How to deal with black spot disease in roses in July
This article introduces how to deal with black spot disease in roses in July, focusing on the explanation of green plants and flowers. Let's continue with the introduction by the editor.
How to deal with black spot disease in roses in July
Once July arrives, rose growers become nervous because this is the peak season for black spot and powdery mildew. If these black spots are not controlled in time, they will spread extensively, causing the leaves to fall off the entire plant and potentially infecting dozens of other plants at home, which may all die later.
So why do many rose growers find that their treatments for black spot and powdery mildew are ineffective? The main reasons are two.
1. Using the wrong medicine
If you are still using protective fungicides like carbendazim at this time, we need to use therapeutic fungicides once the disease is infected.
2. Long-term use of only one type of medicine
Long-term use of only one type of medicine can easily lead to resistance. For example, I usually use a benzoylpyrazole ester, which contains two ingredients: benzoyl methyl thiophanate and pyraclostrobin. These two drugs are less likely to cause resistance when used.
Moreover, they are specifically targeting black spot and powdery mildew, providing certain therapeutic effects. These drugs have strong penetration and systemic properties, effectively eliminating the pathogens within the plant.
The method of use is very simple: take a small capsule, dilute it in water 500 times, and spray the roses every 5-7 days. Remember, you need to spray 2-3 times consecutively to effectively eliminate the pathogens within the plant. Of course, you must clean the diseased leaves before spraying the medicine.
The above sharing of a comprehensive method for dealing with black spot disease in roses in July aims to provide a starting point to solve your green plant problems.