Common Reasons and Solutions for Yellow Leaves in Autumn Roses
Today's tip for daily life: common reasons and solutions for yellow leaves in autumn roses, knowledge about flowers. Keep reading!
As autumn arrives, roses start entering a new growth phase, and everyone is looking forward to the autumn flowers of roses. However, some rose lovers have found that their roses have many yellow leaves. What's going on? Let's briefly summarize the common reasons for yellow leaves in roses in autumn.
Common Reasons and Solutions for Yellow Leaves in Autumn Roses
After entering autumn, roses enter a new period of rapid growth. At this time, the new buds of roses sprout quickly, while some old leaves, after being exposed to the summer sun, have completed their mission and start to turn yellow and fall off, which is a normal phenomenon of natural metabolism. Metabolic yellow leaves are mainly old leaves, which show overall yellowing of the leaves and are easy to fall off. Such yellow leaves can be removed.
Besides yellow leaves caused by natural metabolism, there are also some yellow leaf phenomena caused by diseases or improper management. The common ones are as follows.
1. -- Black Spot Disease --
Black spot disease is the number one disease that endangers the health of roses, and it is very common. From April in spring to late autumn, this period is a high-incidence period for black spot disease. With more rainfall in autumn, black spot disease is more likely to occur. If preventive measures are not taken, black spot disease can be quite severe in autumn, resulting in large yellow leaves and leaf fall.
The characteristic manifestation of black spot disease is that there will be obvious black spots on the leaves of roses, which will gradually spread, causing the entire rose leaf to turn yellow and fall off. In severe cases, it will make the rose into a bare stem.
In the face of black spot disease, prevention should be the main approach. Regularly spray fungicides for prevention, or sprinkle long-acting fungicide granules on the soil surface, which can greatly reduce the probability of infection. When black spot disease is found, remove the diseased leaves in time and spray fungicides for control.
2. -- Red Spider --
In addition to black spot disease, red spiders can also cause yellowing of rose leaves. When roses show dense yellow spots like pinholes, it is mostly caused by red spider infestation. Red spiders prefer dry and stuffy environments and are prone to occur in summer and autumn. Preventive measures should be taken to keep the environment well-ventilated and increase humidity by sprinkling water on the leaves of roses in dry autumn.
If roses are infected with red spiders, spray miticides in time for treatment. Special miticides, such as Acarbose or Abamectin, must be used. Regular insecticides are not effective.
Common Reasons and Solutions for Yellow Leaves in Autumn Roses
3. -- Drought --
After entering autumn, the sun is not as hot and it often rains, so the soil in pots dries up more slowly. Many rose lovers start to ignore watering, which can easily lead to yellow leaves in potted roses due to excessive drought.
Although we water the roses when we find the potting soil dry, many yellow leaves often appear in roses 2-3 days after watering, which is actually a后遗症 caused by excessive drought.
Yellow leaves caused by drought should be cleaned up in time, and then pay attention to keeping the potting soil moist and avoid drought. If there is root powder, it can be added to the water to promote the growth of new roots in roses.
4. -- Fertilizer Burn --
After entering autumn, the temperature drops, and water-soluble fertilizers start to be used again. However, due to the different conditions and fertilizer tolerance of rose seedlings, if the concentration of water-soluble fertilizers is not properly controlled, it can easily cause fertilizer burn, which is manifested by the yellowing of the tips and edges of rose leaves.
When applying water-soluble fertilizers to roses at the beginning of autumn, adjustments should be made according to the condition of the seedlings. If the seedlings are weak or even bare, water-soluble fertilizers can be omitted or diluted to more than 1500 times before use. If the seedlings are strong and have good fertilizer tolerance, it can be diluted to 1000-1200 times. As the rose seedlings grow, the concentration of the fertilizer can be gradually adjusted to 800-1000 times.
If yellowing of the leaf tips or edges of roses appears after fertilization, it is necessary to water the roots with a large amount of water to dilute the concentration of fertilizer in the soil and alleviate the fertilizer burn.
5. -- Deficiency of Elements --
In autumn, there are also many cases of yellow leaves in roses due to element deficiency, especially in roses that have not been well managed in summer, with more root damage. After sprouting in autumn, they often have poor absorption and show signs of element deficiency.
Roses are more prone to iron deficiency yellowing. Iron fertilizers can be supplemented separately, using chelated iron to spray on the leaves, or multiple trace element fertilizers can be used for supplementation.
The above are the common reasons and solutions for yellow leaves in autumn roses and the five major reasons why roses always have yellow leaves in autumn, which every rose grower must understand, for everyone's reference and operation.