Why and When to Use Foliar Fungicides in Corn: Protecting Plant Health for Higher Yields
Foliar fungicides play a key role in protecting corn yield potential by maintaining healthy leaf tissue throughout the growing season. When leaves stay healthy and green, the plant can continue photosynthesis at full capacity, which directly supports grain fill and overall yield. Disease-infected leaves, on the other hand, lose their ability to photosynthesize efficiently, leading to premature death and lower productivity. Using a foliar fungicide helps shield the plant from disease pressure during critical growth stages, especially when conditions favor fungal development.
Beyond disease control, foliar fungicides also impact plant physiology. They reduce the plant’s production of ethylene, a hormone that accelerates aging, allowing the plant to maintain green leaf tissue for a longer period. This results in better energy use, more efficient grain fill, and improved late-season standability. According to AgriGold, the ideal timing for applying a foliar fungicide is between the V6 and R1 stages, particularly when targeting Gray Leaf Spot, Southern Rust, and Northern Corn Leaf Blight. Applying at the right time can maximize protection and preserve your yield potential.