My 2.5-3 acre pond has been neglected in terms of shore growth. This has led to a lot of willow trees that are 25ft or so tall. The small island in the main body of the pond also has the same issue. I would like to remove 90% of it. Cutting it only leads to a lot of bushy re-growth. Does anyone know of a bio-safe product to either spray on entire trees, or more preferably paint on stumps?