The Disease Triangle: Monitoring July Corn and Soybean Vulnerabilities

In this Cornelius Seed Podcast season update, lead agronomist Craig Allaman reviews mid-season crop conditions as corn moves through full tassel and early silking, with warm, humid weather and dews creating favorable disease conditions. He reports widespread low-canopy gray leaf spot and common rust, very light northern corn leaf blight, and some early tar spot, noting heat has kept cooler-weather diseases in check but gray leaf could continue to build and southern rust remains a major concern due to storms bringing spores north. The best fungicide timing is generally R1 (silking) through brown silk, but scouting should continue through mid- to late August for late outbreaks. Soybeans are improving as saturated areas recover and nodulation returns; he highlights red crown rot as an emerging, yield-robbing disease to watch for and stresses ongoing scouting across fields and trials. 00:00 Southern Rust Watch 00:22 Season Update Kickoff 00:55 Tasseling And Trial Checks 03:13 Corn Disease Snapshot 04:54 Southern Rust Risk Rising 06:16 Fungicide Timing Window 07:41 Soybeans Turning Around 08:41 Field Variability Tour 10:46 Red Crown Rot Alert 13:36 Biologicals And Rootworm Plans 15:08 Scout Hard Through August 16:18 Wrap Up And Thanks