General Information


Galleon SC herbicide is a selective systemic aquatic herbicide for management of freshwater aquatic vegetation in: ponds; lakes; reservoirs; marshes; wetlands; bayous; drainage ditches; non-irrigation canals; and slow-moving or quiescent bodies of water; including shoreline and riparian areas within or adjacent to these and other aquatic sites.

Galleon SC may be applied directly into water or sprayed onto emergent foliage of aquatic plants or exposed sediment after drawdown. Depending upon method of application and target plant, Galleon SC is absorbed by aquatic vascular plants through emergent or floating leaves, from water through submersed plant shoots, or from hydrosoil by roots. For in-water treatments, rapid water movement or any condition resulting in rapid dilution of Galleon SC in treated water will reduce its effectiveness. Herbicidal symptoms of Galleon SC include: immediate growth inhibition, a chlorotic growing point with some tissue reddening, necrosis of the terminal bud after 2 or more weeks of exposure, and slow plant death over a period of 60 to 120 days or longer depending upon conditions for in-water applications. The level of control will depend upon timing of initial application, application rate or concentration, exposure period, and weed species. Species susceptibility to Galleon SC may vary depending upon time of year, stage of growth, and water movement. For best results, apply Galleon SC immediately after weeds begin active growth. Application to mature target plants may require higher application rates and longer exposure periods to achieve control.

The label describes both required and recommended uses of a chemical analysis for the active ingredient. SePRO Corporation recommends the use of an Enzyme-Linked Immunoassay (ELISA) test for the determination of the active ingredient concentration in water. Contact SePRO Corporation for the incorporation of this analysis in your treatment program. Other proven chemical analysis for the active ingredient may also be used. The ELISA analysis is referenced in the label as the preferred method for the rapid determination of the concentration of the active ingredient in the water.


- Consult with appropriate state or local water authorities before applying this product. Permits and posting or treatment notification may be required by state or local public agencies. Consult the agency responsible for pesticide regulations for specific details.

- Galleon SC must be applied by SePRO Corporation authorized applicators trained in Best Management Practices for use of the product.

- There are no restrictions on consumption of treated water for potable use or by livestock, pets or other animals.

- There are no restrictions on the use of treated water for recreational purposes, including swimming and fishing.

- Chemigation: Do not apply Galleon SC through any type of irrigation system.

- For post-emergence foliar applications or exposed sediment treatments, Galleon SC should be mixed with a surfactant. Use only surfactants that are approved or appropriate for aquatic use. Use of organosilicone surfactants with Galleon SC is not recommended.

- For treatments out of water, do not permit spray mists containing Galleon SC to drift onto desirable broadleaf plants as injury may occur. Further information on spray drift management is provided in the Spray Drift Management section of the label. APPLICATION TO WATERS USED FOR IRRIGATION Irrigation using water treated with Galleon SC may result in injury to sensitive irrigated vegetation. The following restrictions are required for irrigation use of treated water:

- Do not use water treated with Galleon SC for hydroponic farming.

- Do not apply Galleon SC to water to be used for irrigation of greenhouse or nursery plants. Do not use water treated with Galleon SC for irrigating greenhouse or nursery plants.

- Do not irrigate established food crops, other than rice, if concentrations of Galleon SC in irrigation source water exceed 1 ppb as determined using ELISA or other analytical techniques. Do not irrigate established rice if concentrations in treated water exceed 30 ppb.

- There is no restriction on use of water treated with Galleon SC for turf irrigation, if concentrations are less than 30 ppb. For other non-food crop irrigation (e.g., landscape ornamentals) or for other irrigation uses not described above, confer with SePRO Corporation prior to commencing irrigation if concentrations in treated water exceed 1 ppb as determined using ELISA or other analytical techniques.

- Areas previously irrigated with water treated with Galleon SC may be planted in rice or turf. For other food crops and in areas irrigated with Galleon SC at concentrations exceeding 1 ppb, consult with SePRO Corporation for site-specific risk evaluations before planting.

- Do not apply Galleon SC to actively moving or running waters (i.e. lotic waters) used for irrigation, including rivers and streams. When making applications near an active irrigation water intake, the intake must be shut-off until concentrations in the water are 1 ppb or less as determined using ELISA or other analytical techniques, except when irrigating turf or rice (see restrictions under Applications to Waters Used for Irrigation). The intakes must be shut off for a sufficient period of time to allow penoxsulam in treated water to decrease to 1 ppb or less at the intake before use can resume. Consult with state, federal, or local water authorities before making application near an active irrigation intake.

- Application to Exposed Sediments: Galleon SC may be applied to exposed sediments of dewatered areas of aquatic sites. Upon inundation, all label restrictions apply to the use of water from these treated areas.


