Invasive weeds threaten the ecological integrity of aquatic environments in Montana. Eurasian watermilfoil, curly-leaf pondweed and flowering rush have become established in the state, and there is a high risk of invasion by other non-native aquatic plants.
These plants are highly competitive and affect fisheries, native plants, waterworks, power generation and irrigation. Increased aquatic plant biomass also impacts water quality and recreational resources.
Invasive aquatic plants are transported by hitching a ride on animals, watercraft and recreational vehicles, as well as scuba, fishing and hunting equipment.
Boating - Before launching & before leaving:
Hunting & Other Outdoor Activity
Click on the items below to download the complete guide or parts, meant to help with identification of Montana's freshwater aquatic plants.
State requirements regarding discharge permits have changed. Please visit the Montana Department of Environmental Quality website for information.
Application of aquatic herbicides in Montana requires a special-use license. The Montana Department of Agriculture oversees the licensing and training of aquatic pesticide applicators. Applicators who intend to treat waters with state restricted-use aquatic herbicides (xylene or acrolein) must attend a special aquatic training session and pass an Aquatic Pest Control Exam for initial certification. Training and testing is offered once a year by the Department.
The Department conducts aquatic herbicide applicator recertificaton training sessions periodically. These are listed with other applicator training opporunities on the Pesticide Training website.
For more information about pesticide licensing click here.
Weed Program Manager
Montana Department of Agriculture
302 N Roberts
Helena, MT 59601
Phone: (406) 444-3140
Fax: (406) 444-9493
Published: April 4, 2011 11:53:00 AM MDT.
Last Modified: June 14, 2016 8:49:34 AM MDT