Common Reasons and Treatment Methods for Yellow Leaves of Spring Chinese Roses
For netizens concerned, this article explains the common reasons and treatment methods for yellow leaves of spring Chinese roses in detail. The following is an introduction for you.
Recently, many gardening friends have asked: Why do Chinese roses have yellow leaves? What should I do if the flower buds droop? Today, I will answer these two questions for everyone, hoping to be helpful to you.
I. Common Reasons and Treatment Methods for Yellow Leaves of Spring Chinese Roses
Spring is supposed to be the time when Chinese roses grow rapidly, and the leaves should be lush and green. Why do they turn yellow? In fact, it's a normal phenomenon for Chinese roses to have yellow leaves in April. What we need to do is distinguish between natural yellowing and problematic yellowing.
1. Natural Metabolic Yellowing
In April, the branches of Chinese roses have already grown quite long and started to form buds. At this time, some yellow leaves will appear at the bottom of the Chinese rose or inside the vines. These yellow leaves are just discolored and easy to fall off, but there are no brown spots or pinhole-like spots on them, which means they are metabolic yellow leaves.
The leaves at the bottom and inside of the Chinese roses are shielded from light, and they are often the first to grow. By the end of March and April, they have completed their mission and will be metabolized. We just need to remove these yellow leaves; no other operation is needed.
2. Black Spot Disease Causing Yellow Leaves
Treatment of black spot disease is recommended with pyraclostrobin from the Chinese rose maintenance kit, a complex fungicide that works very well. It can also be treated with common fungicides like flusilazole and myclobutanil.
3. Red Spider Mite Causing Yellow Leaves
In southern regions, where temperatures are already relatively high, red spider mites have started. If you find that the leaves of Chinese roses show dense yellow spots with pinholes and turn yellow, you should check the back of the leaves. If there are many dirty dots on the back, it can be confirmed that they are infected with red spider mites and need to be treated with medication.
You can use damencosid, aikacarbazole, or the abamectin from the Chinese rose maintenance kit to control red spider mites. After spraying for 2 days, rinse the back of the leaves with water to wash away the red spider mites, then spray again to consolidate.
Common Reasons and Treatment Methods for Yellow Leaves of Spring Chinese Roses
4. Yellow Leaves Due to Lack of Fertilizer
If the root system of the Chinese rose is not good, it is also prone to iron deficiency yellowing in spring, which is manifested as light yellow new leaves. In this case, it is recommended to spray dilute growth fertilizer and multiple trace element fertilizers, or chelated iron on the leaves. When watering, you can add root-promoting powder.
II. What Causes the Drooping of Spring Chinese Rose Buds?
In April, Chinese roses often have the phenomenon of new branches drooping. When encountering drooping branches of Chinese roses, we should not panic first, but judge the cause of the drooping and then solve it accordingly. The common causes for the drooping of tender branches of Chinese roses are as follows.
1. Sudden Sunlight After Rainy Days
In March and April, there is a lot of rain. After consecutive rainy and cloudy days, when the weather clears up, Chinese roses tend to have drooping tender branches because they haven't adapted to the sudden change in sunlight.
In this case, we don't need to do anything. By the time the sun sets in the evening, the drooping branches will slowly recover and stand upright.
2. Soil Moisture Deficiency
In spring, Chinese roses have many branches and leaves, consume water quickly, and are prone to water deficiency. If there is not enough water in the soil, during the hot sun at noon, the tender branches of Chinese roses may easily droop. In this case, you can water the roots with some clean water, and usually, the drooping tender branches will quickly stand up after water supplementation.
When there is a lack of water, the tender branches usually droop slightly and will not droop too much unless it is very dry.
3.茎蜂 Damage
If our Chinese rose tender branches droop severely or slightly droop and cannot recover to stand upright at night, they are usually affected by茎蜂.
Stem sawflies specifically choose strong branches to lay eggs, and only one egg is laid per branch, so we often find that several tender branches on a Chinese rose droop at the same time, causing significant damage. There is no good way to save the branches affected by stem sawflies, and they generally need to be cut off.
However, some gardening friends have tried to扎 the larvae or eggs to death with a needle to save the branches, but it requires accurate targeting. Green Enthusiast Network has also tried this method, and it is quite difficult to扎 accurately. The branches saved with this method may also show poor growth. If your Chinese roses are also affected by stem sawflies, you might as well try it.
The above sharing about the common reasons and treatment methods for yellow leaves of spring Chinese roses and why the flower buds droop is the full content, hoping it can help you. At the same time, I hope everyone will visit the Green Enthusiast Network more often to see more green plant and flower experience and common sense!