Published online by Cambridge University Press: 12 June 2017
Volunteer wheat and downy brome (Bromus tectorum L.) were consistently controlled by aerial applications of granular 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (atrazine) without supplemental tillage. Injury to winter wheat seeded in the fall 13 and 14 months after application of atrazine has occurred. Plots aerially treated with 2 lb/A atrazine produced yields comparable to the check but plots treated with 4 lb/A atrazine produced no wheat. Use of persistent herbicides for chemical fallow must be restricted until further knowledge is obtained.