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Keep an Eye out for Asian Copperleaf

September 28, 2023
Map of currently known Asian copperleaf infestations in Iowa, September 2023.

With yet another sighting of Asian copperleaf (Acalypha australis) this fall, it’s a good reminder to keep an eye out for this new species during harvest. Asian copperleaf (Acalypha australis) was first discovered in Iowa in 2016 in a corn field near Cedar Falls. Prior to this discovery, the only documented infestation in North America was within New York City. Since the initial discovery, it has been found in four other locations, totaling five counties across north central Iowa (Figure 1).

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Look before you leap: Cautions for delayed preemergence applications in soybean

May 7, 2023 9:48 PM
Blog Post

The beautiful weather this past week means we’ll see a substantial increase in planted acres on this week’s Crop Progress and Condition Report. Farmers should carefully evaluate their herbicide choices before spraying any planted soybean fields that didn’t get their preemergence (PRE) herbicide on ahead of the rain over the weekend. It is always important to read and follow the label – it’s the law after all.

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Keep an Eye Out For This Weed

October 5, 2022
Dense population of Asian copperleaf.

While Iowa weed communities change constantly, it is rare that a species new to the region is discovered. Asian copperleaf (Acalypha australis) was first discovered in Iowa in 2016 in a corn field near Cedar Falls. Prior to this discovery, the only documented infestation in North America was within New York City. The plant was recently found in a soybean field in Grundy County, nearly 30 miles from the original infestation (Figure 1).

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Fall Burndown Treatments for Winter Annual Weeds

September 30, 2022
Henbit seedlings under a corn canopy.

Recent rainfalls are likely to result in the establishment of winter annual weeds. Many fields may have dense stands of these weeds going into winter (Figure 1). It is often difficult to achieve timely burndown of these species in the spring, so farmers with persistent problems should consider making a fall burndown application to control winter annuals.

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Glyphosate math

April 4, 2022 2:27 PM
Blog Post

Determining the appropriate glyphosate rate is probably more important this spring than in previous years. Between high herbicide prices, reduced supply, and possibly using a different glyphosate product, it is worth checking to make sure you’re applying the optimum rate for efficient control.

Virtual crop scouting school now available from CPN

April 19, 2021 11:10 AM
Blog Post

The 2021 Virtual Crop Scout School is now available and is free to the general public. The scout school consists of 22 webinars from crop protection specialists at eleven Midwest Universities and is offered through the Crop Protection Network (CPN).

Crop Protection Network (CPN) Needs Your Input!

September 21, 2020 1:31 PM
Blog Post

Help the CPN determine how to serve you best through this short survey.

The Crop Protection Network (CPN) develops tools to help farmers, ag industry, and researchers with crop protection decisions. The CPN is a partnership of university Extension specialists providing unbiased, research-based information at no cost.

Scout Now for Palmer Amaranth

July 28, 2020
meaghan standing next to palmer plant

This is the time of year to begin scouting for Palmer amaranth (Amaranthus palmeri) in Iowa crop fields. While Palmer amaranth has been identified in more than half of Iowa’s counties, new identifications have waned since the widespread introductions in 2016. Palmer amaranth is still a species to watch out for in every Iowa crop field. Minnesota recently reported finding the weed in a county previously not known to have infestations – thus the weed is still on the move.

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