Division of Extension
Extension specialists and educators provide timely information on management of weeds, insects and disease in Wisconsin cropping systems.
Corn earworm (Helicoverpa zea) larvae feed on a variety of crops, mainly impacting sweet corn and hybrid dent seed corn. Larvae feed on the tips of corn ears, damaging kernels and contaminating the ears with frass.
In spots, too much water accumulated and led to drowned out spots and in some cases even entire fields. In spots, these areas were re-planted. In other areas, troublesome weeds like waterhemp are quickly escaping and will likely produce plenty of seed before a killing frost occurs.
As we pass the halfway point of the 2024 growing season, it’s important to remember that insect pests currently in fields may also affect 2025 crops. Many pests lay eggs that overwinter and can cause crop damage in the subsequent year. Corn rootworm is a key pest to watch.
Scouting is more important now than ever. Why? Well, a general rule of thumb is problems are best handled early. This applies to insect pests as the earlier you see an infestation, the easier it is to avoid economic damage. So, you might be wondering, what should I be watching for right now?
Western bean cutworm (Striacosta albicosta) is an economic pest in dry bean and corn production. Despite its name, western bean cutworm (WBCW) does not naturally feed on field soybeans. Larvae feed on corn ears, leading to yield loss and reduced grain quality.
The July 24 Badger Crop Connect webinar featured Dr. Shawn Conley, Extension Soybean and Small Grains Agronomist and Professor in the Department of Plant and Agroecosystem Sciences, University of Wisconsin–Madison. Shawn discusses preliminary results from 2024 Wisconsin winter wheat performance trials including yield, test weight and disease presence data; cover crop challenges in 2024; and the status of soybean stands across Wisconsin.
The July 24 Badger Crop Connect webinar featured Dr. Damon Smith, Extension field crops pathologist and Professor in the Department of Plant Pathology, University of Wisconsin–Madison. Damon gives an update on what diseases he’s seeing in Wisconsin farm fields in late July 2024. He mainly discusses white mold in soybean and tar spot in corn and management practices for each.
Japanese beetles (Popillia japonica) are an invasive beetle that feed on the leaves and flowers of crops, including corn and soybeans.
Damon Smith, UW–Madison Extension field crops pathologist, and Michael Geissinger, outreach specialist with UW-Madison Extension Nutrient & Pest Management in Northwest Wisconsin, talk about the conditions this year, what that means for tar spot development, and management considerations for controlling it if it shows up in your field.
Tools are available to help corn growers and dairy and livestock producers negotiate a fair price for corn silage.
True armyworm (Mythimna unipuncta) is a pest of corn and small grains known for migrating in large groups when its preferred food source is depleted. Pastures and grassy hay fields are also at risk of damage.
The May 22 Badger Crop Connect session features Dr. Damon Smith, Professor and Extension Specialist of Field Crops Pathology. Damon talks about the disease situation in field crops as the field season gets started.
