QUESTIONHow do I prevent rust on roses? What is the best spray to use? ANSWERRust on roses and other plants is a fungal infection and as with all fungal infections on plants, prevention is easier than cure. In other words, good pruning during the winter months will ensure good air circulation through the plant. At the time of budburst, during March/April, drench the plant and the soil around it with a solution of copper sulphate and water.

Source: Irish Examiner September 14, 2021 10:30 UTC