The Harrison County landscape includes both hills and valleys. Farming techniques differ depending on the topography of the farm because what works in the valleys does not work in the hills and vice versa. Tillage is not used in the Loess Hills but it is in the bottoms.As seen in 2019, flooding on the Missouri River bottoms is a significant challenge that affects management. Deposition of sand affects how locals farm, and weed seeds are spread during flooding as well. The high water table affects other aspects of management.
The Harrison County Pest Resistance Project initially began in 2017 as a result of the introduction of Palmer amaranth in the county four years prior. As most farmers in the area are grappling with herbicide resistant weeds but do not have Palmer in their fields yet, the project was expanded to include waterhemp, marestail, giant ragweed and disease trials as well. Read below to learn more about local disease and weeds and why they were included in this project.
The Story County Farm Resistance Network formed in 2019 in response to weeds that are becoming more difficult to control. The group shares common goals: to preserve the effectiveness of management tools and to encourage others to help. So far, the team members include farmers, COOP advisers, ag retailer reps and ISU Extension. A video has been created to introduce the team (below).
Outreach for Harrison County includes field days, presentations a local events, videos and news articles. Handouts have been distributed at local retailers and county events (Harrison County crop fair, Private Pesticide Applicator Training, Denison/Atlantic Crop Advantage Series). The project has been mentioned or promoted at the local crop fair, local extension events, and the county extension board meetings.
Materials to Share
The Harrison County Pest Resistance Management Project team will hold a field day Wednesday, July 7. The event, from 10:00 a.m. to 1:00 p.m., will include both herbicide and fungicide trials in soybeans at a farm southwest of Logan, operated by Larry Buss. This event is free and open to the public.
Palmer amaranth has the potential to become a weed pest that threatens farm productivity and profit. Weed Scientist Bob Hartzler visits three places in Iowa where Palmer has been found. Harrison County and the local Herbicide Resistance Project team is the only one successfully mitigating the threat.