Journal
REVISTA CAATINGA
Volume 34, Issue 1, Pages 68-79Publisher
UNIV FED RURAL SEMI-ARIDO-UFERSA
DOI: 10.1590/1983-21252021v34n108rc
Keywords
Conyza bonariensis; Alternative herbicides; Control; Physiological performance
Categories
Funding
- State Research Support Foundation of Rio Grande do Sul - FAPERGS [01/2011, 11/1989-0]
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The study assessed the responses of glyphosate-susceptible and -resistant hairy fleabane at different developmental stages and evaluated the physiological potential of seeds. Results showed that alternative herbicides effectively controlled resistant biotype at early stages, and resistant seeds exhibited stronger physiological potential.
Hairy fleabane (Conyza bonariensis L.) is a major weed of the conventional crop systems. Therefore, the objectives of the present study were to assess the responses of glyphosate-susceptible (S) and - resistant (R) C. bonariensis at various developmental stages and evaluate the physiological potential of seeds to propose alternative herbicides for the control of this weed. Two experiments were performed in replicates. The first experiment was performed in a greenhouse, arranged in a 2 x 3 x 10 factorial design. Specifically, two hairy fleabane biotypes (S and R) at different developmental stages (I, II, and III) were subjected to various treatments (glyphosate, chlorimuron-ethyl, metsulfuron-methyl, diclosulam, ammonium glufosinate, paraquat, paraquat+diuron, diquat, 2,4-D, and control). Percentage control was evaluated at 7, 14, 21, and 28 days after the application of the treatments (DAT), and shoot dry mass (SDM) was measured at 28 DAT. The second experiment was performed in a laboratory to evaluate the physiological potential of seeds based on the weight of 1000 seeds (TSW); shoot length (SL), radicle length (RL), total length (TL), fresh seedling mass (FSM), dry seedling mass (DSM), accelerated aging (AA) and cold test (CT), and germination (G) in response to cold and accelerated aging. The alternative herbicides tested effectively controlled biotype R up to the stage-I. Seeds of biotype R showed higher physiological potential in terms of all analyzed variables and exhibited greater tolerance to adverse conditions during seedling establishment. Therefore, strategies for the management of glyphosate-resistant hairy fleabane should aim at preventing new seed production.
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