Efficacy of herbicides and herbicide combinations at winter oilseed canola (Brassica napus L.)

GROZI DELCHEV1 and TEODORA BARAKOVA2
1 Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria
2 Field Crops Institute, 6200, Chirpan, Bulgaria

Abstract

DELCHEV, G. and T. BARAKOVA, 2018. Efficacy of herbicides and herbicide combinations at winter oilseed canola (Brassica napus L.). Bulg. J. Agric. Sci., 24 (Suppl. 1): 25–32

In the period 2012-2014 a field experiment was carried out with the conventional Maximus hybrid РХ113 (Brassica napusL). A total of 16 variants were investigated. They included 8 herbicides: Salsa 75 WG (ethametsulfuron-methyl), Butisan duo (metazachlor + dimethenamid), Butisan max (metazachlor + quinmerac + dimethenamid), Select super 120 EC (clethodim), Targa super 5 EC (quizalofop-P-ethyl), Galera super (clopyralid + picloram + aminopyralid), Modown 4 F (bifenox) and Aramo 50 (tepraloxydim) and 3 adjuvants: Trend 90, Codacide and Silwet L-77. By including a canola hybrid of the Maximus product line, the need of growth regulators is eliminated. Herbicide Salsa has very good efficacy against all broadleaved weeds, including against cruciferous weeds Sinapis arvensis L. and Raphanus raphanistrum L. and volunteers of Coriandrumsativum L. and Silybum marianum Gaertn. The efficacy of the herbicide Salsa in single use is higher when applied with the adjuvant Trend compared to the adjuvants Codacide and Silwet. Salsa must be combined with antigraminaceous herbicide at mixed weed infestation with graminaceous and broadleaved weeds. In tank mixtures of Salsa and Butisan max and Butisan duo, the herbicide efficacy and after-action against graminaceous weeds are higher when applied with the adjuvant Codacide. In concomitant use of Salsa and Select super with the adjuvant Codacide synergetic effect is reported. In the tank mixture of Salsa + Targa super, higher efficacy is reported in its combined use with the adjuvant Trend. Vegetation-applied herbicide Galera super has no efficacy against Sinapis arvensis L. and Raphanus raphanistrum L. and has poorer efficacy against volunteers of Coriandrum sativum L. and Silybum marianum Gaertn. Autumn treatment by herbicide combination Modown + Aramo cause poor phytotoxicity at canola. Spring treatment with Modown + Aramo leads to a high and more difficult to overcome phytotoxicity.

Keywords: winter oilseed canola; herbicides; tank mixtures; efficacy; selectivity; seed yield

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