Disease: this disease is caused by a variety of pathogens, mainly manifested as dark brown on the edge of the leaves, light brown or gray white spots in the center, and chlorotic halos around the spots. In the later stage, there will be a lot of black dots on the lesion. When wet, pink mucus can appear.
Solution: in case of illness, it is necessary to spray medicine in time, such as tolbutine methyl, Fumei anthrax and chlorothalonil.
Disease: the common disease at the tip and edge of the leaves will develop into faded green yellow spots. After enlargement, the irregular yellow brown patches will appear. In the later stage, when it is serious, the whole diseased leaves will dry up and grow black granules.
Solution: spray medicine at the end of summer, and spray Bordeaux or bacteriostatic agent.
Disease: these pests mainly suck the juice of flowers. The damaged corolla shows gray white marks and brown spots. The petals will shrink and start to turn brown and wither.
Solution: usually, it is necessary to do a good job in prevention, timely ventilation, promoting contact with fresh air, reducing the possibility of occurrence. After the onset of the disease, it can be treated with chlorhexidine emulsifiable concentrate, aifuding emulsifiable concentrate and other medicaments.
