1, lack of nutrients. Reason: lemon growth should ensure adequate nutrition, so as to supply growth, to ensure normal growth required. If the growth of the lack of iron and other nutrients, it will lead to poor growth of lemon, causing the leaves to yellow and fall down. Solution: In addition to normal fertilization, if the lemon lacks a certain nutrient element, the need for targeted supplemental fertilization, supplementing a variety of trace elements.

2, root rot. Reason: in the lemon maintenance, if you do not pay attention to good watering, fertilization and other maintenance factors, in case the amount of watering and fertilization is too much, the soil is waterlogged or fertilizer is too thick, then it will lead to root rot, causing the normal growth of lemons is affected, causing the leaves to yellow and fall. Solution: control the amount of watering and fertilization, in case of root rot, cut out the root rot, apply medicine and wait for the roots to heal.

3, sun exposure. Cause: lemon suffers from sun exposure, it will also cause the leaves to yellow and fall down. Solution: Move the lemon to a cool and ventilated place, maintain good air circulation, and spray water around the perimeter to promote the recovery of lemon plants.

4, infected with pests. Cause: accidentally infected with pests, will also lead to yellow leaves, a lot of shedding. Solution: first manually capture and kill the pests, the situation is particularly serious leaves off, and then correspond to the spraying agent to treat the treatment.