MANEJO DE BUVA RESISTENTE AO GLYPHOSATE E CONSEQUÊNCIAS DO POTENCIAL FISIOLÓGICO DE SEMENTES À RESISTÊNCIA

Tiago Edu Kaspary; Fabiane Pinto Lamego; Cristiano Bellé; Adalin Cezar Moraes de Aguiar; Luan Cutti

doi:10.1590/1983-21252021v34n108rc

Authors

Tiago Edu Kaspary Department of Crop Protection, Instituto de Investigación Agropecuaria del Uruguay – La Estanzuela, Colonia https://orcid.org/0000-0003-3084-1938
Fabiane Pinto Lamego Research department, Empresa Brasileira de Pesquisa Agropecuária, Bagé, RS https://orcid.org/0000-0002-7316-5610
Cristiano Bellé Experimental Station, Phytus Group, Itaara, RS https://orcid.org/0000-0003-2247-3207
Adalin Cezar Moraes de Aguiar Phytotechnics Graduate Program, Universidade Federal de Viçosa, Viçosa, MG https://orcid.org/0000-0003-1138-8197
Luan Cutti Department of Crop Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS https://orcid.org/0000-0002-2867-7158

DOI:

https://doi.org/10.1590/1983-21252021v34n108rc

Keywords:

Conyza bonariensis. Alternative herbicides. Control. Physiological performance.

Abstract

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 × 3 × 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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