The disease mainly damages its leaves, and its transmission is very strong. It can be spread by air flow, rain and other ways. It can also overwinter on the surface of the soil, and harm the meat in the next year's recovery. This disease may occur in all seasons of the year, but the most serious period is August to September, when the temperature is high, if the air in the breeding environment does not flow, plus rainy days are more humid, it is very easy to have this problem.
Improve the environment, strengthen the flow of gas, and avoid water accumulation when supplying water. At the same time, do not allow the soil layer to be excessively wet for a long time. When the disease occurs, it can be sprayed with drugs and isolated from other plants at the same time. Before winter, the diseased parts shall be removed, and the fallen leaves shall be cleaned up, and the soil can be turned over properly. Reduce the probability of disease overwintering on soil surface.
When this pest occurs, it will seriously affect the ornamental degree of plants. They eat the leaves of plants to survive. When serious, it will cause other problems.
A small amount can be captured manually, or sprayed with drugs. In serious cases, the whole plant should be destroyed.
