What do the colors of the markers on the map mean, and why are they different colors?
The markers on the map change color according to the risk level for that location. Markers can be green (low risk), yellow (medium risk), orange (high risk), purple (equivalent to pink; late blight seen within 2-5 miles) or red (late blight seen within 1 mile). For more information on how and when the colors change see the Explanations page.