Why Are Banyan Tree Leaves Turning Yellow and Falling Off?
Banyan trees, common ornamental species in southern courtyards, are loved for their unique aerial roots and lush green leaves. However, the problem of yellowing and falling leaves during maintenance often troubles planters. This article analyzes the causes from four dimensions and provides a systematic solution.
Imbalance in Water Management Issues
Typical Symptoms of Waterlogging
Long-term soil moisture prevents roots from breathing, initially manifesting as dull leaves and later developing black-brown spots. When the root rot rate reaches 30%, the leaf fall rate can reach 70%, requiring the use of the bamboo stake test to check soil moisture.
Scientific Watering Plan
Water thoroughly every 7-10 days in spring and autumn, reduce to 5 days in summer but avoid noon, and extend to 15 days in winter. It is recommended to use a terra cotta pot combined with perlite substrate to increase drainage efficiency by 30%.
Abnormal Nutrition Supply Handling
Fertilizer Burn Identification Method
Excessive fertilization results in leaf edge scorching and yellow net patterns between veins. It is recommended to use an EC value tester monthly, maintaining soil conductivity between 1.2-1.8 mS/cm.
Root Repair Techniques
Immediately rinse the roots with water for 2 hours upon detecting root burn, trim the damaged roots, then soak in a carbendazim solution, and replace with a new substrate containing vermiculite to increase survival rate by 50%.
Root Health Maintenance System
Disease Early Warning Signals
In the early stage of root rot disease, the roots have brown sticky liquid and a moldy smell. Regularly apply systemic fungicides to the roots, maintaining a substrate pH of 6.0-6.5 for effective prevention.
Pest Control Strategies
For root knot nematodes, use abamectin 2000 times solution, and combine with solar disinfection to kill 90% of the eggs.
Key Points of Environmental Regulation
Protection Against Sudden Temperature Changes
Initiate protection when the day-night temperature difference exceeds 8°C: use sunshades during the day to reduce temperature by 3-5°C, and use thermal insulation film at night. In northern regions, it is recommended to install intelligent temperature control equipment.
Humidity Balance Plan
Install an automatic misting system to maintain air humidity at 60%-70%, and combine with wet pebbles on the ground to stabilize the microenvironment.
By establishing a four-dimensional maintenance system of water monitoring, nutrition testing, root examination, and environmental regulation, combined with regular pruning and pest and disease prevention, the yellowing and falling leaves of banyan trees can be effectively controlled, restoring the plant to a healthy growth state. It is recommended to create a maintenance log monthly, recording temperature and humidity changes and plant responses, to form a personalized maintenance plan.