What should I do if my Chinese roses are sick and the pesticides don't work?
A small tip for experience, introducing the content about what to do if your Chinese roses are sick and the pesticides don't work in the aspect of green plants and flowers. Next, the editor will introduce it.
Autumn is a period with a relatively high incidence of diseases and pests in Chinese roses. In recent days, many friends who helped fill out the questionnaire for the Chinese rose cultivation course survey also mentioned that they find it difficult to treat diseases and pests in Chinese roses.
I received a consultation from a friend yesterday, asking about the phenomenon shown in the photo below, where their Chinese roses had been sprayed with dimethoate but showed no improvement.
From the photo, it can be seen that this Chinese rose has powdery mildew. Regarding the symptoms of various diseases in Chinese roses, there is more detailed explanation in the Chinese rose cultivation series course. I won't elaborate on it today.
After identifying the disease and pest, the next step is to choose a treatment plan. Why doesn't the pesticide work after being sprayed by our friend?
First, let's understand the use of the pesticide "dimethoate." Dimethoate is an efficient broad-spectrum insecticide and acaricide with contact and systemic properties. Simply put, dimethoate is an insecticide. And the Chinese rose has powdery mildew.
Some friends may still not understand why powdery mildew cannot be treated with dimethoate. Here, I want to emphasize that it is important to distinguish between insect pests and diseases because the medications used for them are completely different. Insect pests, commonly known as worms, require insecticides, while the treatment of diseases requires fungicides.
What should I do if my Chinese roses are sick and the pesticides don't work?
Therefore, using dimethoate to treat powdery mildew is expected to be ineffective. To treat powdery mildew, you should first use fungicides, such as mancozeb, carbendazim, and polyoxysulfuron, to spray and treat.
I've also encountered friends asking why their Chinese roses still suffer from black spot disease after spraying with blue mancozeb.
Here, I need to explain the difference between preventive medication and therapeutic medication. Blue mancozeb is a commonly used drug for Chinese roses, mainly used for prevention before infection. On the other hand, myclobutanil and flusilazole are therapeutic fungicides. Therefore, one should make a distinction when using these medications.
It is recommended to use two fungicides together when treating Chinese rose diseases to enhance the fungicidal effect and speed up the healing process. In fact, the onset of diseases and pests in Chinese roses follows a certain pattern. The Green Plant Enthusiast Network will provide a comprehensive preventive treatment plan based on the pattern of disease and pest onset in the upcoming Chinese rose series course, eliminating Chinese rose diseases and pests at the source.
More practical experience and skills about Chinese rose cultivation can be found on the public account: Green Plant Enthusiast Garden (ilanyao).
The detailed explanation provided by the Green Plant Enthusiast Network on what to do if your Chinese roses are sick and the pesticides don't work is for reference and suggestion only!