What are the causes of the deformation of Chinese roses?
Today, the editor will introduce some small experiences in green plant maintenance regarding the causes of deformation in Chinese roses. Keep reading for more information!
What are the causes of the deformation of Chinese roses? These two causes are very common in spring!
Recently, there has been a lot of rain, and our Chinese roses need to be sprayed with pesticides frequently to prevent diseases and pests. However, some rose enthusiasts have found that the new leaves of their roses are curling and changing color. What is going on?
The reason for the curling and reddening of the new shoots of Chinese roses
In spring, it is a normal phenomenon for the new leaves of Chinese roses to turn red, especially for some strong new shoots, where both the branches and leaves are reddish and look very fresh. As long as the leaves are normally unfolded, without deformation or burnt edges, they are considered normal leaves. However, if the leaves show curling at the tips, or the color becomes darker and drier as in the above image, there is a problem. This phenomenon is usually caused by the following two reasons.
1. Pesticide burn
This spring, there has been a lot of rain, and the frequency of pesticide spraying has been relatively high. Moreover, we often mix multiple pesticides and spray them together. As a result, the leaves bear a lot, and these new leaves are very delicate. If the concentration is too high, it is easy to cause leaf burn.
There are two distinct symptoms of pesticide burn: one is that the new leaves are more severely affected, while the old leaves are less affected, or even show no symptoms. The second is that the leaf tips are prone to burn, or the leaves show spot-like discoloration, which is caused by the droplets of pesticide solution suspended on the leaf tips, resulting in burn, while the spray is more likely to cause spot-like burn.
So how can we avoid pesticide burn? Many rose enthusiasts are confused about the dilution concentration of pesticides. Since many pesticide instructions are based on the unit of mu (Chinese unit of area), it is difficult to figure out the exact amount. How should we calculate it?
Generally, for small packages of bagged pesticides, one bag is mixed with 15-18 liters of water. If it is a mixed pesticide, there will also be an amount per mu. Usually, the water volume per mu is 15-18 liters, but this concentration is for the amount used on crops. Compared to crops, our flowers are relatively delicate, so we can calculate based on 20 liters of water per mu.
For example, if 10 grams of pesticide is used per mu, then it is 10 grams of pesticide mixed with 20 liters of water, or 1 gram of pesticide mixed with 2 liters of water. By strictly following the dilution ratio, we can effectively avoid pesticide damage.
If multiple pesticides are used together, it is recommended not to exceed 4, as it is also easy to cause fertilizer damage. For specific drug combination methods, you can refer to the book "How to Grow Chinese Roses from Scratch" written by the editor.
2. Fertilizer damage
In addition to pesticide damage, fertilizer damage can also cause the curling of new leaves in Chinese roses and the local discoloration of leaves, or darkening of color. For example, the leaves of the Chinese rose in the above image look very large but are wrinkled, which is a typical case of fertilizer damage.
This type of fertilizer damage is most common during the vigorous growth period of Chinese roses. The concentration of fertilizer is not very high, just slightly beyond the tolerance range of the new shoots, causing indigestion. Usually, stopping the application of fertilizer will result in normal new leaves after a while.
If the concentration of the top-dressed fertilizer is too high, it can easily cause severe leaf burn and local necrosis and yellowing. If the damage is caused by root application, the leaves will start to turn yellow from the tips. If foliar application is used, there will usually be irregular spot-like burn, as the extent of burn mainly depends on the amount of fertilizer water that comes into contact.
Now, here is a small thinking question for you: What do you think is more likely to cause the fertilizer damage in the above image? Root application or foliar spray? Welcome to leave your comments.
The above is [] about the causes of deformation in Chinese roses. I hope this article can bring you some help!