Pear rust, it is suggested to use difenoconazole or kresoxim-methyl or bromothalonil in the early growth stage (these ingredients are safe and do not inhibit growth).

In the middle and late growth stage, it can be controlled by myclobutanil, tebuconazole, hexaconazole, difenoconazole, propiconazole or fluorosilicone (note that excessive dosage will inhibit growth).

Use ingredients alternately, and don't use the same pesticide ingredients continuously.