1. The sun light received by the plant is too strong, which may burn the leaves of the plant in case of strong sunlight, resulting in rust spots on the leaves.
2. If the plant is infected with diseases and insect pests due to improper maintenance, the plant will also grow rust spots due to damage. The longer the disease is, the larger the area of infection is.
1. If the rust spots are caused by too strong sunlight, the rusty leaves can be removed in time, and then the plants can be shaded. But also can't let the plant be in the dark all the time, can let the plant receive some scattered light, otherwise will cause the plant nutrition insufficiency.
2. If it is infected with diseases and insect pests, in order to prevent the disease from continuing to develop to other leaves, it is necessary to trim the leaves suffering from the disease quickly. The trimmed leaves should be burned for treatment, and then sterilized with insecticides or disinfectants, and then put the plants in ventilated places to make the plants recover.
