Symptoms: this disease is easy to occur when the air humidity is high. At the beginning, it mainly damages the leaves, causing round white spots on the leaves, and then connecting into a piece, which is covered with red powdery mildew. When it was serious, the whole leaf began to turn yellow and dry.
Prevention and control: pay attention to ventilation and light transmission, apply fertilizer and water scientifically, and add some phosphorus and potassium fertilizer, which can improve the ability of disease resistance. In winter, also pay attention to remove leaves and burn them intensively. At the beginning, it can spray 40% dakonine suspension 600-700 times and 20% Triadimefon emulsion 1500 times.
Symptoms: small spots in the shape of water stains will expand and become brown and rotten when the petals are damaged. No matter the petals are damaged, the leaves are also damaged. Start from the edge first. When the weather is wet, they will turn brown and dry.
Prevention and control: in the early stage of the disease, the diseased branch of the diseased flower can be cut off. If it's planted in the open, you can spray oxymoron, promethine, etc. If you plant in a shed, you can smoke.
Symptoms: it is mainly deposited in the flowers, which will suck the juice inside, leading to the early withering of the flowers.
Prevention and control: disinfect the soil before planting, reduce the possibility of occurrence, and spray as soon as possible if infected with pests.
