Aquatic Vegetation Herbicide Control Water Use Restrictions1 – number of days after treatment before use in private waters only.
|copper sulfate 2||0||0||0||0||0||0|
|diquat||1-3 3||0||0||1||1-3 3||5|
|imazapyr||*14||0||0||0||120 9||120 9|
|triclopyr||*13||0||0||0||0 7||120 8|
1 Aquatic vegetation control can result in a period of low dissolved oxygen which can stress and/or kill fish. It is best to treat most aquatic vegetation early in the growing season, when the plant is rapidly growing. Treating small areas (e.g. 1/4) of pond at a time at 10 – 14 day intervals will allow for decomposition usually without causing an oxygen depletion.
2 If water is for drinking, the elemental copper concentration should not exceed 1.0 ppm (i.e. 4.0 ppm copper sulfate)
3 Depending on forumulation – Read label.
4 Length of use restriction for endothall varies with concentration used. Read label.
5 Do not apply within 0.5 mile of a functioning potable water intake.
6 Do not apply within 0.25 mile of a functioning potable water intake.
7 No restriction on irrigating established grasses but do not harvest hay for 14 days after application. Read label.
8 Or until non-detectable concentrations in immunoassay analysis.
* Water restrictions on 2,4-D vary with formulation, rate, and time of year. Read label.
# Minimum setback distances from potable water intakes required and laboratory tests to determine < 0.4ppm for use. Read label.
@ > 1/2 mile from potable water intake
9 Or until < 1.0 ppb
10 Do not use treated water to irrigate greenhouses, nurseries or hydroponics.
11 Sodium carbonate peroxy-hydrate
12 Water restrictions on 2,4-D vary with formulation, location, rate, and time of year. Read label.
13 Minimum setback distances from potable water intakes required and laboratory tests to determine < 0.4 ppm for use. Read label.
14 > 1/2 mile from potable water intake
15 Do not use water from any treated site for food crop irrication until residues are determined to be less than or equal to 1 ppb.
Additional information is available through the following references and websites
Aquatic Vegetation Identification Card Deck $12.00 includes postage. Produced by Dr. Michael P. Masser – Publication Number B6095
Distribution and Supply, Texas A&M University
PO BOX 1209, Bryan,TX 77806
or order on-line at:
Texas AgriLife Bookstore: agrilifebookstore.org