Powdery mildew is a common disease of rose. It is very harmful. Most of them will be infected for the first time in late May. They will spread continuously in June and July. When the leaves are damaged, a layer of white powdery objects will be born on the surface, and the young shoots will not escape. When it is serious, it is possible that the leaves will start to fall off slowly or even die. At that time, we need to carry out timely targeted treatment. When growing in spring, we can alternately use some drugs to spray it properly. After spraying the drugs, its white powder position will become dark gray, and gradually start to dry and disappear. In the autumn rain time is its sudden peak, during which we must spray medicine many times, we can reduce the injury to the lowest, direct and thorough prevention and treatment.
This is also a symptom of the most frequent infection of Rosa chinensis. Its remnants usually spend the winter with the Rosa chinensis. When it rains or watered, it will spatter and insects will spread. Generally, the most appropriate temperature to cause the disease is about 26 degrees, or the season with more rainfall, especially the newly planted or weak growing plants are more vulnerable to damage, so we should timely clean the leaves, remove some sick leaves in time, and prune those sick plants in winter, and pay attention to watering, not spraying.
Aphids also directly do great harm to it. They will absorb the juice nutrition on the shoots of plants, so that the flower bud will grow very deformed directly, and the nutrition will not keep up with it, and it is also indirectly easy to infect other diseases. Then we need to spray some medicine on its plants in time, basically once every seven days, just spray it two or three times.
