Where does northern corn leaf blight typically overwinter?

Northern corn leaf blight, caused by the fungus Exserohilum turcicum, typically overwinters in plant debris. After harvesting, the infected leaves and plant residues left in the field can harbor the fungus, providing a source of inoculum for subsequent growing seasons. This is significant because when conditions become favorable—namely warm, humid weather—spores can be released from the debris and infect new corn plants.

While live plants and soil may play roles in the ecology of some pathogens, northern corn leaf blight specifically relies on the remnants of previously infected plants for its survival during dormant periods. Water bodies do not serve as a reservoir for this particular disease, as the fungus does not live in aquatic environments. Understanding the overwintering methods of plant pathogens is crucial for implementing effective management strategies in agricultural practices.