MANAGEMENT OF GLYPHOSATE-RESISTANT HAIRY FLEABANE AND CONTRIBUTION OF THE PHYSIOLOGICAL POTENTIAL OF SEEDS TO RESISTANCE

ABSTRACT Hairy fleabane (Conyza bonariensis L.) is a major weed of the conventional crop systems. Therefore, objectives present study were to assess responses glyphosate-susceptible (S) and -resistant (R) C. at various developmental stages evaluate physiological potential seeds propose alternative herbicides for control this weed. Two experiments performed in replicates. The first experiment was greenhouse, arranged 2 x 3 10 factorial design. Specifically, two hairy biotypes (S R) different (I, II, III) subjected treatments (glyphosate, chlorimuron-ethyl, metsulfuron-methyl, diclosulam, ammonium glufosinate, paraquat, paraquat+diuron, diquat, 2,4-D, control). Percentage evaluated 7, 14, 21, 28 days after application (DAT), shoot dry mass (SDM) measured DAT. second laboratory based on weight 1000 (TSW); length (SL), radicle (RL), total (TL), fresh seedling (FSM), (DSM), accelerated aging (AA) cold test (CT), germination (G) response aging. tested effectively controlled biotype R up stage -I. Seeds showed higher terms all analyzed variables exhibited greater tolerance adverse conditions during establishment. strategies management glyphosate-resistant should aim preventing new seed production.