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Product Label SDS Sheet

Hydrothol 191 with alkylamine endothall is a selective, rapid-acting, contact herbicide and algaecide. Very effective against a broad spectrum of submersed weeds. Hydrothol 191 is effective at controlling all forms of algae (filamentous, plankton, macro) at dosage rates up to .3 PPM.

It is critical to realize that Hydrothol 191 is very toxic to fish when applied incorrectly. Therefore, use of Hydrothol 191 is reserved for certified aquatic applicators.

The physical form, mode of action, and general usage of Hydrothol 191 liquid are similar to Aquathol K.

When treating lakes or ponds with Hydrothol 191 liquid begin at the shoreline and work toward the center. Apply parallel to the shoreline. This will herd fish away from the treated area into deeper untreated portions of the lake or pond.

Water treated with Hydrothol 191 liquid should not be used for irrigation or human and animal consumption for 7 to 25 days depending on the application rate.

Application

Hydrothol 191 is surface sprayed evenly over mat algae and injected under the water's surface for planktonic algae, macro-algae, and rooted vegetation. Following treatment, algae typically will die within 1-2 days while rooted vegetation typically requires 1-2 weeks for full effectiveness to be observed.

Size

Availability

Ordering

2.5 Gallon Container
treats up to 5 acres

Online Purchase
Not Available

Call
1-800-442-6648

 

Effectiveness

PONDWEEDS Excellent
CURLY LEAF PONDWEED Excellent
SAGO PONDWEED Excellent
CHARA Good
COONTAIL Good
ELODEA Good
EURASIAN MILFOIL Good
FILAMENTOUS ALGAE Good
HYDRILLA Good
NORTHERN MILFOIL Good
PARROT FEATHER Good
PLANKTONIC ALGAE Good
AMERICAN LOTUS Fair
SPATTERDOCK Fair
WATER PRIMEROSE Fair
WATER SHIELD Fair
WHITE WATER LILY Fair

 

Water Use Restrictions

Active Ingredients: Dimethylalkylamine salt of endothall
Weight % Active Ingredient: 53.0
EPA Reg.No. 4581-172-82695
Number of Days
Human Drinking 7 - 25
Human Swimming 0
Human Fish Consumption 0
Animal Drinking 7 - 25
Turf Irrigation 7 - Newly Seeded Only
Forage Irrigation 0
Food Crop Irrigation 0

Apply Hydrothol 191 at a rate of 0.7-4.0 gallons per acre/ft (0.5-3 ppm) for control of aquatic weeds. Species-specific application rates can be found on the Product Label.

For Best Results

For best results, Hydrothol 191 should be applied as early as possible after weeds appear or when they are actively growing. Contact time with weeds should be at least 2 hours.

Begin application in spring as water temperature warms to 50ยบ F and above. Early treatment when growth first appears or begins to create a nuisance will reduce the amount of Hydrothol 191 needed. Early treatment will also reduce the amount of dead plant material which should be removed or left to naturally decompose allowing the nutrients within the dead plant material to be released into the water column.

Heavy, out of control growth may require more than one application or physical removal to gain control. For best results, use under conditions of minimal water flow.

Notices

Treatment effectiveness depends on density of vegetation and time of year at which the herbicide was applied. In extreme cases 2 to 3 treatments per season of Hydrothol 191 may be needed to adequately control vegetation problems.

Do not use in water containing Tout, Koi or hybrid Goldfish.

*All pesticides can be harmful to health and the environment if misused. Read the label and follow directions. Consult with your local regulatory agency before applying herbicides and algaecides to public waters. There are herbicides from other states that are either not licensed in Wisconsin or Illinois, or are not recommended by ABI.

A WI DNR Aquatic Plant Control Permit or DATCP Fish Farm License is required in WI in order to apply algaecides or herbicides. In addition ponds and lakes with overflows not contained on the property are required to obtain a WPDES permit. Illinois Residents are required to obtiain NPDES permits through the Illinois EPA.

In order to apply chemicals in liquid form within Wisconsin, the applicator must be licensed with the State.

Recommendations of pesticide or treatments for specific algae or aquatic plants are provided for general information purposes only - no warranties are expressed or implied.

* We do not ship EPA registered Algaecides or Herbicides to the following states:

Alaska - California - Connecticut - Delaware -  Hawaii - New Hampshire - New Jersey - New York - Maine - Maryland - Massachusetts  -Oregon - Rhode Island - Washington State - Vermont (for additional information about these restrictions please see shipping or terms and conditions).

 

Michigan Shipments

Aquathol K, Reward, Weedtrine D, & Sonar products can not be shipped without a permit on file.

This product ships via LTL Freight (Semi)