Disease and control of Hamamelis

The common diseases of witch hazel include leaf spot and anthrax

Leaf spot

The main manifestations of the disease are: damage to leaves, petioles and stems. Round spots appear on the leaves. With the deepening of the disease, the spots gradually increase and the color deepens, from reddish brown to dark brown. It is mostly caused by fungi, bacteria and nematodes

Control method: timely deal with the diseased branches and leaves and burn them. In addition, after discovering this symptom, do not spray water on the plant. If necessary, adopt chemical treatment method, spray with zinc dysen wettable powder, or spray with tobuzin, captan and other agents. Pay attention to alternate use to avoid the virus producing antibodies to drugs

Anthrax

Once it is found that plants may be suffering from anthrax, it is recommended to spray with zinc dysen wettable powder immediately

Pests of witch hazel and its control

The common pests of witch hazel are coir moth and thorn moth

Coir moth

Once the insect sac is found, it should be removed in time and burned intensively. Trichlorfon can be sprayed at larval stage. Adults can use their phototaxis to trap and kill by light

Thorn moth

When dealing with the thorn moth, you can choose to dig out the cocoons in the soil around the tree base to reduce the insect source. Then, permethrin milk can also be sprayed. Pay attention to protection during manual removal. If you are stung accidentally, you can apply it with soapy water, edible alkali, etc