What to Do About Orchid Root Rot
Orchid root rot is a common problem that困扰s many orchid enthusiasts. Once this elegant plant develops root issues, it directly affects its overall growth. This article will systematically analyze the four main causes of root rot and provide actionable treatment solutions to help you restore healthy orchid roots.
Environmental Control is the Foundation of Root Rot Treatment
Golden Rule of Light Management
Most orchids require more than 4 hours of scattered light per day, and varieties like Cymbidium can extend this to 6 hours. It is recommended to use a light meter to maintain a range of 5000-10000 lux, and in winter, place the orchids near a south-facing window. In summer, install a shading net.
Art of Air Circulation Balance
In enclosed environments, keep a circulating fan running for 3-4 hours a day, and in open balconies, avoid strong winds. Use a humidity gauge to monitor and maintain an air flow of 0.3-0.5 m/s.
Coordinated Management of Temperature and Humidity
Use a smart humidifier to maintain 60-70% humidity and keep the day-night temperature difference within 8°C. Especially during the plum rain season, it is recommended to use a dehumidifier.
Scientific Watering to Save Root Rot
Seasonal Watering Schedule
Water in the morning during spring and autumn, in the evening after 20:00 during summer, and at noon during winter. Use a thermometer to ensure the water temperature difference from room temperature is ≤3°C.
Method to Determine Soil Moisture
Use the bamboo stake method: Insert a bamboo stake 2/3 into the potting soil, and check the moisture after 20 minutes. Or use an electronic moisture meter, and water when the value is below 30%.
Water Control Techniques During Special Periods
Gradually reduce water 7 days before the blooming period and increase misting during the sprouting period. During continuous rainy days, switch to the immersion pot method for watering.
Precise Fertilization to Prevent Root Rot
Fertilizer Ratio Plan
Use a balanced fertilizer with N-P-K=20-20-20 during the growing season, diluted to 1500 times liquid. Switch to high-phosphorus fertilizer during the bud differentiation stage and stop using chemical fertilizers during the dormant period.
Safe Fertilizing Distance
Solid fertilizers should be applied 5 cm away from the pseudobulb in a circular pattern, and liquid fertilizers should be poured slowly along the pot edge. After fertilizing, continue to observe for 3 days, and if the leaf tips turn black, immediately rinse the substrate.
Comprehensive Control of Pests and Diseases
Treatment of Fungal Infections
If a soft rot disease is detected, immediately cut off the affected part and soak in a 800 times solution of mancozeb for 30 minutes. Spray a Bacillus subtilis solution weekly for prevention.
Root Pest Management Sequence
Scale insects can be physically removed with a 75% alcohol cotton swab, and root mealybugs require repotting and treatment with thiamethoxam. All treatments should be accompanied by replacing the disinfected substrate.
Through the four-dimensional联动 of environmental regulation, water management, precise fertilization, and pest and disease control, not only can root rot issues be effectively treated, but a long-term mechanism for healthy orchid growth can also be established. It is recommended to perform a root health check monthly, as using a transparent seedling tray makes it easier to observe, allowing the orchid to regain its graceful posture.