esshup - My only herbicide use near the ponds is "wiping" for willow trees since they initially sprout by the hundreds and then whittle down to just a couple volunteers/year over time. I use herbicides in other areas like Tordon cut-stump treatments on invasive shrub honeysuckle, but have mostly been successful with biological control in the ponds. The "weeds" in the twin duck ponds don't really bother me, but I am curious how papershell crayfish might affect it. At least this might test my hypothesis that they controlled the curly leaf pondweed in the SMB/YP pond. Not at all against using chemical controls according to the label, but rather find trying biological controls to be fun in my native habitat areas. We need some pests for the Asian honeysuckle! Has been great seeing how mites/viral-disease has decimated multiflora rose in my area,