We had a beautiful showing of tall iris this spring from tubers I've had for years.. Afterward the plants turned yellow and tan. We have cut away most of the damaged follage, but a few remain. (see pictures). I fear a heavy invation of iris borers. Am I correct? Do I need to pull all tubers in this bed and dispose of them to help protect the neighbors? I live in a small attached cluster of homes, so other gardens with iris are close by. Will I ever be able to replant iris in this area? Can I plant other annuals, perenials, or a shrub there?