Tool,man,
guides are supposed to know. The kids at Walmart - nope.
Out of country Angler's are mostly guided and arrive from where WD and other ugly invasives live. We should have made Angler's arriving from countries where diseases originated clean their gear.
But it is too late now. WD is not leaving and wil effect our fishery profoundly.
My last trip to Montana many years ago is when we found out the WD was in the Missouri. Washed down out boats and equipment with bleach in the Craig campground and I never went back.
WD nearly killed sport fishing in the Yellowstone area. Fly shops dropped from 13 to 2. They didn't know about WD - we did and did nothing.
Don