Variegation mainly occurs in leaves, and the diseases of different degrees will have different degrees of performance, mainly divided into four types: Star spot, spot spot, spot and scorch. According to the severity of the disease, the spots will change in turn, and when serious, the whole plant will die.
Pay attention to watering and keep the basin soil moist without ponding. When it is placed outdoors for maintenance, pay attention to rain protection or timely drainage.
When the disease comes on, spray chemicals in time to prevent and treat it. You can choose Bordeaux solution to dilute the spray. The concentration should be low. Spray 3-5 times.
Clove powdery mildew is very common. When it comes on, there will be sporadic spots on the leaves, and then gradually expand. The leaves will be covered with white mold layer and mycelium. Finally, the white mold layer will turn into a white private sparse network, and gradually appear black small particles until the plant dies.
Prune in time, remove the fallen leaves, cut off the disease and insect branches and thin branches, and make preparations for overwintering. During the growth period, prune the branches that are too dense to facilitate ventilation and light transmission.
Spray the medicine in time before the onset of the disease, and you can choose 50% Triadimefon or phenytoin. Spraying is the most effective and fast solution.
Black spot mainly damages the leaves. Round or irregular spots appear on the leaves, which are brown or dark brown and have ring lines. Black mold will appear on both sides of the lesion, and the lesion will gradually expand, leading to the whole leaf defect.
After defoliation, clean up the dead leaves in time to reduce the source of infection.
Spray agent in time, you can choose chlorothalonil powder, dilute with water and spray.
It mainly damages the leaves of Syringa oblata and is the main disease of Syringa oblata. At the early stage, there will be round spots on the leaves, with brown fine lines on the edge and light brown in the middle. Later, there will be dark brown fluffy objects on the combined plate. When the disease is serious, the leaves will be covered with spots. The symptoms of brown spot and black spot are almost the same.
Do a good job of prevention. After the clove sprouts and grows new leaves in early spring, spray the solution of benjunling or carbendazim in time, once every 10-15 days, twice or three times.
