Dicamba Herbicide Updates
Dicamba containing herbicides have been in the news and under review by state and federal pesticide regulators since 2017, based on excessively high numbers of off-target movement (drift and volatilization) complaints.
This website is intended to provide interested parties with regulatory and other related information associated with dicamba herbicides in Indiana.
Dicamba Use in Indiana
Certain formulations of Dicamba are classified as restricted use pesticides (RUP). According to IC 15-16-4-37, any pesticide product containing dicamba concentrations greater than or equal to 6.5% and are labeled for agricultural uses. The RUP classification does not apply to products labeled solely for use on turf or nonagricultural (i.e. lawn and landscape) use sites.
Dicamba products that are classified as state RUPs also have a Highly Volatile Herbicide (HVH) Determination in the state of Indiana. According to IC 15-16-4-17, an HVH is a herbicide that the Indiana Pesticide Review Board (IPRB) has determined to be capable of emitting vapors that may cause serious injury to non-target plants through the movement of these vapors from the application site. Through the HVH determination, the IPRB established requirements to significantly reduce the incidence of off-target movement of dicamba to protect sensitive non-target plants.
On January 7, 2025, the IPRB voted to amend the HVH Determination. View the most current requirements here: Highly Volatile Herbicide (HVH) determination (pdf, 671kb).
Updates to the FAQs listed below (Dicamba Use in 2025 and Dicamba HVH FAQ) are in the works and will be provided soon.
- Dicamba Use in 2025 (pdf, 320kb)
- Dicamba Highly Volatile Herbicide (HVH) Frequently Asked Questions (04-22-24) (pdf, 312kb)
- Use of Existing Stocks of Dicamba Soybean Herbicides in 2024 (source: epa.gov)
- Indiana Restricted Use Pesticides (RUPs) List - March 2024 (pdf, 191kb)
- DriftWatch Sensitive Crop/Site Registry (source: DriftWatch)