Crop Watch 2025: Corn Yield Threats
Several threats are impacting corn yields this season, including overly tight tassel wrap, Southern Rust and tar spot.
Unscripted: ‘Overly Tight Tassel Wrap’ Affecting Pollination?
Ken Ferrie, Farm Journal field agronomist, joins Tyne Morgan and Clinton Griffiths to shed light on crop conditions, particularly pollination issues.
Crop Condition News
A prematurely collapsing ear shank stops grain fill, leading to yield reductions that can reach as high as 40%.
The Midwest crop is being pushed into black layer (R6) prematurely in some areas in ways that are easy to confuse with normal drydown factors.
The disease is causing turmoil for farmers who have a large crop in the making. In some cases, a Hail Mary fungicide application at R4 up to early dent (R5) might make sense this season, say agronomists.
On the heels of Crop Tour, Pro Farmer projects corn yields at 6.1 bu. below USDA’s August estimate, while soybean yield numbers are nearly aligned.
The Minnesota corn crop is going for gold. Pro Farmer Crop Tour scouts expect the crop will reach a record 202.86 bu. average, if it can outpace southern rust and tar spot. Scouts peg the Iowa corn crop at a 198.43 bu. average, but it also faces disease challenges.
Iowa could be the nation’s top state this year for corn and soybeans, but both crops are in a race to beat disease pressure that’s gaining momentum. Illinois corn continues to ride the struggle bus, while the soybean crop there is positioned to deliver high yields.
There is still up to 55% of the kernel dry weight left to be accumulated by many corn hybrids at this point — starch that can contribute significantly to grain fill and higher test weights.
While some scouts saw a big corn crop in the making in South Dakota, yield and pod counts came in below Pro Farmer Crop Tour numbers from 2020. Results from the eastern route peg corn at 185.69 bu. per acre, beating the tour record of 185 bu. set in 2021.
Elevated levels of the disease are trending currently, and are of ‘serious concern’ over the next eight weeks, say researchers.
With at least four weeks left in the growing season, Ferrie encourages farmers to stay ahead of heavy disease pressure in fields, particularly in what he calls D hybrids — those that punch their yield card late-season.