Are red rape leaves diseased? How to prevent and treat red rape leaves?

Rapeseed is a common vegetable in life. It is deeply loved by people because of its rich nutrition and its effects of widening the intestines, promoting bowel movements, detoxifying and reducing swelling. However, many people have found the phenomenon of red leaves when growing rapeseed. So is the red leaves of rapeseed a disease? How to prevent and treat the red leaves of rapeseed? The following editor will explain them one by one, hoping to help everyone.

Is the red leaf of rapeseed disease

1. Too dense planting

The seeds are mostly sown manually, and the density is difficult to control. Some seedlings are too dense and close together, causing the leaves to turn red. Excess seedlings should be pulled out in time, and appropriate amount of topdressing should be applied.

2. Drought

In the early stage of rapeseed planting, if there is no rain for a long time, the soil will be insufficiently hydrated, the seedlings will have difficulty absorbing fertilizers due to underdeveloped root systems, the seedlings will grow slowly, and the leaves will turn red. The remedy is to water in time, but not to irrigate on a large scale.

3. Frost damage to red leaves

Although rapeseed is a winter crop, when the temperature drops suddenly below 0°, rapeseed cannot adapt due to the slow cooling process, resulting in red leaves.

4. Aphid disease

The most common disease in the growth process of rapeseed is aphids, which directly cause the leaves to turn red and shrink. The main method of preventing and controlling aphids is pesticides. If the area where aphids occur is large, pesticides should be sprayed immediately.

How to prevent and control red leaves of rapeseed

1. Drought during the seedling stage causes the plants to be short and the leaves to be light yellow-red. If this symptom occurs, water should be applied in time.

2. When there is too much rain during the seedling stage, the accumulated water will damage the roots, causing the seedlings to become stunted and the leaves to turn dark red. Ditch clearing and drainage work should be done in time.

3. If the amount of seeds sown in the direct-seeded vegetable field is too large, the seedlings will be crowded, which will affect the seedlings' absorption of nutrients and cause the leaves to turn yellow and red. At this time, the seedlings should be thinned out in time and quick-acting nitrogen fertilizer should be applied once.

What are the effects of high temperature on rapeseed production?

The 25 to 45 days after rapeseed blooms is the period when rapeseed grains gain the most weight and oil content. 70% of the nutrients in the seeds and 90% of the oil content are formed within these 20 days. Therefore, if high temperatures occur during this period, the nutrient transport from the rapeseed plant to the grains will be hindered, the grains will not be filled enough, the thousand-grain weight will decrease, and the oil content of the rapeseed grains will decrease accordingly.