The Control of Diseases and Pests in Tree Peonies
Tree peonies, as precious ornamental flowers, often suffer from diseases and pests during cultivation. This article systematically sorts out the identification and control techniques of the three most common diseases and pests in tree peonies:牡丹（T-J）disease, stem rot, and red spider mites, to help gardening enthusiasts scientifically care for their plants and create a healthy peony garden.
Key Points for Disease Control in Tree Peonies
Identification and Treatment of牡丹（T-J）Disease
At the early stage,牡丹（T-J）disease manifests as brown sunken spots on the stems, with orange colloidal substances produced when the humidity exceeds 70%. Infected plants should be isolated immediately, and a 75% carbendazim 800x solution should be sprayed weekly, along with the removal and incineration of the affected tissue. Especially during the plum rain season, it is recommended to use drip irrigation technology to control humidity and maintain a plant spacing of more than 30cm to enhance ventilation.
Comprehensive Control of Stem Rot Disease
Stem rot disease causes the necrosis of the vascular bundle. Within 48 hours of onset, the following steps should be completed: ① cut the lesion to 3cm of healthy tissue ② disinfect the incision with potassium permanganate solution ③ treat the new substrate with lime milk. Daily maintenance requires keeping the soil pH between 6.5-7.0, and before the rainy season, dig drainage ditches to ensure the substrate's permeability is greater than 50%.
Pest Control System for Tree Peonies
Red Spider Mite Eradication Plan
For red spider mite pests, a立体 control using 40% omethoate emulsion is adopted: ① spray the undersides of the leaves ② simultaneously disinfect the ground ③ hang yellow sticky traps for monitoring. During high-temperature seasons, applying neem extract biopesticides every 10 days can reduce the egg hatching rate by 75%. Regularly rinsing the leaf surfaces can effectively control the pest density.
Establishing a disease and pest early warning mechanism, using multispectral analyzers to analyze leaf health indices monthly, combined with smart irrigation systems to control temperature and humidity, can reduce the incidence of diseases by more than 60%.