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.
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 Herbicide Resistance Project features side-by-side comparison of 10 herbicide programs in both corn and soybeans. Join us from 9:30am to 11:00am for a field walk at the corn plot (address coming soon) to gauge success and implications for future resistance management. This event is free and open to the public, and coffee and donuts will be provided.
The Harrison County Pest Resistance Project will hold a field day Tuesday, July 9th. Join us from 10:00 am to 1:00 pm to observe field trials, which include both herbicide and fungicide trials, at the farm operated by Larry Buss southwest of Logan. This event is free and open to the public.
Harrison County was the site of three recent events highlighting local efforts addressing herbicide resistance.
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.