* Environmental stress: Ficus trees are native to tropical climates, so they can be sensitive to changes in temperature, humidity, and light levels. If your tree is exposed to extreme temperatures, low humidity, or too much direct sunlight, it may start to drop its leaves.
* Watering issues: Ficus trees need to be watered regularly, but they should not be allowed to sit in waterlogged soil. If your tree is getting too much or too little water, it may start to lose its leaves.
* Nutrient deficiencies: Ficus trees need a variety of nutrients to stay healthy, including nitrogen, phosphorus, potassium, and magnesium. If your tree is deficient in any of these nutrients, it may start to drop its leaves.
* Pests and diseases: Ficus trees can be susceptible to a variety of pests and diseases, including spider mites, aphids, scale insects, and fungal infections. If your tree is infested with pests or diseases, it may start to lose its leaves.
If you are not sure what is causing the leaves to fall off your ficus tree, it is a good idea to consult with a certified arborist. They can help you identify the problem and recommend the best course of treatment.