Duckweed (Lemnaceae) family
Small, floating green plants that are often mistaken for
algae. Reproduction is by means of fragmentation. Common
in quiet water such as ponds or back-waters. |
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Common Duckweed (Lemna minor)
Description: Plants are oval and roots may or may
not extend from the underside. |
Watermeal (Wolffia spp.)- Figure B
Description: This smallest of flowering plants,
granular in size, is usually abundant when present and
displays no roots. Plants are often mistaken for seeds.
Extremely difficult to control. |
Star Duckweed (Lemna trisulca)- Figure C
Description: Plants are long and narrow with stalked
appendages and rootlets. |
| Distribution: All three found throughout
the United States. |
Recommended
Control Method: All members of the duckweed
family can be controlled with the following combination:For
areas less than 1 acre, tank mix 1 part Cutrine-Plus to
10 parts WeedtrineŽ-D. Add non-ionic surfactant
and apply at the rate of 1 gallon per 1/5 surface
acre.*
OR
For areas in excess of 1 acre, tank mix 1 part Cutrine-Plus
to 2 parts Reward. Add non-ionic surfactant and
apply at the rate of 1.5 gallons per surface acre.
**Dilute to facilitate even distribution as a fine surface spray. |
Alternate
Control Methods: Fluridone: various liquid or pelletized formulations
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Descriptions and pictures are from the book "How to Identify and Control Water Weeds and Algae", Edited by James C. Schmidt, 5th edition revised 1998, copyright 1976 Applied Biochemists. |
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