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Agronomy 2018, 8(8), 157;

First Case of Conyza canadensis from Hungary with Multiple Resistance to Glyphosate and Flazasulfuron

Department of Agricultural Chemistry and Edaphology, University of Cordoba, 14071 Cordoba, Andalusia, Spain
Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil 56199-11367, Iran
Monsanto Europe SA, 1150 Brussels, Belgium
Department of Entomology, Federal University of Viçosa, Viçosa, Minas Gerais 36570-900, Brazil
Author to whom correspondence should be addressed.
Received: 10 July 2018 / Revised: 13 August 2018 / Accepted: 13 August 2018 / Published: 20 August 2018
(This article belongs to the Special Issue Weed Management & New Approaches)
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Conyza canadensis is a species invading large areas throughout the world, mainly due to its ability to evolve herbicide resistance. In Hungary, extensive areas have been infested by this species due to the difficulty in controlling it with glyphosate. To determine whether poor control was a result of misapplication or glyphosate resistance, eight suspected glyphosate-resistant C. canadensis populations from different Hungarian regions were studied. In whole-plant dose-response assays with glyphosate, the LD50 and GR50 values (survival and fresh weight reduction at 50% relative to the untreated control, respectively) indicated that resistance was confirmed in five of the eight populations (H-5 population being the most resistant). Additionally, the shikimic acid accumulation tests corroborated the results observed in the dose–response assays. 11 alternative herbicides from six different modes of action (MOA) were applied at field doses as control alternatives on populations H-5 and H-6 (both in the same regions). The H-5 population showed an unexpected resistance to flazasulfuron (ALS-inhibitor). The ALS enzyme activity studies indicated that the I50 for H-5 with flazasulfuron was 63.3 times higher compared to its correspondent susceptible population (H-6). Therefore, the H-5 population exhibited multiple-resistance to flazasulfuron and glyphosate, being the first case reported in Europe for these two MOA. View Full-Text
Keywords: ALS-inhibitors; horseweed; multiple-resistance; alternative chemical control ALS-inhibitors; horseweed; multiple-resistance; alternative chemical control

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Palma-Bautista, C.; Tahmasebi, B.K.; Fernández-Moreno, P.T.; Rojano-Delgado, A.M.; Alcántara de la Cruz, R.; De Prado, R. First Case of Conyza canadensis from Hungary with Multiple Resistance to Glyphosate and Flazasulfuron. Agronomy 2018, 8, 157.

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