It seldom infects diseases at ordinary times. In the process of curing, there may be some white powder on the leaves. Many people think it is powdery mildew. In fact, it is not. It is just a natural phenomenon. Now there is no direct evidence to prove that it is a disease, so we don't need to worry too much.
If there is a problem in the maintenance method, it may be infected with bituminous coal disease. At the beginning of the disease, there will be small dark brown mould spots on the surface of the leaves, which will gradually turn gray black in the later stage. The disease needs to be cut off in time, and it needs spraying with Bordeaux and methyl tozin.
1. Mite: this pest will make the leaves curl inside, seriously affecting the ornamental. The control of this pest can be done by spraying peptide nitrogen on the leaf surface, paying more attention to protection and reducing the possibility of this disease.
&2. Root knot nematode: root knot nematode may grow at the root position, damage the root, affect the absorption function, and cause the whole plant growth to be affected. Disinfect the soil in advance, and spray it with bromochloropropane emulsion.
3. Scale insects: they may be infected with scale insects, gather together to suck juice, and can be sprayed with low toxic insecticides.
