The Earfull September 7, 2026
What is This Crop Telling Us?
The combine gives us the final yield number. A walk through the field before harvest helps explain why. This is the time to look for premature plant death, weak stalks, diseased roots, and the field patterns behind them.
Corn: Ghosted Plants and Dead Tops
Scattered corn plants that look gray-green, brown, or finished well ahead of their neighbors are often called “ghosted” plants. They may point to crown rot, stalk rot, or both. Do not diagnose them from the road—dig plants, keep the root ball intact, and split the lower stalk through the crown.
A rotted, brown-to-black crown; discolored roots; deteriorated pith; or weak lower internodes all point to a standability concern. These issues often start much earlier than when symptoms appear. Cool or wet soils, slow emergence, compaction, restricted roots, nutrient stress, saturated areas, and late grain-fill demand can all leave plants more vulnerable.
Also look up in the canopy. Scattered plants with a dead flag leaf and browned leaves or stalk above the ear may have anthracnose top dieback. It can resemble ghosting because the plant is dying early, but the top-down pattern is the clue. The upper portion of the plant dies while leaves around the ear or lower in the canopy may remain green.
Peel back upper leaf sheaths on suspect plants. Shiny black, elongated lesions on the stalk rind support an anthracnose diagnosis. Check the lower stalk, too. Top dieback often occurs with stalk rot, and a dead top alone does not tell you whether the plant will lodge.
Not every brown plant or dead top is disease. Heat and drought can kill upper leaves, often across a larger dry area of the field. Insect injury and other stresses can look similar. Compare affected plants with healthy neighbors, split stalks, and send samples for diagnosis if the cause is uncertain.
Let standability set harvest order
There is no late-season rescue treatment. The immediate priority is to identify fields most likely to lodge and put them ahead of stronger fields in the harvest plan. Begin near black layer and walk each field. At five or more stops, use both a pinch test on the lower internodes and a push test: push plants about 30 degrees from vertical and see whether they return upright.
A field with roughly 10% failed plants deserves attention and should be scheduled early. At 10–15% failed plants—or where crown rot, shredded pith, weak lower nodes, or lodging is concentrated in meaningful acres—move that field to the front of the line. Do not let a field with compromised stalks wait for the calendar just because grain is drying down well. Wind, rain, and continuing stalk decline can turn a manageable problem into ears on the ground.
When a high-risk field reaches physiological maturity, it can be worth taking it at approximately 20–25% grain moisture and drying it rather than waiting for ideal field-drydown moisture. The drying bill has to be weighed against lost ears, slower harvest, extra header loss, and the time required to pick up lodged corn.
If a weak field is already below 20% moisture, the margin for waiting is usually gone. Grain is not gaining meaningful drydown value fast enough to justify increased lodging exposure, and dry, weakened stalks can continue to fail. Harvest it as soon as logistics allow. Keep ground speed down in lodged spots, run the header close to the ground, and consider harvesting against the direction plants are leaning to reduce missed ears.
Record the hybrid, field location, soil conditions, drainage, population, fertility concerns, and severity while symptoms are still visible. Those observations help make better placement and management decisions next season.
Soybeans: SDS or Red Crown Rot?
Soybean plants with yellowing and browning between leaf veins are worth digging now. Sudden death syndrome and red crown rot can look similar from above the canopy, but the roots and lower stem help separate them.
Sudden death syndrome typically causes yellow areas between green veins that become brown and dead. As symptoms worsen, leaflets often drop while the petioles remain attached to the stem. Roots can be decayed, and blue fungal growth may sometimes be visible. Disease risk is often greater in fields with cool, wet planting conditions, compaction, poor drainage, or soybean cyst nematode pressure.
Red crown rot can cause similar interveinal yellowing and browning, but it more directly affects the roots and crown. Dig whole plants and inspect the lower stem at the soil line. Reddish discoloration at the stem base, severe root rot, and small reddish-brown fungal structures under favorable conditions are important clues. Unlike sudden death syndrome, plants affected by red crown rot often retain dead leaves.
