The main diseases of sandalwood are powdery mildew and seedling blight, which can be sprayed with 50% thiophanate 800- 1000 times and powdered calcium 1000-2000 times.

The main pests of sandalwood are: borers, butterflies and black cutworms.

Prevention and control methods:

1. During the high incidence period from June to July, the borers used omethoate or trichlorfon for 500 times, and filled the holes with syringes or blocked them with medicinal mud.

2. Pink butterfly: Pink butterfly is the main leaf-eating pest of sandalwood, and its harm is mainly in the larval stage, which is the most harmful to sandalwood. In severe cases, the leaves will be eaten up until the branches die. Butterfly is the main pest of sandalwood. Control method: spray omethoate or trichlorfon 800 times at night.

3. Little cutworms: Little cutworms mainly eat the roots and stems of young trees. Control methods: combined with field management, artificially kill larvae, or spray 800-fold solution of 90% crystal trichlorfon or 50% phoxim EC 1000-fold solution, or spray methamidophos or dichlorvos in the soil during larval stage (but pay attention to safety).

Your sandalwood leaves are probably caused by insect pests. Can you describe them in detail? It is best to have a picture, a leaf and a petiole.