How to Solve the Black Spots on the Leaves of Epipremnum aureum in Winter
The appearance of black spots on the leaves of Epipremnum aureum in winter is a common cultivation challenge, often caused by insufficient light, sudden temperature drops, poor ventilation, and diseases or pests. This article analyzes the causes of black spots through four sets of real-shot images and provides actionable solutions to help you quickly restore the healthy condition of Epipremnum aureum.
Causes and Countermeasures of Black Spot Disease in Epipremnum aureum in Winter
Light Adjustment Techniques
Although Epipremnum aureum is a shade-tolerant plant, it requires 3-4 hours of scattered light per day in winter. Insufficient light can hinder the synthesis of chlorophyll and reduce disease resistance. It is recommended to move the plant to an east or south-facing windowsill, use a curtain to filter strong light, and rotate the pot weekly to ensure even exposure.
Temperature Control Solutions
15-25°C is the ideal growth temperature, and below 10°C, the root activity stops. You can adopt a stepped insulation method: use a transparent storage box to DIY an insulation cover at 10-15°C; cover with double-layer plastic bags and fill with foam particles at 5-10°C; keep more than 1 meter away from the radiator, and use a humidifier to maintain 40% humidity.
Scientific Ventilation Methods
Open the windows for ventilation from 11:00 to 14:00 every day, using the diagonal window opening method to create an air circulation. In cold regions, you can use a circulation fan with a HEPA filter, set to a low speed, and direct the airflow 1.5 meters away from the plant. After ventilation, immediately spray the leaves with warm water at 40°C to prevent stress caused by temperature differences.
Disease and Pest Control System
In the early stage of leaf spot disease, wipe the affected leaves with garlic extract (1:20); in severe cases, alternate between spraying benzothiazole and pyraclostrobin. Use neem oil for preventive treatment every month, combined with Bacillus subtilis to improve the microbial environment of the potting soil. Regularly check the undersides of leaves for arachnids and remove them with 75% alcohol wipes immediately.
By adjusting light, managing temperature, optimizing air flow, and preventing diseases, combined with stopping fertilization and controlling water (reduce watering by 50%) in winter, you can effectively block the path of black spot formation. It is recommended to conduct weekly leaf inspections, keep a maintenance log to record temperature and humidity changes, and achieve precise winter management of Epipremnum aureum.