Three of your items help control Chara 1. Ducks if they can reach the Chara will eat it. 2. Crayfish will eat a lot of it when crays are common to abundant. 3. Carp by making the water turbid will reduce light penetration which Chara needs for growth.
Common lawn herbicides have little impact on Chara growth.

Last edited by Bill Cody; 10/03/16 08:52 AM.

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