Lily Stem Rot and Its Control
As a common aromatic plant in gardens, lilies are favored for their pure white bell-shaped flowers. However, stem rot is a hidden killer threatening their healthy growth. This article will systematically analyze from symptom identification to control strategies.
Lily Stem Rot Pathological Characteristics
Typical Disease Symptoms
In the early stage of infection, the stems and leaves show light yellow spots, which turn into dark brown sunken lesions as the disease progresses. When the humidity is >75%, the inflorescence produces sticky and slippery decay matter. Lesion expansion at the base of the leaves can cause the entire plant to fall over, and a gray mold layer with feces-like sclerotia can be seen in the later stage.
Disease-Causing Environmental Factors
Fusarium fungi multiply 3 times faster in an environment of 28-32°C and continuous high humidity. The incidence rate of cultivation in enclosed spaces is 2.5 times that of outdoor planting, and the risk of infection increases by 67% when cut flowers are stored in paper bags for more than 8 hours.
Lily Stem Rot Control System
Biological Control Solutions
In the early stage of the disease, spray a 1:1:100 Bordeaux mixture once every 7 days, preferably between 9-11 am on sunny mornings. A 500-fold liquid of mancozeb can disrupt mycelium growth, and using it in combination with Bacillus subtilis preparations can improve the effect by 40%.
Horticultural Management Norms
Establish a 3-year crop rotation cycle and avoid cultivating within 50 meters of peony and peony planting areas. Tools need to be soaked in 75% alcohol for disinfection before and after use. Build 30cm high planting ridges before the rainy season to enhance drainage.
Environmental Control Key Points
Keep the plant spacing ≥25cm to ensure ventilation, install humidity monitoring devices to control environmental humidity at 55-65%. Change morning and evening foliar watering to root drip irrigation, and pruning operations should be carried out after the dew has dried.
Through a three-dimensional control system of pathogen control, cultivation optimization, and chemical intervention, the incidence of stem rot can be reduced by 82%. It is recommended to conduct plant health checks monthly, isolate and incinerate diseased plants immediately upon discovery, and establish a complete disease control log recording system.