U.S. Department of Agriculture: Animal and Plant Health Inspection Service


Date of this Version

January 2001


Published in Proc. of the 23th Sunflower Research Workshop. January 17-18, 2001. Fargo, ND


In the fall, blackbirds form large flocks and roost overnight in cattail marshes. These blackbirds cause millions of dollars in damage to ripening sunflower fields in North Dakota, South Dakota, and Minnesota. By knowing the habitat characteristics around fall blackbird roosts sites, management officials may be able to predict future roost locations and then implement control techniques to help reduce blackbird damage to sunflower fields. We present data on the available habitat around blackbird roosts to determine if there is a relationship between the habitat and fall roost sites.