Semera SC Herbicide

4 out of 5 stars 4 Reviews | 0 Q&A

Semera SC Herbicide
Semera SC Herbicide
Semera SC Herbicide
Semera SC Herbicide
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Average Rating

4 out of 5 stars Rating: 4

4 Reviews | 0 Q&A

Product Overview

Semera 4 SC Herbicide is an economic fast-acting herbicide that offers pre-emergence and post-emergence control on broadleaf weeds and grasses. It destroys a wide range of weeds such as Russian thistle, kochia, carpetweed, bluegrass, and pigweed. Also effective on submersed, emergent, and floating aquatic weeds. Its unique mode of action enters the targeted weeds thru foliage, disrupts chlorophyll, and makes weeds decompose rapidly. Flexible for both aerial and ground application. Compatible with a variety of post-emergent herbicides for more control. Best used on non-crop areas, conifers, reforestation sites, containers, trees, landscapes, ornamentals, and slow-moving waters. Available in an eight-ounce bottle.

Features and Specs

Active Ingredient 41.4% Flumioxazin
Target pests Grasses and broadleaf weeds
For use in Non-crop areas, conifers, reforestation sites, containers, trees, landscapes, ornamentals, and slow-moving waters
Application For post-emergence application, apply this product to actively-growing weeds. Best applied in combination with a surfactant to weeds less than 2 inches in height. See label for more instructions.
Pet safe Yes, if used as instructed.
CT, NY (Restricted To Licensed Applicators Only)
Dimensions 2.00 x 4.00 x 6.00
Shipping Weight 0.70 lbs
Manufacturer Atticus LLC (Mfg. Number: 520235)
EPA Registration 91234-204



If not used in accordance with directions on the label, this product is toxic to non-target plants and aquatic invertebrates . For terrestrial uses: DO NOT apply directly to water, to areas where surface water is present or to intertidal areas below the mean high water mark .DO NOT apply directly to treated, finished drinking water reservoirs or drinking water receptacles when water is intended for human consumption . Drift and runoff may be hazardous to non-target plants and aquatic organisms in water adjacent to treated areas .DO NOT apply where runoff is likely to occur .DO NOT apply when weather conditions favor drift from treated areas .DO NOT contaminate water when disposing of equipment washwaters or rinsate.

This pesticide is toxic to plants . Use strictly in accordance with the drift and run-off precautions on this label in order to minimize off-site exposures .Treatment of aquatic weeds can result in oxygen loss from decomposition of dead weeds . This loss can cause fish suffocation . Therefore, to minimize this hazard, treat 1/3 to 1/2 of the water area in a single operation and wait at least 10 to 14 days between treatments . Begin treatment along the shore and proceed outwards in bands to allow fish to move into untreated areas. Consult with the State agency with primary responsibility for regulating pesticides before applying to public waters to determine if a permit is needed.

DO NOT discharge effluent containing this product into lakes, streams, ponds, estuaries, oceans, or other waters unless in accordance with the requirements of a National Pollutant Discharge Elimination System (NPDES) permit and the permitting authority has been notified in writing prior to discharge .DO NOT discharge effluent containing this product to sewer systems without previously notifying the local sewage treatment plant authority .For guidance contact your State Water Board or Regional Office of the EPA.


Use this product only in accordance with its labeling and with the Worker Protection Standard (WPS), 40 CFR part 170 . This standard contains requirements for the protection of agricultural workers on farms,forests,nurseries,and greenhouses and handlers of agricultural pesticides. It contains requirements for training, decontamination, notification, and emergency assistance . It also contains specific instructions and exceptions pertaining to the statements on this label about personal protective equipment(PPE)and restricted-entry interval (REI). The requirements in this box only apply to users of this product that are covered by the Worker Protection Standard .DO NOT enter or allow worker entry into treated areas during the restricted-entry interval (REI) of 12 hours.

PPE required for early entry to treated areas that is permitted under the Worker Protection Standard and that involves contact with anything that has been treated, including plants, soil or water is: coveralls, chemical-resistant gloves made of water-proof material, shoes plus socks.


The requirements in this box apply to uses of this product that are not within the scope of the Worker Protection Standard (WPS) for agricultural pesticides (40 CFR Part 170) . The WPS applies when this product is used to produce agricultural crops on farms, forests, nurseries, or greenhouses .Keep all unprotected persons out of operating areas, or vicinity where there may be drift .DO NOT enter or allow others to enter the treated area until sprays have dried.


DO NOT contaminate water, food or feed by storage or disposal. Store in a tightly closed container in a cool, dry place. Store in original container and out of reach of children, preferably in a locked storage area. Pesticide spray mixture or rinsate that cannot be used must be disposed of in a landfill approved for pesticides. Improper disposal of excess pesticide spray mixture or rinsate is a violation of Federal law . If these wastes cannot be disposed of by the use according to label instructions, contact your State Pesticide or Environmental Control Agency or the Hazardous Waste representative at the nearest EPA Regional Office for guidance. Nonrefillable Container. DO NOT reuse or refill this container. Triple rinse container (or equivalent)promptly after emptying.

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  • 1 of 5 Stars

    Not working on watermeal

    By Laurie on 07/07/2023

    Bought this because they claimed it kills watermeal. Still have it after multiple sprays.

    Expert ResponseExpert response:
    We apologize you did not get the expected results. Here is a bit more information that will help you have a successful application for watermeal. Semera SC is a contact herbicide that quickly degrades in the water column so plants that DO NOT initially come in contact with the herbicide will not be controlled. Coverage is essential for effective watermeal control. All floating weeds need to be exposed to lethal concentrations in all parts of the water body. Any watermeal escapes left in the water column will quickly re-infest the water body. Any untreated escapes or re-introductions of plants that were not treated will reestablish in areas where surface weeds have been previously controlled. Semera SC must be applied across the entire water body surface where the watermeal is present. If not, control will be limited and the watermeal will quickly repopulate the water body. We hope this information is helpful to you. Please let us know if you have any additional questions. We are always happy to help.

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    0 of 1 people found this review helpful

  • 5 of 5 Stars

    Watermeal termination

    By Houston on 08/24/2023

    I purchased the semera sc, to kill the watermeal in my pond. Waited until the wind pushed it all to one end. I mixed 2.5 oz to 30 gallons of water added about a cup of surfactant. Sprayed it thoroughly and also sprayed the entire shore line. In about 10 days 99 percent of the watermeal was gone. The pond was completely covered. I had tried 2 different herbicides prior with no results. 10 days later still looks great. Glad to have my pond back. Thanks Houston

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  • 5 of 5 Stars

    Watermeal termination

    By Houston on 08/26/2023

    I had watermeal covering my entire pond. I previously tried two other products with no success. I waited until the wind blew it all to one end. I mixed 2.5 oz. to 30 gallons of water. Thoroughly sprayed it, then sprayed the entire shoreline. About 10 days later about 99 percent gone. Still looks great 20 days after. I don't remember if I got the Semera sc from ya'll or not. But am extremely satisfied with the product. Thanks Houston

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  • 5 of 5 Stars

    Works well

    By Alex on 06/25/2024

    Verified Purchase

    I applied Semera in pine straw areas around my yard. It knocked down some existing weeds and has shown good residual control. My pine straw areas have been staying very clean. I'm happy with the results.

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Semera SC Herbicide 4 out of 5 stars Rating: 4 (4 Reviews / 0 Q&A)

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