I have used some poisons in the past but I cannot do it due to the Wren family that made a nest in the nest box I put out right next to the iri's. They have babies now and I see the parents looking for whatever they eat in and among the iris so I just am checking them by hand. I found signs of the borers on one iris I have all by itself. It is done blooming and I cut off the stalks and noticed the jagged edges and slime. I cut the leaves, but no borers inside. I waited to late to check. Oh well. They can't get them all, can they? Last year I found 3 in one rhizome of one lily and tossed it.
