Duckweed maturate in ponds that are stagnant , hold in fertilizer or manure runoff , or do n’t have enough agitation and aeration from wind , waves or running water system . It can be quite a nuisance in decorative pond and can take over the intact aerofoil without some physical body of duckweed control . Options to kill it admit herbicide , aeration and adding creatures that eat the duckweed .
Aerating
Disturbing the piss aerofoil will make the pond a less favorable environment to duckweed . Many pool owner do this simply by raking up the duckweed as it arises with a long pool - cleaning rake . Another option is to set up aerating devices at the margin of the pond , or adding fountains to the pool to keep the piss surface moving .
Herbicides
Aquatic herbicide are usable from pool , pond and landscape painting suppliers , and range count on the season , severity and location of the duckweed . Many of them require multiple software , and the pond will likely not be dependable for use during treatment . Some pool herbicides used by pond care companies against duckweed in particular are PondWeed Defense and RedWing . These are best used in ponds with large piddle turnover rate or ace that are not hold in . Another weedkiller designed to work on duckweed is anticipate Reward .
Fish
Some Pisces the Fishes , when introduced into a pond , will clear it of duckweed . Goldfish , koi and carp will use up duckweed in some amount . Grass carp are ordinarily used for this function and lick well in smaller pond . However , putting these fish in a pond also will be given the pool toward alga rosiness , as they create an organic cycle of waste and intellectual nourishment in the pool . Note they are restrict in some area , such as near the Great Lakes and their divide .
Carotene Inhibitors
There are a few pond weedkiller uncommitted that will kill off duckweed and other aquatic weeds by non - toxic treatments . These include White Cap and Sonar , both of which work by maintain the duckweed from producing the provitamin A it take to hold out . Without carotene , the chlorophyl in the weeds breaks down quickly and the works will die . These product are often considered safer than harsh chemical substance herbicides , but work best in larger ponds .
Dredging
If an gigantism of duckweed persists , the soil in the pond bottom may be full of flora - supporting nutrient from farm overflow or brute wastefulness . To fix the job once and for all , consider having the pool bottom dredged up and transfer .
