Causes and treatments of yellow leaves of Sophora japonica

1. Malnutrition

1. Reason: Sophora japonica is a tree species that likes to grow on refined and fertile soil. Although it has a certain ability to tolerate barrenness, if it is insufficiently fertilized for a long time, it can only support its own growth. Some leaves may not receive nutrients and gradually turn yellow.

Treatment method: When this happens, add fertilizer as soon as possible. For daily care of locust flowers, it is best to fertilize once a month, so that the locust tree can grow better and bloom more.

2. Occurrence of pests and diseases

1. Reason: Pests such as leafhoppers, termites, longhorn beetles, beetles, aphids, etc. will harm the growth of Sophora japonica trees. Pests will gnaw on its branches and leaves, causing malnutrition of the trees and causing the leaves to gradually turn yellow. Of course, diseases such as damping-off and rot can also cause leaves to turn yellow.

2. Treatment method: Once the occurrence of pests and diseases is discovered, the diseased branches and leaves can be removed and the corresponding pesticides can be sprayed. If it is a disease, choose medicines and supplements for application and spraying. After the situation improves, it is necessary to spray pesticides within a certain period of time to prevent the recurrence of diseases and pests.

3. Unsuitable soil

1. Reason: Sophora japonica likes breathable, loose sandy soil. If the soil is too sticky and has poor air permeability, it will cause difficulty in drainage. Moreover, the soil easily becomes compacted, making it difficult for roots to grow, causing trees to grow slowly and their leaves to gradually turn yellow. In severe cases, the soil may even die.

2. Treatment method: Once the soil becomes compacted, it is necessary to loosen the soil in multiple directions immediately. Appropriate measures such as sand filling can be taken without damaging the root system to improve the soil environment.