CaptainXTR

SePRO · Copper 9.1% · EPA Reg 67690-9 · Insecticide Document last checked 2026-05-30

About this product

Active ingredient Copper 9.1%

Manufacturer SePRO

Category Insecticide

Full details for CaptainXTR

Source product label ↗ Open the catalog source label while the local copy is reviewed. Verify the product name, EPA registration number, and revision before use. Source safety data sheet ↗ Open the catalog source SDS while the local copy is reviewed. Verify the exact product and revision before relying on it. EPA registration data Reg. 67690-9 — registry reference, signal word and status.

Applicator discussion

Nothing here is label direction — the label is the law. These are notes from other applicators, moderated before they appear. Check the labeling accompanying the product and applicable state requirements.

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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. 67690-9 →

Captain® XTR is a copper-based herbicide designed for use in still or flowing aquatic sites, including golf courses, ornamental ponds, irrigation/fire ponds, aquaculture, lakes, reservoirs, and drainage systems. The active ingredient is a Copper Ethanolamine Complex (28.2%), providing a metallic copper equivalent of 9.1%. It is used to control a broad range of green and blue-green (cyanobacteria) algae, including filamentous, planktonic, and macrophytic types. It can also be used to control submerged weed species susceptible to copper. For flowing water, the product may be applied via drip or metering pump systems. When treating cyanobacteria, users must be cautious of toxin release; if blooms are high density, avoid application to prevent public health risks. Application rates vary based on algae type and infestation level, generally ranging from 0.2 to 1.0 ppm copper. Always ensure proper dilution and follow specific instructions for different water types (e.g., low DOC or low pH waters).

Pests covered (2)

Green and blue-green (cyanobacteria) algae (filamentous, planktonic, macrophytic)Submerged weed species

Areas treatable (2)

Still or flowing aquatic sites (ponds, lakes, reservoirs, canals, etc.)Aquatic sites

How to treat each type of area 2

Still or flowing aquatic sites (ponds, lakes, reservoirs, canals, etc.)

Light to heavy

Target pest	Location	Rate	Unit	Label notes
Green and blue-green (cyanobacteria) algae (filamentous, planktonic, macrophytic)	Both	0.2 - 1.0 ppm copper	ppm	For filamentous algae, use higher rates on heavy blooms or mats.

Aquatic sites

Must be susceptible to copper.

Target pest: Submerged weed species
Location: Both

Mixing instructions 2

For pests	Location	Finished strength	Label notes
Algae	Still water	0.2 - 1.0 ppm copper	Refer to Table 1 for specific gallon per acre foot rates based on algae type.
Algae	Flowing water	0.2 - 1.0 ppm copper	Use Table 2 or the provided formula (cfs X desired ppm = quarts/hour) to determine drip rate.

Worker safety

PPE required Coveralls worn over short-sleeved shirt and short pants; socks and chemical resistant footwear; chemical-resistant gloves (Barrier Laminate, Butyl Rubber ≥ 14 mil, Nitrile Rubber ≥ 14 mil, Neoprene Rubber ≥ 14 mil, Natural Rubber ≥ 14 mil, or Polyethylene, Polyvinyl chloride ≥ 14 mil, or Viton ≥ 14 mil); protective eyewear (goggles, safety glasses, or face shield).

Timing & weather

Apply when target vegetation is actively growing.
For filamentous algae, apply early in the season or when regrowth begins.
Avoid application during high density cyanobacteria blooms to prevent toxin release.

Use restrictions 4

Do not apply to crops, ornamentals, grass, or other desirable plants.
Do not exceed 1.0 ppm copper in any single application.
In certain water conditions (low pH or low DOC), toxicity to non-target aquatic organisms increases.
In situations where rapidly reproducing toxic algal species pose a public health threat, obtain authorization from state/local authorities before applying.