We would not be able to burn here. Fewer problems with borers not that the irises are away from shrubs & trees. We get to know which plants do better even if a borere attacl Found holes in the rhizomes of historic 'The Black Douglas' but no rot. If you look right now & see wet slimy leaves, those are the plants with the borer grub. When weeding in the fall, look for the shiny brown pupae in the soil & smash those.
