1. Symptoms: the disease occurs in summer, mainly endangering the leaves of Yale dance. At the onset of the disease, the leaves grow gray spots, making the surface part yellow. On the back of the leaves, dense gray white mycorrhizal layer was formed and gradually extended to the surface, which eventually resulted in the leaves drying or rotting.
2. Control method: remove and destroy the diseased leaves in time. When the disease is serious, it needs to be treated by spraying the plant or filling the root with brucine.
1. Symptoms: the disease is mainly caused by rust, which mainly damages its leaves and stems. At the onset of the disease, rust brown spots will appear on the epidermis of the stem, and gradually expand. When serious, the stem and leaves will be covered with rust spots.
2. Control method: cut off the diseased leaves in time to make them sprout again. It is necessary to spray the plants with diniconazole for treatment.
1. Symptoms: Generally, it lives on the branches and leaves of plants and sucks the juice of plants. At the onset of the disease, the leaves will wilt and turn green, unable to carry out photosynthesis. If it is serious, it will cause dead leaves.
2. Prevention and control method: when the disease occurs, the plants can be sprayed with drugs such as jieshijing and quick killing, once every three days, three to four times in a row.
