How to Solve the Black Spots on the Leaves of Epipremnum aureum
Epipremnum aureum, as a common ornamental plant in homes, often encounters the issue of black spots on its leaves during the maintenance process. These black spots not only affect the ornamental value but may also indicate health issues in the plant. This article will systematically analyze the formation mechanism and solutions of black spots from four dimensions: environmental control, disease prevention, and treatment.
Light Regulation and Black Spot Prevention
Bi-directional Impact of Light Imbalance
Although Epipremnum aureum is shade-tolerant, long-term exposure to a fully shaded environment can hinder chlorophyll synthesis. It is recommended to set a scattered light area 1.5 meters away from the east-facing windowsill in spring and summer, and in autumn and winter, it can receive 2-3 hours of direct sunlight daily. When using a lux meter to monitor, maintaining a range of 500-2000 lux is best.
Ventilation System Optimization Solution
Three-Dimensional Air Circulation Construction
Enclosed spaces can lead to CO₂ concentrations exceeding 800ppm. It is recommended to open windows for ventilation twice a day, each for 20 minutes. When using a circulation fan, set it to low speed and avoid direct blows to the plant. When the environmental humidity is greater than 70%, bamboo charcoal packets can be placed to assist in moisture removal.
Temperature Gradient Management Techniques
Seasonal Temperature Control Strategies
During the winter heating period, avoid placing the plant within 3 meters of a radiator. It is recommended to use a thermometer for continuous monitoring, maintaining a growth range of 15-28°C. When the nighttime temperature drops below 12°C, use double-layer PE insulation film to cover, ensuring there are ventilation holes.
Comprehensive Leaf Spot Disease Control System
Combination of Biological and Chemical Control
After diagnosing leaf spot disease, isolate the infected plant first. Use alcohol to disinfect the pruning shears and apply wood ash to the cut surfaces. Alternate between using a 50% carbendazim 800x solution and a 75% chlorothalonil 1000x solution,喷洒 every 7 days for 3 consecutive times. Using seaweed fertilizer can enhance the activity of disease resistance factors.
By systematically adjusting environmental parameters such as light, temperature, and humidity, combined with scientific medication, black spot symptoms can usually be completely resolved within 2-3 months. It is recommended to establish a maintenance log to record daily environmental parameters and plant status changes to achieve precise maintenance.