Most herbicides will have watering restrictions. Most are 3-14 days. Sonar should not be used when irrigating from a pond.
In lakes, when used according to the label, are not toxic to fish. In ponds, the products used will generally hurt fish, but the rapid plant decay can lower oxygen in the water. Treating ½ the pond at a time will help keep the oxygen level remain safe for fish. Certain fish like Koy may be more sensitive to Cutrine Plus and copper sulfate.
No products we sell contain any fishing restrictions when used according to the label.
Sonar can be used in small ponds where the water is relatively contained. If there is heavy outflow, Sonar must be added more frequently or may not be good choice.
With the exception of Sonar, liquid herbicides must be sprayed, covering the entire treatment area evenly. Sonar can be simply poured into a pond in various locations as it stays in the water for up to 90 days.
Apply consistently across targeted area. Apply with a hand scoop or spreader.
Generally you should apply when the weeds are actively growing and the water temperature approaches 60° F.
Planktonic – The type that changes the water color. Usually green (pea soup) or brown or even red.
Filamentous – The type that is mat forming. Prior to forming surface mats it may appear as stringy strands beneath the surface often attached to dock legs, plants and rocks.
Branched – The type that looks similar to a plant. Branched or Chara type algae generally grows densely along the bottom suppressing most other growth. See the descriptions below.