Indiana corn planting reached 76% as of May 24, matching both last year’s pace and the five-year average, according to a May 29 update from Purdue University Department of Agriculture. The compressed planting window this season meant that some fields are just emerging while others are nearly finished, with the earliest-planted fields at growth stages V4–V6. Fifty-four percent of Indiana’s planted corn had emerged by May 24, also consistent with last year and slightly ahead of the five-year average.
Jeferson Pimentel and Daniel Quinn reported that starting later than usual could affect yield potential because it compresses pollination and grain fill timing. “Starting this late does mean we were statistically already trading some yield potential from day one,” they said. They noted that uniformity within a field is critical for maximizing yields: “A three- to four-day spread in emergence within a field can meaningfully reduce yield potential.” They recommended scouting for stand uniformity, root development issues, early weed pressure, and soil conditions in late-planted fields.
Windy conditions have delayed spraying operations in some areas, allowing weed pressure to build as pre-emergence herbicides lose effectiveness. The report suggests considering post-emergence options where necessary: “Warm temperatures and moisture are exactly what weeds want right now, and they don’t wait for a calm wind day.”
Daniel Quinn highlighted common color differences observed in young corn plants across Indiana during early growth stages. Purple leaves can result from anthocyanin accumulation due to cool temperatures or genetics; yellow-green coloring may indicate poor root establishment or cool weather; rapid-growth syndrome causes tightly wrapped whorls with bright yellow leaves after temperature swings; striped upper leaves often point to nutrient deficiencies such as sulfur; silver leaf symptoms arise from radiational heat loss on clear nights; white or bleached leaves may be caused by environmental stress or herbicide exposure.
Evan Cohagan interviewed Pioneer Field Agronomist Carl Joern about seed treatments used during challenging seasons like 2026. Joern said: “It’s a mix of fungicides, insecticides, and biologicals… We also include Lumialza for corn nematodes and Lumidapt Valta LS… If the treatment isn’t on the seed when it hits the trench, you’re just wasting money.” He described advantages such as protecting seedlings during their most vulnerable period but cautioned that treatments are not foolproof against prolonged flooding.
Purdue University Department of Agriculture functions as a core academic unit within Purdue University and supports research projects through AgSEED grants while enhancing social well-being through extension efforts. Its agricultural and biological engineering graduate program ranks first nationally, according to the official website.
