Are the many brown spots on the back of the Canary Rose leaves a disease or pest?
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After experiencing the severe heat of a summer, it is often found that the leaves of the rose are prone to general scars, such as the ones below.
So what exactly is the problem? Is it a disease or pest damage? Many friends can't tell, but actually, this is a manifestation of pest damage.
Every time a friend asks about this situation and is told it's pest damage, they often say in confusion: I looked, but I didn't find any pests?
In fact, this pest is not mysterious at all. It's just that when we can see the pest, we often can't see its harm. On the contrary, when we can't see the pest, the harm is more serious. This pest is called thrips.
In spring, thrips can often be seen in the light-colored rose flowers and are a very small pest, even smaller than ants. Generally, after the roses bloom in spring, thrips will begin to reproduce in large numbers.
Are the many brown spots on the back of the Canary Rose leaves caused by disease or pest?
In May and June, thrips lay eggs on the back of the rose leaves. At this time, it is often found that the leaves of the rose have curled up and have rice-like larvae on the back, which is the best time to kill thrips.
If no preventive measures are taken during the larval stage, then in summer, thrips will be more rampant. Not only will they cause scars on the rose leaves, but they can also cause the new buds to wither, deform, and the leaves to become deformed, severely affecting the normal growth of the rose.
For the rose thrips pest, the focus is on prevention. It is necessary to spray pesticides regularly. You can use insecticides while spraying fungicides to achieve a good preventive effect.