Neither disease has an in-season cure. Flag affected areas and confirm red crown rot with a diagnostic lab, especially where it is new or suspected. For next year, use field observations to guide variety selection, soybean cyst nematode sampling and management, drainage and compaction improvements, and seed-treatment decisions. Crop rotation and avoiding movement of soil from suspect areas can help reduce red crown rot risk, but neither practice will erase a field history overnight.
Take Home
Every field tells a story. A few shovel digs, split stalks, standability checks, and notes before harvest can turn late-season symptoms into a better plan for hybrid placement, harvest timing, and disease management next year.
References
- Freije, A., Wise, K., & Nielsen, R. (2016). Diseases of corn: Stalk rots (BP-89-W). Purdue Extension. https://www.extension.purdue.edu/extmedia/BP/BP-89-W.pdf
- Adee, E., & O’Mara, J. (2026). Sudden death syndrome in soybeans: Symptoms, diagnosis, and management. K-State Research and Extension.
https://www.agronomy.k-state.edu/eupdates/2026/issue-1118-august-27/sudden-death-syndrome-in-soybeans.html - Camiletti, B. (2025). Red crown rot progressing in Illinois: Symptoms confirmed in Shelby County commercial fields. University of Illinois Department of Crop Sciences.
https://farmdoc.illinois.edu/field-crop-production/red-crown-rot-progressing-in-illinois-symptoms-confirmed-in-shelby-county-commercial-fields.html
The Earfull August 31, 2026
As Harvest Nears
As we move into September, drought is becoming one of the biggest variables separating fields across the Renk Seed area. The map does not tell the entire story—and neither does a drive down the road. Some acres caught timely rain and still have strong finish potential. Others have been running short of water for weeks, and they are showing it in earlier drydown, lighter grain fill, shorter plants, weak pod fill, or uneven maturity.
The latest U.S. Drought Monitor puts the sharpest late-season concern across parts of Minnesota, western and northern Wisconsin, and Michigan’s Upper Peninsula. Severe drought (D3) expanded across northwestern Wisconsin and into eastern Minnesota during the August 25 assessment. The same update noted some relief from showers in Michigan and southern Wisconsin, while another dry week aggravated ongoing impacts farther north and west.
That pattern lines up with what makes drought difficult to manage across the Renk Seed area: there is no single “Renk crop condition.” From Michigan into Wisconsin, Minnesota, the Dakotas, western Iowa, and
non-irrigated Nebraska, rainfall has been highly variable. Two fields only a few miles apart can be headed into harvest with very different yield, moisture, feed-value, and plant-health stories.
https://droughtmonitor.unl.edu/CurrentMap/StateDroughtMonitor.aspx
Corn: Grain Fill Is Still the Question
Corn is far enough along that the yield ceiling has largely been set, but late-season stress can still affect what makes it into the bin. Corn plants that ran short of water during grain fill may finish faster, show premature firing, lose stalk integrity, and end up with lighter kernels. The crop may look like it is “drying
down nicely,” when the reality is it’s finishing early because it ran out of water.
That is why field-by-field scouting matters right now. Pull ears from the good, average, and stressed areas
of each field. Look beyond kernel number and evaluate kernel depth, tip fill, ear consistency, plant health,
and stalk condition. Compare those observations to soil type, planting date, hybrid placement, rainfall timing, and any compaction or drainage pattern. The result is a much more useful harvest conversation than a whole-field estimate made from the road.
Late-season drought also raises the importance of stalk quality. A stressed plant may remobilize carbohydrates from the stalk to finish the ear. Add leaf disease, nutrient stress, root restriction, or insect feeding, and the risk of stalk cannibalization and lodging can increase. Prioritize fields with weak lower stalks, heavy ear load, visible firing, or early plant death for harvest rather than leaving them until last.
For irrigated acres, the decision is not simply whether the season has been dry. It is whether enough usable water remains in the root zone to finish the crop. Corn at beginning dent can still use about 2 inches of water through maturity, while corn at half milk line has about 0.8 inch remaining. The best final-irrigation decision combines growth stage, actual root-zone moisture, and the near-term forecast—not the calendar alone.
Corn Silage: Moisture Moves Fast in Stress Fields
Drought-stressed silage corn can move from “not ready” to “too dry” quickly. Whole-plant moisture must drive harvest timing; calendar date, kernel milk line, and field appearance are useful clues, but they are not a substitute for sampling. In a variable field, pull representative plants from multiple zones. Sandy ridges, shallow soils, compacted headlands, and the best portions of the field may not be at the same moisture.
