Why Are There Spots on the Leaves of Epipremnum aureum
As one of the most common indoor ornamental plants, Epipremnum aureum is beloved for its shade-tolerant and easy-to-care-for nature. However, many plant enthusiasts have noticed that their Epipremnum aureum leaves suddenly develop brown spots, which not only affect the plant's ornamental value but also threaten its health. This article will analyze the causes of leaf spots from a professional perspective and provide a systematic prevention and treatment plan.
Analysis of the Causes of Epipremnum aureum Leaf Spot Disease
Environmental Inducing Factors
Prolonged lack of sunlight (daily < 2 hours) leads to a decrease in the leaves' resistance to disease. When the air humidity remains above 70% and the ventilation is poor, fungal spores can rapidly multiply on the back of the leaves. Experimental data shows that the infection rate of Epipremnum aureum in a sealed environment is 3.2 times higher than in a well-ventilated environment.
Common Misconceptions in Maintenance
Over-watering (more than 3 times/week) causes the leaf surface to remain moist for an extended period, using unsterilized garden soil that carries pathogens, and maintaining high humidity during low temperatures (below 15°C) in winter are all key factors in causing leaf spot disease.
Epipremnum aureum Leaf Spot Disease Treatment Plan
Emergency Treatment Three-Step Method
1. Isolate Diseased Plants: Immediately move the infected plant to an isolated space to prevent cross-infection. 2. Precise Pruning: Use scissors sterilized with alcohol to cut off the diseased leaves 2cm outside the spot. 3. Thorough Disinfection: Spray 70% alcohol solution to thoroughly disinfect the original planting area.
Medication Control System
Alternately use benomyl (diluted 1500 times) and azoxystrobin (diluted 2000 times), spraying once a week for three consecutive weeks. Focus on spraying the back of the leaves and maintain ventilation for more than 6 hours after application.
Golden Rules for Epipremnum aureum Maintenance
Light Management Tips
Ensure 3-4 hours of scattered light daily, and provide shade from 10:00 to 15:00 in summer. Rotate the pot weekly (90 degrees) to ensure even light exposure.
Humidity Control Standards
Maintain an environmental humidity of 40-60%, use the "soak pot" method to water (once a week), and complement with morning and evening leaf spraying (suspend in winter). Use a hygrometer to monitor in real-time and avoid leaf waterlogging for more than 2 hours.
Soil Selection Plan
It is recommended to use a mixed matrix of peat soil: perlite: coconut bran = 5:3:2, and replace the soil every six months. When repotting, soak the roots in a carbendazim solution (1:1000) for 20 minutes to effectively prevent soil-borne diseases.
Through scientific maintenance management, Epipremnum aureum can not only recover its health but also enhance leaf luster. It is recommended to wipe the leaf surface with beer solution (1:50) monthly, which can clean dust and also supplement amino acids and other nutrients. Follow these maintenance points to keep your Epipremnum aureum lush and green all year round.