Detailed Explanation of Common Peony Diseases and Treatment Methods
Peony is a sun-loving, drought-tolerant plant, and its colorful blooms always give everyone a different visual impact. However, 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 are a friend who has encountered the following difficulties, you don't need to worry about not being able to 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 will 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 to September. After autumn, pay attention to cleaning up dry branches and leaves to avoid infection by pathogens. After infection, first remove the infected parts, then spray for treatment with 40% Folpet wettable powder 500 times solution or 58% metalaxyl-mancozeb wettable powder 500-800 times solution.
2. Powdery mildew
Powdery mildew is a disease of peony that is relatively difficult to find in the early stage of onset. 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 will be covered with white filamentous material, and white mildew-like substances will exist on the rhizomes and petioles. So how to prevent it? In the early stage, carefully observe the parts that are usually difficult to observe. Second, after discovery, promptly handle the affected location. After handling, spray the wound with 70% thiophanate-methyl wettable powder 800-1000 times solution or 40% Fuxing emulsifiable concentrate 8000-9000 times solution. Also do a good job of ventilation treatment to prevent secondary infection.
3. Rust
Rust is one of the diseases commonly encountered by peony and easy to find. This disease places more emphasis on protection. When it occurs, it generally first appears on the leaves, producing yellow spots, and then similar things will gradually appear on the back side, finally causing the leaves to wither and die in large numbers. Affected plants must be kept away from disease-free plants. The onset time is concentrated around May. After onset, 97% sodium diethyldithiocarbamate 400 times solution or 62.25% Xiansheng 600-800 times solution can be used for treatment.
4. Leaf mold
Leaf mold can be considered one of the more serious peony diseases, and it very easily causes the entire plant to wither. In the early stage of onset, purple-brown spots appear on the leaves, then slowly turn into dark green mold-like material, and may even spread across the entire plant. The onset time is mostly concentrated in July-August on days with higher humidity, so the planting density must be high, maintaining good ventilation. After onset, generally spray 40% carbendazim suspension concentrate 600 times solution or 50% thiophanate-methyl 800 times solution 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. Next is the handling of pathogens after onset. The pathogen parts must not be allowed to come into contact with the plants again. I hope these methods can provide useful information for everyone. Dear friends, please continue to follow Qinnong Web!