Investigation of a New Post Emergence Herbicide,Diquat Dipromide 200 g/l Against to Weeds in Peach Orchards in Black Sea Region

Abstract

In thisstudy, Diquat 200 g/l herbicide was tested against to weeds causing damages inpeach orchards of Samsun province in the Black Sea Region in 2017. Theexperiment was carried out in 9 blocks (6 doses of target herbicide+2 doses ofreference herbicide+control) with 4 replicates in 2mx25m=50 m2 parcelsaccording to randomized blocks trial design. Herbicide effects in formed groupsaccording to variance analysis with Tukey test (5%) in the JMP program werefound to be different and significant, statistically.Weed density in peachgardens in Samsun region; shepard's purse(Capsella bursa-pastoris), bluegrass(Poa annua), sow thistle (Sonchus oleraceus), hooked bristlegrass (Stellariamedia), brome grasses (Bromus spp.), Henbitdeadnettle (Lamium amplexicaule),field marigold(Calendula arvensis) and pimpernel (Anagallis arvensis) wasevaluated as being very intensive because it is more than 10 in m2. InPost-emergence in peach gardens, Diquat dipromide (200 g/l)activeingredientherbicide was applied at the doses of 300, 400, 500, 600 and 1200ml/da while Roundup Star Glyphosate Potassium Salt was applied at the doses of300ml/da, respectively against to post-emergence weeds in peach orchards.Diquat dipromide (200 g/l)application at the dose of 300, 400, 500 ml/da wasfound ineffective against to both broad and narrow leaf weeds. At doses of only600 and 1200 ml/da, the killing efficacy of herbicide was found at 90-100% bothnarrow and broad leaf weeds . For this reason, Diquat dipromide (200 g/l) was recommendedas herbicide after discharge at a dose of 600 ml/da, which was found to beeffective at 91.71% for eight weeds in the garden. Phytotoxic effect on peachtrees was not observed at the dose of diquat dipromide 1200 ml/da.