Diseases and Pests of White Peony and Their Control
The White Peony, admired for its elegant flower posture, is favored by horticulture enthusiasts. However, it often suffers from diseases and pests during cultivation. This article systematically analyzes the identification characteristics and scientific control methods of three typical diseases and pests, and also provides special preventive maintenance techniques to promote healthy plant growth.
Analysis of White Peony Disease Control System
Black Rot Identification and Emergency Response
This disease commonly appears during the plum rain season, initially manifesting as brown water-stained spots on the leaf edges, which spread to the stem to form black rot bands within 48 hours. When the temperature exceeds 28℃ and the humidity is above 75%, the pathogen spreads at an accelerated rate. In addition to environmental factors, wounds caused by scale insects can increase the infection rate by 60%.
Staged Treatment Plan for Black Rot
At the early stage of the disease, the plant should be isolated immediately, and the affected part should be cut out 3cm outside the healthy tissue using a sanitized scissor. After applying 50% carbendazim wettable powder (diluted 1:800) to the cut, it should be placed in a well-ventilated, shady area to dry. For replanting, it is recommended to use a sterilized matrix of珍珠岩:蛭石=2:1, which can reduce the risk of secondary infection.
Comprehensive Control Measures for Sooty Mold
This fungal disease is characterized by a layer of gray fungal hyphae covering the leaf surface, leading to a 40%-60% reduction in photosynthetic efficiency. In addition to regularly spraying 70% thiophanate-methyl (800 times liquid), it is essential to focus on controlling honeydew-excreting pests such as aphids and whiteflies to cut off the transmission媒介.
Systematic Control of White Peony Pests
Ecological Control Technology for Scale Insects
This pest is most prevalent in late spring and early summer, with the insects often gathering on the midrib of the leaf's underside. Initially, they can be physically removed with a 75% alcohol cotton swab. For large-scale outbreaks, it is recommended to use a 22% spirotetramat suspension concentrate (4000 times liquid) for root drenching, which can provide effective control for up to 45 days.
White Peony Health Maintenance System
Establish a preventive management system: apply decomposed soybean cake fertilizer monthly in spring and autumn to enhance resistance; use陶盆+赤玉土 (with a particle ratio >60%) to ensure root aeration; set a 30cm plant spacing to ensure air circulation. Regularly use systemic fungicides for preventive treatment, which can reduce the disease incidence rate by 80%.
By accurately identifying disease symptoms, adopting a staged treatment plan, and establishing a preventive maintenance system, the pest and disease resistance of white peonies can be significantly improved. It is recommended that growers conduct systematic inspections monthly, address issues promptly, and配合 environmental control to achieve ecological pest control.