The mode of action of Galleon SC is the inhibition of the acetolactate synthase (ALS) enzyme. Weed populations may develop biotypes that are resistant to different herbicides with the same mode of action. If herbicides with the same mode of action are used repeatedly at the same site, resistant biotypes may eventually dominate the weed population and may not be controlled by these products.

This product should be used as part of an Integrated Pest Management (IPM) program that may include biological, cultural, and chemical practices aimed at preventing economic and environmental pest damage. Application of this product should be based on appropriate IPM and resistance management strategies that delay or reduce the development of resistant weed biotypes. Such practices include, but are not limited to, tank mix combinations with dual-modes of action, herbicide rotation (i.e., use of alternate modes of action in subsequent treatment cycles), target plant susceptibility testing, GPSassisted field survey and application methods, detailed in-treatment monitoring of herbicide concentrations to ensure proper dose and exposure period, and determination of optimal timing for treatment of target vegetation based on plant physiology and resource management goals for treated sites.

To delay development of herbicide resistance, the following practices are recommended:

- Treatment with Galleon SC in successive years is not recommended unless conducted in combination with an herbicide with a different mode of action.

- Intensive target plant susceptibility testing in combination with rigorous and quantitative assessments of target plant distribution and health are strongly recommended before, during and after treatment.

- In conjunction with susceptibility testing, follow-up management of any surviving target plants found following treatment with Galleon SC is recommended in the period immediately following treatment with Galleon SC. This proactive follow-up management to contain or limit the spread of any potential resistant biotypes can include the use of contact herbicide or systemic herbicide with a different mode of action.

Refer to label for more specific directions.

Limitations, Restrictions, and Exceptions

In-Water Application to Submersed or Floating Aquatic Weeds

Galleon SC can be applied as an in-water application to control weeds such as hydrilla, Eurasian watermilfoil, water hyacinth, and other susceptible weed species.

Do not make in-water applications to areas subject to rapid dilution of treated water and/or where sufficient exposure with targeted vegetation can not be maintained, such as small spot or shoreline treatments in larger bodies of water. Where greater plant selectivity is desired such as when controlling hydrilla and Eurasian watermilfoil or when targeting more susceptible species, choose an application rate lower in the rate range. SePRO Corporation recommends contacting an aquatic specialist to determine when to choose application rates lower in the range to meet specific plant management goals.

Single In-Water Application to Treatment Zone: Where single applications to whole ponds, lakes, and reservoirs are desired, under typical treatment conditions Galleon SC should be applied at a minimum effective concentration of 25 to 75 ppb. Choose an application rate to meet the aquatic plant management objectives. Application rates necessary to obtain these concentrations in treated water are shown below. It may be necessary to re-treat the body of water if mature or more tolerant vegetation is present in the target area or heavy rainfall has diluted the treatment concentration. If re-treatment is necessary, refer to the Split or Multiple In-Water Applications to Treatment Zone section of the label.

NOTE: The concentration of any single application or sum of all applications must not exceed 150 ppb per annual growth cycle.

Split or Multiple In-Water Applications to Treatment Zone: Split or multiple applications of Galleon SC may be desirable to ensure efficacy overtime, maintain exposure, and enhance selectivity. Under typical treatment conditions or when targeting the most susceptible species, Galleon SC should be applied initially at the minimum effective dose of 10 to 30 ppb to the treatment zone and, through the use of water analysis, add additional Galleon SC to maintain the concentration to achieve specific plant management objectives. Re-treat the water to maintain a sufficient concentration for a minimum of 60 days or until satisfactory weed control is achieved. Higher concentrations and longer exposure times may be necessary when targeting less susceptible species, mature plants, and/or under conditions favorable for slower plant growth. Water analysis using ELISA is recommended to determine the actual concentration of Galleon SC in the water overtime.

NOTE: The concentration of any single application or sum of all applications must not exceed 150 ppb per annual growth cycle.

Apply Galleon SC to the treatment area at the appropriate rate to achieve target concentration. Define both size (in acres) and mean water depth (in feet) of the treatment zone prior to treatment. For each part per billion (ppb) of final concentration of active ingredient in the treatment zone, apply 0.174 fl oz per acre-foot of water.

For in-water applications, the maximum target concentration in any treated area is 150 ppb active ingredient per annual growth cycle.


smartweed, bacopa, Illinois pondweed, southern naiad and spikerush: Susceptibility will likely vary between species within this genus

Refer to label for the formula.

Refer to table for Average Water Depth (1-10 ft) with corresponding rates (Fl oz (Qt) of per Surface Acre at Specified Depth)