What medication should be used for black spot disease in roses?
The website introduces the medication for black spot disease in roses, and will share detailed information next.
This year has been really tough for rose enthusiasts, previously dealing with red spider mites repeatedly, and just when the rainy season arrived and the red spider mites were under control, black spot disease struck. With a gust of wind, the yellow leaves of the roses fall like autumn leaves, even in this hot weather, there's a sensation of leaves being swept away by the autumn wind.
What should we do when faced with the aggressive black spot disease?
I will tell you about two techniques for applying medication that can easily cure black spot disease in roses.
1. Choosing the right medication is important
If your roses are repeatedly affected by black spot disease and the medication doesn't seem to work, you should check if there's a problem with the medication you're using.
Many rose enthusiasts believe that carbendazim can treat any floral issues, such as powdery mildew, black spot disease, and even aphids and red spider mites. However, carbendazim is only a broad-spectrum fungicide, so it can only be used to kill fungi, not insects.
Although carbendazim can kill fungi, as an systemic fungicide, it is more focused on protective effects, so it is only suitable for prevention, and its therapeutic effects are poor. In the early stages of black spot infection in roses, you can directly remove the infected leaves and then apply carbendazim, but a stronger fungicide is needed when the black spot is severe.
To treat black spot disease, it is recommended to use tebuconazole, flusilazole, pyraoxystrobin, picoxystrobin, and myclobutanil, as these have better fungicidal effects and are more suitable for treatment.
For some rose varieties that are prone to black spot disease or in severe cases of black spot disease, it is recommended to use two fungicides together and to stick to regular applications for treatment.
What medication should be used for black spot disease in roses?
If you don't want to have many bottles and jars at home, the Green Plant Enthusiast website recommends using the tebuconazole·pyraoxystrobin in the rose care set. This medication contains both tebuconazole and pyraoxystrobin, which is equivalent to using two potent fungicides at the same time. When used with the thiamethoxam·chlorpyrifos in the set, it also solves the problem of green caterpillars in summer, making it very convenient and efficient.
2. The method of applying medication directly affects its efficacy
Some rose enthusiasts say, "I also used the medication you mentioned, but why do I still have black spot disease?" This has a lot to do with our method of applying medication.
First, the concentration of the medication should be diluted according to the instructions. Most pesticides on the market are calculated based on the acreage, which is not very friendly for rose enthusiasts because the water usage per acre is not fixed and can only be estimated. Some people calculate it based on 15 liters of water, some on 20 liters, and some rose enthusiasts just pour it randomly, so how can the effect be guaranteed?
The three types of medications in the rose care set are all diluted at a ratio of 1:1000, and a pipette is included, so the proportion is generally accurate, and the correct dilution ratio can lead to expected results.
In fact, the method of applying medication is also very important. Many rose enthusiasts don't know where to spray, and some even pour fungicides on the roots, which is incorrect. For pests and diseases that occur above the soil, we should solve them with medication above the soil, so don't easily pour pesticides on the roots.
When applying medication, the solution should be evenly sprayed on both the front and back of the rose leaves, as well as on the branches and soil surface. Comprehensive spraying can kill the fungi more thoroughly and reduce the probability of recurrence.
For roses with severe black spot disease, it is important to continue applying medication multiple times, applying once a week to consolidate the effect, to achieve complete cure. Then, regularly use carbendazim and zineb for prevention.
This article shares comprehensive knowledge about the medication for black spot disease in roses and hopes to help you.