + green power on the leaves to supplement the calcium and phosphorus elements needed for plant growth and promote the recovery and growth of rapeseed flowers.