Rose culture: what is rose rust? How to prevent and cure

What is rose rust? How to prevent and cure rose flower rust mainly harms buds, leaves, twigs, petioles, receptacles, pedicels and other parts of rose. It mainly occurs on buds and leaves. During the sprouting period in spring, the base of the diseased bud was swollen, and a large amount of orange powder grew in 1-3 layers of scales, like a small yellow flower; some bent and died after 15-20 days. After the young leaves were damaged, the yellow punctate sporophore was clustered on the front of the leaf, and then an orange-red spore pile was formed on the back of the leaf. After being infected by bacteria in autumn, the axillary buds withered and died after overwintering. Rose flower rust overwintered mainly by hyphae in the diseased buds of rose. In late March, the disease began to occur when the diseased buds germinated, produced summer spores and spread infection to the leaves. The winter spores on the diseased leaves can also survive the winter and germinate in the following spring to produce basidiospores, infect the tender shoots of young leaves, produce sexual spores and rust spores, and rust spores infect the leaves and produce summer spores. Summer spores can be produced many times and repeatedly enlarge the infection, and the incubation period is as short as 7 days. The disease occurs in the leaves in late April every year. The peak period is from late May to early July. August can be ten days. When the average temperature was above 27 degrees, the disease did not develop, and when the temperature was above 28 degrees, the summer spores did not germinate. After September, only axillary buds occurred. Rain Water many and uniform years, the disease is serious. Rose rust can be controlled by the following methods: (1) timely removal of diseased buds, examination from late March to April, and immediate removal and destruction of diseased buds. Generally, the rate of diseased buds is less than 0.5%, and spores can be prevented from spreading after removal. (2) spraying 1 or 2 times before the peak period of the disease in early April or late August can control the development of the disease. You can choose 50% chlorothalonil 600x solution, or 50% acetonitrile 500x solution, or 50% thiram 500x solution, or 25% trimethoprim wettable powder 1500 times solution. 0.1 stone sulfur mixture can also be sprayed before spring germination, or 0.2 stone sulfur mixture can be sprayed at the initial stage of the disease. Click to get more rose planting techniques click to get more flower planting techniques