07/21/2026
DISEASE: Disease pressure continues to build across the territory, with gray leaf spot (GLS) and Tar Spot remaining the primary concern. Current risk levels are low to moderate, and the ongoing hot weather is expected to favor further GLS development, with much of the territory now at moderate risk.
DISEASE RISK MAPS: The image shows the Granular Insights fungicide disease-risk model (updated weekly on Wednesdays – you can view this as well!). Risk levels are based on the average planting date within each county.
FUNGICIDE TIMING: The broadly recommended application window is tassel through brown silk. There is a period of ~2.5–3 weeks between tasseling and brown silk. Earlier applications provide better protection against initial disease infection, while later applications extend protection deeper into the grain-fill period. Timing within this window can be challenging, the Fungicide Timing tool can help us hit the right timing to optimize the application and improve ROI.
FUNGICIDE APPLICATION CONSIDERATIONS:
1. Spray timing in hot weather: If possible, try avoid applications during the hottest part of the day (85–90°F+). If spraying in the morning, wait until heavy dew has dried.
2. Crop stage & adjuvants: Prior to and during tasseling, avoid adjuvants - especially containing NIS or COC.
3. Rainfastness: Hot weather often brings pop-up storms. Most fungicides require 1–4 hours to become rainfast; always check the product label.
