What to Do If the Leaves of Epipremnum aureum Have Black Spots
Epipremnum aureum, as a common indoor ornamental plant, often encounters the problem of black spots on its leaves during maintenance. These black spots not only affect the ornamental value but also serve as a health alert from the plant. This article will systematically analyze the causes of black spots and provide solutions from pathological prevention and control to environmental regulation.
One, Pathological Prevention and Treatment of Epipremnum aureum Black Spots
1.1 Identification and Treatment of Leaf Spot Disease
Fungal leaf spot disease is the primary cause, initially presenting as small yellowish spots on the edges, which later develop into black spots. Diseased leaves should be immediately pruned with a disinfected scissor 1cm outside the healthy area to prevent the spread of pathogens.
1.2 Drug Prevention and Treatment Plan
Use a 50% carbendazim 800x solution or a 75% chlorothalonil 1000x solution, spraying once a week for three weeks. Focus on spraying the back of the leaves and the junction of the stem, and maintain good ventilation for 3 hours after application.
Two, Key Elements of Environmental Regulation
2.1 Temperature Management Techniques
Maintain an environment above 15℃ in winter, and use a cotton insulating sleeve to wrap the pot at night. In case of frost damage, first move it to a 10-12℃ environment to recover for 2 days before gradually increasing the temperature to the appropriate level.
2.2 Control of Light Intensity
Receive 3-4 hours of scattered light daily, with light intensity controlled between 5000-10000 lux. The east-facing windowsill is the best position, and using a 40% shade net can prevent damage from strong light.
2.3 Optimization of Air Circulation
Maintain an air flow of 0.3-0.5m/s per hour, which can be assisted by a circulation fan. Avoid direct cold air and keep at least 1.5 meters away from the window.
Three, Preventive Maintenance Measures
Regularly apply EM bacteria solution to the roots to enhance disease resistance, and apply water-soluble fertilizers containing humic acid monthly. Keep the substrate moisture between 40%-60%, and using bottom irrigation can effectively prevent moisture residue on the leaf surface.
Through the three stages of etiological diagnosis, environmental regulation, and scientific maintenance, not only can existing black spots be eliminated, but a healthy growth system for Epipremnum aureum can also be established. It is recommended to check the back of the leaves and the base of the stem every quarter, to detect and treat early, keeping the plant lush and green throughout the year.