This project examined controlling weeds using grazing by goats versus treatment with the herbicide milestone.
Treatments: 1) Control 2) Milestone 3) Graze once 4) Graze twice (See below)
Herbicide Results: Observation Date: 7/19/07
- Musk thistle: 90-95% control
- Russian and spotted knapweed - 90% control
- Dalmatian toadflax - 10% control (weeds only turned yellow)
First Grazing: Observation Date: 06/29/07
- Musk Thistle - 50% of rosettes/ bolted plants grazed
- Russian/Spotted Knapweeds - 90% grazed down to crowns
- Dalmatian Toadflax - little signs of grazing effect on plant
Second Grazing: Observation Date: 07/19/07
- Musk Thistle - 25% control, 50 - 75% bolted with seed heads formed. Remaining 25% grazed to rosette stage.
- Russian/Spotted Knapweed - 90% of plants grazed down to crowns, six - eight inches of regrowth occurred after grazing, no seed heads formed on regrowth.
- Dalmatian toadflax - 50% of stems were stripped of leaves, plants appeared to be stressed.
- Milestone herbicide is an effective weed control option for thistle and knapweed control.
- Grazing weed can be an effective weed control option; however, more than one year of grazing is required.
- Herding grazing goats is not as effective as penning grazing goats in electric fence pens to control weeds.
- Weeds need to be grazed at least twice during the growing season to reduce the seed source for the following year.
- Using a combination of grazing and herbicide treatments can be an effective weed control option especially in sensitive areas.
- Goats can prevent flowering of musk thistle using repeated grazing.
- Goats must graze knapweeds repeatedly (at least twice) during the growing season to prevent plants from producing seeds.