Pond Boss Forums INTRO Questions & Observations Hybrid stripers in smaller ponds

Brian - For what it is worth, duckweek AND bushy pondweed (Nejas spp.) are easily controlled with approximately 12 oz. of SONAR AS in a 1/3-acre pond. A 5-gal bucket is sufficient for "application equipment".
However, such a herbicide treatment should be conducted much earlier in the season, to maximize its effectiveness and to reduce the risk of D.O. problems.
Your pond water is probably very clear. If so, and a herbicide treatment is considered, you may wish to consider a fertilization program to get a plankton bloom going next spring - before filamentous algae kicks into gear. Otherwise, the filamentous algae will make ready use of the bottom-nutients being released from the decomposing plants. The plankons' ability to reduce sunlight penetration should help reduce your filamentous algae problems later in the season.