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First report of Amaranthus viridis resistance to herbicides Planta Daninha
Francischini,A.C.; Constantin,J.; Oliveira JR.,R.S.; Santos,G.; Braz,G.B.P.; Dan,H.A..
Due to the limited number of herbicides registered for the control of dicot weeds in cotton crops, ALS inhibitors have been used on an intensive and recurrent basis. Given that, cases of poor weed control have been described after application of these herbicides in the main cotton producing areas in Brazil, the purpose of the present work was to evaluate the occurrence of resistance to ALS herbicides in Amaranthus viridis biotypes from those areas. Dose-response curves were prepared after pre-emergence applications of trifloxysulfuron-sodium (0; 1.8; 3.7; 7.5; 15 and 30 g ha-1) and pyrithiobac-sodium (0; 35; 70; 140; 280 and 560 g ha-1), equivalent to 0, ¼, ½, 1, 2 and 4 times the recommended commercial rates. The selection of trifloxysulfuron-sodium...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Trifloxysulfuron-sodium; Pyrithiobac-sodium; Slender amaranth; ALS-inhibiting herbicides.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000300013
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Resistance of Amaranthus retroflexus to acetolactate synthase inhibitor herbicides in Brazil Planta Daninha
Francischini,A.C.; Constantin,J.; Oliveira Jr.,R.S.; Santos,G.; Franchini,L.H.M.; Biffe,D.F..
When in competition with cotton, Amaranthus retroflexus can cause high yield losses. Due to the limited availability of selective herbicides registered for post emergence control of this weed, the same herbicides have been used repeated times over the last few years, which may have selected resistant biotypes. Biotypes of A. retroflexus collected from the main areas of cotton cultivation in Brazil were submitted to dose-response trials, by applying the herbicides trifloxysulfuron-sodium and pyrithiobac-sodium in doses equivalent to 0, ¼, ½, 1, 2 and 4 times the recommended rates. Resistance to ALS inhibitors was confirmed in biotypes of A. retroflexus. Biotype MS 2 from Mato Grosso do Sul, was cross-resistant to both trifloxysulfuron-sodium and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Trifloxysulfuron-sodium; Pyrithiobac-sodium; Cross-resistance; ALS inhibitors.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200022
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