Warm and humid conditions increase the likelihood of foliar diseases affecting corn crops, particularly in fields with susceptible hybrids or continuous corn systems. While disease levels remain low in Kentucky, growers should remain vigilant as diseases like southern rust and tar spot could emerge later in the season. Untreated diseases can lead to yield losses, especially if environmental conditions become more favorable for disease spread. However, hybrids with strong resistance to foliar diseases may not benefit economically from fungicide applications.