Why do the leaves of the rose fall off when touched and have many black spots?
If you want to know why the leaves of the rose fall off when touched and have many black spots, here is some content about green plants and flowers for you, introduced by our site's editor.
Recently, many friends have asked the question: why do the leaves of the rose fall off when touched after germination?
Have you encountered the same problem? Today, let's talk about why roses have this phenomenon.
Reasons for the leaves of the rose falling off when touched after germination
Normally, it is the germination period of roses now, and the leaves are newly grown and should not show yellowing or leaf drop. However, it should be noted that some leaves are not actually grown in the spring.
Especially last winter, the temperature was relatively warm, and many roses did not shed their leaves. Some may have shed their leaves but germinated early, and some varieties had already germinated in winter, growing a few leaves. Due to fluctuating temperatures, they grew slowly or stopped growing, and by spring, new leaves started to grow, making it seem like all the leaves were from new buds, but in fact, not all of them are new leaves.
Why do the leaves of the rose fall off when touched and have many black spots?
Those bottom leaves are actually grown in winter. After a winter of cold winds and frost, the vitality of these leaves has become very weak. When spring comes, new buds grow and consume a lot of nutrients. These bottom leaves, which grew out first, have reached the time for a glorious retirement, so they will fall off when touched gently.
Therefore, this is a normal metabolic phenomenon and not a disease or a problem with the growth of roses, so there is no need to be very worried.
Is the spot on the old leaves in early spring black spot disease?
In early spring, in addition to the old leaves shedding naturally, attentive plant lovers will also find that there are often obvious black or purplish-red spots on the old leaves. Are these spots black spot disease?
Generally speaking, diseases are less common in winter. Of course, if black spot disease was not treated in autumn, it may continue to appear in winter. But in most cases, the spots on the old leaves of roses in early spring are natural age spots.
This is because the leaves of roses have become weathered after frost and cold winds in winter, accelerating the aging process and causing age spots, which is also a normal metabolic process and not a pathological condition. These spots are also not contagious.
The above-sharing content about why the leaves of roses fall off when touched and have many black spots is for the reference of green plant enthusiasts, hoping to solve your problems in green plant and flower management.