Medusahead is very competitive and will crowd out even other undesirable species. Distribution - BLM Prineville Dist. Presently found in all counties. Common along the Deschutes River around Maupin and the John Day River near Clarno. Heavily infested rangelands have suffered as much as 40 to 75 percent reductions in grazing capacities.
Control is difficult, only one of the currently approved chemicals is usable.
Glyphosate has excellent results in effective control when paired with competitive seeding. No known or approved biological control agents. Preliminary results are good.