EVALUATION OF SOME POST EMERGENCE HERBICIDES IN ORCHARDS OF IRAN

Experiments were conducted in 2006 at three apple orchards of iran, to compare the efficacy of a factorymixture of amitrol + ammonium thiocyanate + glyphosate (atg) marketed as or illico sl 30.9% applied at 2.2, 2.9, 3.6 and 4.3 kg a.i. ha-1 and new glyphosate (ng) marketed as weedmaster 360 sc 35% at 0.36 and 0.54 kg a.i. ha-1 as new herbicides with some currently applied herbicides including old glyphosate (og) marketed as roundup sl 41% and paraquat (p) marketed as gramaxone sl 20% and standard herbicides. herbicides were applied postemergence when weeds were 10 cm high. the results showed that 15 days after post emergence paraquat application, p completely controlled weeds, except in jiroft where p 30 days after application showed its effects. atg and ng after 30 days also controlled weeds. at the end of the season atg at 2.9, 3.6 and 4.3 kg a.i. ha-1, ng at 0.54 kg a.i. ha-1, p and og provided the best weed suppression.