Does summer rose need to be sprayed with fungicides every day?
An introduction to the topic of whether summer roses need to be sprayed with fungicides daily, let's understand it together next.
Does summer rose need to be sprayed with fungicides every day?
Roses are quite susceptible to rainy weather. Humidity and high temperatures can easily cause black spot disease, (T-J) disease, and other issues, leading to the rose losing all its leaves and becoming a bare stem.
Therefore, preventing various diseases and pests in roses is a priority, followed by treatment. Moreover, once roses are diseased, the drugs used for treatment are often expensive imported ones, and their effectiveness is not guaranteed, so prevention is the most important.
In Guangzhou, the first choice for roses should be heat-tolerant, frequent flowering, and disease-resistant varieties. As climbing roses often do not bloom or bloom poorly in Guangzhou, rose enthusiasts in Guangzhou should pay attention to the selection of rose varieties.
Disease resistance is a point that rose enthusiasts must consider, as roses are inherently prone to diseases. If you cultivate a disease-prone variety, it will be too troublesome.
Therefore, rose enthusiasts should not chase new varieties. Classic, disease-resistant, and beautifully flowering old varieties are the first choice.
For example, 'Juliet', 'Juice阳台', and 'True Zao' are quite good. Japanese roses, on the other hand, often have poor disease resistance and should be chosen with caution.
If spraying during rain, it is best to spray before the rain. If it rains too quickly and you don't have time, it's fine to spray promptly after the rain. Generally speaking, if it doesn't rain for 2 hours after spraying, there is no need for a re-spray.
In areas where it rains too frequently, having a rain shelter to avoid rain is best. For example, in the south, planting grapes often involves setting up small rain shelters, and cut roses are also produced in greenhouses.
The drugs used for spraying are quite simple. The most common ones like carbendazim, chlorothalonil, mancozeb, and thiophanate-methyl are all good and can be alternated.
Generally, spraying once every half a month can prevent effectively. Of course, in the rapid growth season of spring roses, when new leaves sprout too quickly, you can spray every 7-10 days.
If the rose plant develops a disease, such as signs of black spot, do not hesitate and spray the treatment immediately. Preventive agents are almost ineffective.
At this point, we can use 'Nadingwen' to treat black spot disease, spraying both sides of the leaves, which works quite well. For severe black spot, you can also remove the diseased leaves, spray the drug, and apply the drug to the roots.
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