Area of impact: Tassel
Description: Top leaves become twisted with extreme tillering and the tassel turns into a leafy-looking mass. Severely infected plants may have narrow leathery or shortened leaves with pale stripes.
Pathogen involved: Sclerophthora macrospora (an oomycete)
Timing/Conditions: Infection starts when the whorl emerges and develops most often between the seedling and 4 to 5 leaf stage in corn that has been flooded for 24 to 48 hours.
Contributing factors: Flooding increases risk. Occur when soil and water get trapped in the whorl.
Management practices: Improve drainage and avoid planting in low wet areas.