NDSU Potato Blightline for June 10, 2014
No late blight severity values have accumulated so far this season. The risk of late blight now is low, but continuing wet weather during the season will provide conditions favorable for late blight. Preventing first sources of late blight is a critical part of late blight management. These sources of initial inoculum are culls, volunteers and seed. Infected seed can be an early source of late blight inoculum, so it is important to scout fields for late blight early and all season.
Blightline June 10, 2014 (pdf)