I have hundreds of new tall bearded irises that I planted last summer at the proper time and they were growing and doing well. I have made a large investment and plan on a selling the rhizomes at some point.

I have noticed as this season has progressed some of the irises failing to grow, looking weak and turning brown.

We have had an unusually warm spring in Western Washington state and not much rain.
So today I dug up some of the ones that look like they are dying and discovered wire worms.

I have searched the internet for methods to kill them and just not sure
what to do and I am in a panic that I may lose my large investment.

Should I dig up all the weak looking ones and remove the wire worms, try the potato method or is there a quick and effective pesticide that can be recommended?

Thanks so much for your time and any help.