I do live in a farming community in Ontario Canada. It is very rare that any farmer uses pesticides. We do use herbicides to control weeds. Of them the only one that is a problem that is used is atrazine and it will travel with water.

I rarely see any ell grass or water cress. Lots of green and brown algae depending on how warm the water gets.

How long to you leave your trap in the water. The land is so well tiled that I have lose many minnow traps with an over night rain.

Cheers Don.

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7/8th of an acre, Perch only pond, Ontario, Canada.