Under the authority of §24(c) of FIFRA (Federal Insecticide, Fungicide, and Rodenticide Act), states may register an additional use of a federally registered pesticide product, or a new end-use product to meet special local needs.
EPA reviews these registrations and may disapprove the state registration if, among other things, the use is not covered by necessary tolerances, or the use has been previously denied, disapproved, suspended or canceled by the Administrator, or voluntarily canceled subsequent to a notice concerning health or environmental concerns.
- An application for an SLN must come from the EPA registrant.
- Any SLN use must fit within an existing tolerance.
- A Colorado SLN label can only be used in Colorado.
- Approved SLN labels are set to expire after five years. The SLN can be extended if the five-year review concludes that the special local need still exists.
- CDA confers with CSU specialists in determining if an adequate special local need exists and whether the user will fit within an existing tolerance.
- If a Special Local Need Registrations adds a use to a product already registered with CDA, it does not require a separate Colorado pesticide registration. None of Colorado's current SLN's have a separate state registration.
If you are a registrant that is considering applying for an SLN in Colorado, please consult the SLN guidance document, at the link below.
Special Local Needs (SLN) Pesticide List for Colorado
The Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Section 24(c) allows States to register additional uses of a federally registered pesticide.
These additional uses are for distribution and use within a particular state to meet a "special local need" (SLN).
An applicator must have the 24(c) Supplemental Label in their possession to apply SLN products.
The following list is for Colorado only. Click on the label name below to open a PDF file of the SLN label.
| Product Brand Name | EPA Reg# | Registrant Name | Date issued | SLN# | Authorized Use | Site |
| Agri-Mek SC Miticide/Insecticide | 100-1351 | Syngenta Crop Protection, LLC | 5/22/2019 | CO-190001 | For control of spider mites (including banks grass mites). | Grasses grown for seed |
| Authority MTZ DF Herbicide | 279-3340 | FMC Corporation | 3/7/2014 | CO-140001 | For control of Kochia, Russian thistle, and lambs quarters on fallow land. | Fallow |
| Balance Flexx | 264-1067 | Bayer CropScience LP | 2/17/09 | CO-090001 |
For Control of Broadleaf Weeds and Grasses in Field Corn.
|
Corn |
| Beacon Herbicide | 100-705 | Syngenta | 11/9/2005 | CO-05-0004 | Kentucky bluegrass grown for sod production | Bluegrass sod |
| Brigade 2EC | 279-3313 | FMC Corporation | 4/3/2017 | CO-170003 | Mite and Aphid control | Kentucky Bluegrass, seed production |
| Brigade 2EC | 279-3313 | FMC Corporation | 5/15/09 | CO-090003 | Insect control in alfalfa grown for seed | Alfalfa |
| Carzol SP | 10163-265 | Gowan Company | 8/8/2006 | CO-060008 | Insect control in alfalfa grown for seed | Alfalfa, seed prod |
| Comite II | 400-154 | Chemtura | 5/7/2008 | CO-080002 | Mite control in alfalfa grown for seed | Alfalfa, seed prod |
| 264-1066 | Bayer CropScience LP | 3/27/09 | CO-090002 | Additional soil restrictions for isoxaflutole | Corn | |
| 264-1066 | Bayer CropScience LP | 1/14/2015 | CO-150002 | Fallow land, Kochia control | fallow | |
| 67702-2-70051 | Certis USA | 1/29/2020 | CO-200001 | Disease control in hemp | Hemp | |
| Dibrom 8 Emulsive | 5481-479 | Amvac Chemical Corporation | 7/7/1999 | CO-990011 | To control lygus in seed alfalfa | Alfalfa, seed prod |
| Dimethoate 400 | 34704-207 | Loveland Products, Inc. | 7/12/2017 | CO-170004 | Aphids, banks grass mites, spider mites | Grasses, seed production |
| Dimethoate 400 EC | 34704-207-279 | FMC Corp. | 8/2/2017 | CO-170004 | Aphids, banks grass mites, spider mites | Grasses, seed production |
| Dual Magnum | 100-816 | Syngenta | 3/10/1999 | CO-990002 | For control of weeds in dry bulb onions | Onion |
| Dual Magnum Herbicide | 100-816 | Syngenta | 4/1/2003 | CO-03-0008 | Spinach, weed control | Spinach |
| Gramoxone SL 3.0 | 100-1652 | Syngenta Crop Protection, LLC | 8/30/2021 | CO-210001 | Preharvest Dessication | Alfalfa, Seed Prod |
| Intrepid 2F | 62719-442 | Dow Agrosciences | 8/3/12 | CO-120002 | Aerial application on dry beans and sugarbeets at reduced gallonage (5 gap) | Beans, dry edible, sugarbeets |
| Lorsban Advanced | 62719-591 | Dow Agrosciences | 06/28/2010 | CO-100004 | Control of Aphids, 7-day PHI / lower rates | Sweet Corn |
| Natular G30 | 8329-83 | Clarke Mosquito Control Products, Inc. | 02/08/2018 | CO-180003 | Applied in mesh bags, Animas Mosquito Control District Only | Non-crop. standing water, mosquito larvae habitat |
| Onager | 10163-277 | Gowan Company | 2/9/2016 | CO-160001 | Banks grass mite, two-spotted spider mite. | Grass grown for seed |
| Onager Miticide | 10163-277 | Gowan Company | 10/31/08 | CO-080007 | To control spider mites in alfalfa and clover grown for seed | Alfalfa, clover grown for seed |
| Prowl H20 herbicide | 241-418 | BASF | 1/24/2006 | CO-060002 | Weed control in dry bulb onion delayed preemergence | Onion |
| Reflex Herbicide | 100-993 | Syngenta | 12/31/2019 | CO-100003 | Weed control in dry beans | Beans |
| Scoparia Herbicide | 264-600 | Bayer CropScience LP | 1/9/2015 | CO-150001 | Fallow land, Kochia control | fallow |
| Status Herbicide | 7969-242 | BASF | 4/3/2007 | CO-070002 | Corn-allows aerial applications | Corn |
| Tilt | 100-617 | Syngenta Crop Protection | 04/11/2016 | CO-160003 | Disease control in grass grown for seed | grasses, seed production |
| Vydate L Insecticide/Nematicide | 352-372 | DuPont Agricultural Products | 7/11/2001 | CO-010005 | To suppress onion thrips and western flower thrips on bulb onions in Colorado. | Onion |
| Zinc Phosphide on Wheat | 56228-3 | U.S. Department of Agriculture | 4/13/2022 | CO-220001 | For control of Wyoming ground squirrels. For use only by USDA APHIS employees | alfalfa, mixed grass/alfalfa fields, pastures, rangeland, and airports |