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Paper Information

Journal:   PLANT ECOPHYSIOLOGY (ARSANJAN BRANCH)   winter 2018 , Volume 9 , Number 31 #r00474; Page(s) 0 To 0.

Control of spring and summer weeds in orchards by pre and post herbicides and mixture of them

* Iranian Plant Protec. Res. Inst., Tehran
These experiments were conducted in order to study effect of pre and post emergence new herbicides on grass and broad leaf weeds in vine orchards in Qazvin and apple orchards in Tehran. Experimental design was factorial with two factors (A and B) and three replications. "A" factor treatments were, 1) diuron (WP 80%) 2 kg/ha, 2) napropamide (SC 45%) 9 l/ha, 3) oxyfluorfen (EC 24%) 2 lit/ha, 4) trifluralin (EC 48%) 2. 5 l/ha, and 5) check (no herbicide). "B" factor treatments were 1) glayphosate (SL 41%) 6 l/ha +8 kg ammonium sulfate/ha, 2) glayphosate (SL 41%) 6+6 l/ha plus ammonium sulfate 8+8 kg/ha, 3) triclopyr (EC 62%) 2 l/ha, and 4) triclopyr 2+2 l/ha. The results showed that pre emergence herbicides, especially napropamide, oxyfluorfen and trifluralin controlled annual winter weeds. One time use of glayphosate could control annual weeds, but not perennial weeds. One and two times use of triclopyr and two times glyphosate controlled perennial weeds. Use of pre emergence plus post emergence herbicides controlled perennial weeds well. Napropamide and trifluralin plus triclopyr reduced weeds, but diuron plus post emergence herbicides provided best broadleaf weed suppression. As compared to glayphosate, triclopyr controlled weeds with delay.
Keyword(s): pre emergence herbicides,post emergence herbicides,weeds dry weight,orchards
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