WeedtrineD

SePRO · EPA Reg 67690-92 · Herbicide Document last checked 2026-05-30

According to the label From the product label

These details were extracted from this product's label PDF. The label is the law. Confirm every rate, site, restriction and safety requirement against the label before mixing or applying. Check for a state supplemental label; a product may be restricted or prohibited in a state or site even when a rate appears below. · EPA registration data for Reg. 67690-92 →

Weedtine D Aquatic Herbicide is a non-volatile herbicide designed for controlling submerged, floating aquatic weeds and certain filamentous algae. The active ingredient is Diquat dibromide at a concentration of 8.53%. It is intended for use in and around still waters such as lakes, ponds, and ditches. The product works by being absorbed by the weed, with herbicidal effects typically visible within a few days. For optimal results with algae, a pre-treatment with Cutrine Plus algicide is recommended. When applying to submerged weeds, the method varies based on the season: in early season, it can be applied in strips or diluted; in late season, it should be applied in strips no more than 20 feet apart. Floating weeds and duckweed require dilution with a non-ionic surfactant. Handling notes: This product is toxic to aquatic invertebrates and must not be applied directly to water except as specified. Users must wear appropriate Personal Protective Equipment (PPE), which may include chemical-resistant clothing, gloves, eyewear, and a dust/mist respirator depending on the application method. Always wash hands before eating, drinking, or smoking, and wash clothing separately from other laundry. Do not apply to muddy water or under conditions of high wind and wave action. Use only non-ionic surfactants when mixing.

Pests covered (6)

Submerged weeds (Naiad, Bladderwort, Watermilfoil, Coontail, Elodea, Pondweeds)Floating aquatic weeds (Pennywort, Salvinia, Water Hyacinth, Water Lettuce)DuckweedMarginal weeds (Cattails)Filamentous algae (Spirogyra spp. and Pithophora spp.)Aquatic Weeds, Submersed Weeds

Areas treatable (1)

Still lakes, ponds, ditches

How to treat each type of area 5

Still lakes, ponds, ditches

Target pest	Location	Rate	Unit	Dilution	Label notes
Submerged weeds (Naiad, Bladderwort, Watermilfoil, Coontail, Elodea, Pondweeds)	Outdoor	5 to 10	Gals./Surface Acre		Apply in strips 40 feet apart (early season) or 20 feet apart (late season).
Floating aquatic weeds (Pennywort, Salvinia, Water Hyacinth, Water Lettuce)	Outdoor	2.5 to 3.75	Gal/Surface Acre	64:1 with non-ionic surfactant	Use higher rate for late season application.
Duckweed	Outdoor	5	gal/surface acre	25:1 with non-ionic surfactant	Apply at rate of 5 gal/surface acre; re-treatment may be necessary.
Marginal weeds (Cattails)	Outdoor	5	gal/surface acre	19:1 with non-ionic surfactant	Apply before flowering for best results.
Filamentous algae (Spirogyra spp. and Pithophora spp.)	Outdoor	0.5 to 1.5	ppm		Apply in the same manner as submerged weeds.

Mixing instructions 4

For pests	Finished strength	Label notes
Submerged weeds		In early season, dilute at least 5:1 with water (21 fl. oz. per gallon of water). In late season, use a 2:1 dilution.
Floating aquatic weeds	64:1	Requires use of an aquatic non-ionic surfactant.
Duckweed	25:1	Requires use of an aquatic non-ionic surfactant.
Marginal weeds	19:1	Requires use of an aquatic non-ionic surfactant.

Worker safety

Re-entry interval (REI) 3 days (for 8-10 gal/acre rate); 2 days (for 4 gal/acre rate); 1 day (for 2 or 3 gal/acre rate)

PPE required Chemical-resistant clothing (long-sleeved shirt and long pants), protective eyewear, chemical resistant gloves, chemical resistant footwear (plus socks), chemical resistant headgear for overhead exposure, and a dust/mist filtering respirator with NIOSH approval (prefix TC -21 C) when mixing, optimizing, or loading.

Timing & weather

Avoid stirring sediment during application.
Do not apply under conditions of high wind and wave action.

Use restrictions 6

Do not apply to muddy water.
Do not apply to plants covered with mud deposits.
Do not apply under conditions of high wind and wave action.
Do not contaminate water when disposing of equipment wash waters.
Not for sale or use in New York without Supplemental Special Local Needs Labeling.
Do not apply to areas where commercial processing of fish resulting in production of fish protein concentrate or fish meal is practiced.

Label SDS

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Document text and citations

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Reference only. Always read and follow the most current EPA-approved label on the product container. State and local restrictions may apply that are not reflected in this digitised copy. Verify the EPA registration number and revision date before use.