Dry silage is harder to pack and is more vulnerable to heating and spoilage. Lower biomass also changes the feed-inventory conversation, especially on dairy and livestock operations that were counting on a normal-tonnage crop. If plants are drought-stressed, evaluate both quantity and quality before finalizing chop plans. Shorter cut length, careful kernel processing, aggressive packing, prompt covering, and a realistic inventory estimate become even more important when the crop is dry and variable.
Soybeans: Pod Fill and Plant Health Still Matter
Soybeans generally have more flexibility to recover from stress than corn—until moisture is short during pod and seed fill. The University of Minnesota notes that soybeans at beginning seed (R5) may use about 2.9 inches of water through maturity, compared with about 1.2 inches at full seed (R6). A timely rain can still add seed size and help retain yield; continued stress can mean small seed, aborted pods, uneven maturity, and a field that is ready sooner than expected.
Walk soybean fields with two questions in mind: Is this drought, or is drought exposing another problem? Dry conditions can make potassium deficiency, compaction, shallow rooting, soybean cyst nematode, sudden death syndrome, white mold history, herbicide injury, and poor drainage patterns easier to see. Symptoms that line up in zones or patches deserve a closer look before the combine erases the evidence.
This is also a good time to watch for green stem, uneven maturity, lodging, and late-season disease. In North Dakota, soybean condition is declining in much of the region under drought, along with reports of late-season potassium deficiency. Drought can reduce potassium movement to roots and make deficiency symptoms more apparent even in fields that are not extremely low in soil-test K. There may be no practical rescue treatment now, but these fields should be flagged for fall soil sampling, yield-map review, and next season’s fertility plan.
What Does It Mean?
This is not a year to make broad conclusions from one yield monitor map or one field visit. Drought response is a combination of rainfall timing, soil water-holding capacity, rooting depth, crop stage, hybrid or variety placement, fertility, and field history. The fields that look best today are not always simply the ones that received the most rain; they are often the fields that captured and held water, established roots early, and had fewer secondary limitations.
As harvest starts, the most valuable work may be documenting the story behind performance. Note the fields that held green longer, filled grain better, retained pods, maintained stalk strength, or stayed more consistent across soil zones. Just as important, document the fields that fell apart early. Was it light soil? Compaction? A planting-date issue? Fertility? Disease? A hybrid-by-field mismatch? Rainfall timing? Those notes turn this year’s drought into better product placement, better agronomy conversations, and better decisions for 2027.
Heading Into Harvest: What We’re Watching
- Scout before scheduling. Check stalk strength, ear retention, kernel depth, plant death, pod fill,
and maturity differences. Prioritize fields with lodging risk or fast dry-down. - Sample silage often. Use whole-plant moisture from representative areas—not just one grab sample
or milk line—to time chopping. Stress fields can vary greatly and dry rapidly. - Know the feed story. Estimate silage tonnage conservatively, manage packing and storage carefully,
and test drought-stressed feed for nitrate risk before feeding. - Separate drought from other causes. Flag patterns that match soil type, compaction, drainage, fertility, disease, or traffic. Harvest maps are much more valuable when they are paired with field notes.
- Watch soybean finish closely. Fields at R5-R6 can still respond to moisture, but drought may speed maturity and reduce seed size. Be ready for uneven dry-down and harvest timing.
- Use harvest to build next year’s plan. Pull post-harvest soil samples where conditions allow, especially for residual nitrogen and in fields with drought-related variability. Compare yield maps with drought zones and scouting notes before finalizing product placement.
A drought year has a way of exposing the limits in every field—but it also provides some of the clearest information we get. The goal now is not to explain every acre before the combine rolls. It is to capture
the observations that will help make the next crop more resilient.
References
- U.S. Drought Monitor. “Midwest Drought.” Data valid August 25, 2026.
- University of Minnesota Extension. “Do I need to irrigate again? Late-season irrigation considerations.” August 24, 2026.
- North Dakota State University Extension. Crop & Pest Report. August 27, 2026.
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