In order to evaluate RESISTANCE of Phalaris minor biotypes, sampled from wheat fields of Fars AND Golestan provinces, to ACCASE inhibiting HERBICIDEs, a dose-response study was conducted under controlled conditions in greenhouse of Ferdwosi University of Mashhad. The results indicated that AR, SR3, MR4, FR2, FR4, AND FR8 populations of Fars AND GR2-1 biotype from Golestan have been resistant to diclofop-methlyl. Different levels of RESISTANCE maybe are because of involving different mechanisms in studied populations. AR, SR3, AND MR4 showed a cross-RESISTANCE to the applied HERBICIDEs. These biotypes indicated a 5- to 11-fold AND a 7- to 8-fold increase in RESISTANCE to diclofop-methlyl AND clodinafop-propargyl, respectively compared with the susceptible biotype. Among these biotypes, SR3 showed the highest RESISTANCE to both HERBICIDEs.