Latest Summary of Common Peony Diseases and Treatment Methods
Peony is a sun-loving, drought-tolerant plant. Its colorful blooms always give people a different visual impact, yet even the most beautiful and delicate flowers cannot escape the invasion of diseases. When various diseases occur, what should we do to solve these problems? Below, the editor lists several common diseases and gives solutions. If you encounter the following difficulties, you don't need to worry that you can't solve them.
1. Black spot
Black spot is one of the more common diseases of peony. The main affected part is the leaves. In the early stage, certain spots form on the leaves, then begin to spread, and finally cause the leaf surface to fall off and die. The onset time is mostly around July-September. After autumn, pay attention to clearing away dry and withered branches and leaves to avoid infection by pathogens. After infection, first remove the infected parts, then spray with 40% Folpet wettable powder at 500 times dilution or 58% metalaxyl-mancozeb wettable powder at 500-800 times dilution for treatment.
2. Powdery mildew
Powdery mildew is a disease of peony that is relatively difficult to detect in the early stage. It generally appears in relatively hidden branches and leaves. By the time it can be easily found, it is usually already quite serious. The symptoms are that the leaf surface is covered with white filamentous material, and white moldy patches are present on the rhizomes and leaf stalks. So how do you prevent it? In the early stage, carefully observe parts that are usually hard to observe. Second, after discovery, promptly deal with the affected locations. After treatment, spray the wounds with 70% thiophanate-methyl wettable powder at 800-1000 times dilution or 40% Fuxing emulsifiable concentrate at 8000-9000 times dilution. Also ensure good ventilation treatment to prevent secondary infection.
3. Rust
Rust is one of the diseases commonly encountered by peony and easy to detect. This disease places relatively more emphasis on prevention. When it occurs, it generally first appears on the leaves, producing yellow spots, then similar things gradually appear on the underside as well, and finally cause the leaves to wither and die in large numbers. Diseased plants must be kept away from disease-free plants. The onset time is concentrated around May. After onset, 97% sodium dichlone at 400 times dilution or 62.25% Xiansheng at 600-800 times dilution can be used for treatment.
4. Leaf mold
Leaf mold can be considered one of the more serious peony diseases, and it can easily cause the entire plant to wither. In the early stage of onset, purple-brown spots appear on the leaves, then slowly turn into dark green moldy matter, and may even spread across the entire plant. The onset time is mostly concentrated in July-August on days with higher humidity, so planting density must be high, and good ventilation must be maintained. After onset, generally spray 40% carbendazim suspension concentrate at 600 times dilution or 50% thiophanate-methyl at 800 times dilution to solve it
The above are some commonly encountered peony diseases and their treatment methods. In fact, after reading this, we will find that peony has relatively strict requirements for planting density and ventilation. Second is the treatment of pathogens after onset; the pathogen-affected parts must never be allowed to come into contact with the plants again. I hope these methods can provide everyone with useful information. Dear friends, keep following Qinong Web!