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.