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Central Iowa Crop Update
Updates from an agronomist and weed nerd in central Iowa.
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In this issue:
- Herbicide Field Days coming up!
- Cooperators needed for Corn Rootworm Adult Monitoring Network!
- How's the weather treating us now?
- POST herbicide application thoughts in soybean
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Herbicide Field Days coming up!
My colleague Angie Rieck-Hinz and I are hosting two herbicide resistance management field days coming up in June. Note that the McCallsburg location will be corn plots and the Kanawha location is soybean plots.
June 15 - McCallsburg Herbicide Resistance Management Field Day from 1-3 p.m. This field day will lead you through corn herbicide plots to talk about using effective modes of actions, effective rates and appropriate timing strategies. This site is known to have HPPD resistance. Did you know that ISU research has shown that a change in corn herbicide programs could result in a 75% reduction in waterhemp emergence in soybean? This field day will be held 1 mile south of McCallsburg on S27. Please follow the signs for parking. This event is free and open to all. If you have questions, please contact the Story County Extension Office at 515-337-1601.
June 29 - Hold the date for a Herbicide Resistance Management Field Day at the south farm of the Northern Research Farm from 1-3 p.m.! This field day is the sister event to the June 15 field day listed above. We will tour soybean herbicide plots to talk about using effective modes of actions, effective rates and appropriate timing strategies. We will also look at impacts of cover crops on weed pressure. More details to come, but for now let's hope for some rain so those pre-emerge herbicides work!
July 8 - Hold this date for the ISU Weed Science Program Field Day! This will be a public field day with plot tours focused on corn and soybean herbicide programs, herbicide resistance screening updates, harvest weed seed control, cereal rye termination timing, and other research updates from the ISU Weed Science Program. Please call or email me at 319-331-0058 or mjanders@iastate.edu to register for the free lunch!
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Cooperators needed for Corn Rootworm Adult Monitoring Network!
We're looking for cooperators to place and monitor sticky traps for northern and western corn rootworms across the state this summer! If you're interested in joining the network, please email bugtraps@iastate.edu by June 15, 2021 to let our entomologists know you're interested! We use this monitoring network to get a sense for how populations of western and northern corn rootworms vary across the state and across different crop rotations. A particularly good place to monitor for these pests would be in fields with a history of corn rootworm problems or those with a history of continuous corn. Read more about the monitoring network here!
Additionally, this year, due to the high levels of volunteer corn present in soybean fields, corn rootworm may pose a greater risk to rotated corn fields in 2022. My colleague Rebecca Vittetoe and I would like to recruit some cooperators to trap in soybean fields with heavy volunteer corn pressure in order to monitor populations and evaluate whether corn rootworm will be a risk to rotated corn again in 2022 in these areas. Again, please reach out to bugtraps@iastate.edu by June 15 if you are interested in participating!
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