In the cultivation of stinky peony, rust is a relatively common hazard, the plant will be disturbed, when serious, affect the growth of the plant.
If the rotten peony is damaged by rust, you can spray the plant with 400 times of 20% weixiangling emulsifiable oil for treatment.
Grey mould is also a common disease of rotten peony. It is harmful to the plant, so we must control it in time. In general, you can choose the 2500 times liquid of 50% benomyl fungicide wettable powder to spray plants, which can play a therapeutic role.
When breeding rotten peony, the more common pest is the leaf beetle and the moth, generally in the event of such harm, we should pay attention to the timely spray control.
In general, you can spray some enemy killing agents for treatment.