Recently there has been a lot of rain, and our roses need to be medicated regularly to prevent pests and diseases, but some flower lovers have found that their roses’ new leaves are curled and discolored, what’s going on?
The reason why the new buds of roses are curling and turning red
In the spring, the reddish color of the newborn leaves of roses is a normal phenomenon, especially some strong new branches, branches and leaves are reddish and look very watery. As long as the leaves are normally spreading, no deformities, no scorched edges, they are normal leaves. However, if there is curling of the leaf tips as in the picture above, or even darkening and wilting of the color, then there is something wrong. This phenomenon pictured above is usually caused by the following two reasons.
Medication burns
This spring was very rainy, the frequency of medication is more frequent, and we often mix a variety of drugs and spray together. In this way, the pressure on the leaves will be higher, and these newborn leaves are very delicate, once the concentration of medicine is too high, it is easy to cause leaf burn.
There are two more distinctive features of drug burn:
- One is that the new leaves are more heavily affected and the old leaves are less so, and even the old leaves may have no symptoms at all.
- The second characteristic is that the tips of the leaves tend to scorch, or the leaves are spotty and discolored. This is because the droplets of the medicine hover over the leaf tips, causing scorching; and when spraying, the medicine is ejected, which tends to cause spot burns.
So what can be done to avoid medication burn? Many florists are confused about the dilution concentration of the liquid, because many pesticide instructions are “mu” as the unit of calculation, which makes it difficult to grasp. How to calculate?
Generally small bags of pesticides, a bag of 15-18L of water can be added. If it is assembled pesticides, will also be labeled mu dosage, generally an acre of water is 15-18L, but this concentration is for the amount of crops. Our flowers are more delicate compared to crops, so we can convert to 20L of water per mu.
If an acre of 10 grams of medicine, then it is 10 grams of medicine to 20L of water, 1 gram of medicine to 2L of water, strictly in accordance with the diluted ratio of ratios, you can effectively avoid drug damage.
If a variety of drugs are used together, it is recommended not to exceed 4 kinds, otherwise it is also easy to cause fertilizer damage. For the specific method of drug matching, you can refer to the introduction in the book “How to Raise Exploding Roses from Zero” written by Blue Demon.
Fertilization
In addition to drug damage, fertilizer damage can also cause the new leaves of roses to curl, and the leaves appear to be partially discolored or deepened in color. For example, the rose leaves pictured above, which look very fat but are wrinkled, are typical of fertilizer damage.
This type of fertilizer damage is most likely to occur when roses are at their peak of growth. Even if the concentration of the fertilizer is not very high, but just a little beyond the tolerance of the new rose buds, it can lead to “indigestion”. Usually, we just need to stop applying fertilizer, and the new leaves will grow back to normal after a period of time.
If the concentration of fertilizer we apply is too high, it will easily cause severe leaf burns, localized necrosis and yellowing of the leaves. If the root application of fertilizer caused by fertilizer damage, the leaves will start from the tip of the first yellow; while the foliar application, usually appear irregular spot burn, because the burn site mainly depends on the amount of fertilizer stained.
Thought-provoking question
How do you think the fertilizer damage pictured above is more likely to be caused? Was it caused by root fertilization or foliar spraying? Feel free to share your thoughts in the comments!