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Article

Effect of Adjuvant on Glyphosate Effectiveness, Retention, Absorption and Translocation in Lolium rigidum and Conyza canadensis

1
Department of Agricultural Chemistry and Edaphology, University of Cordoba, 14071 Cordoba, Spain
2
Department of Crop Science, Laboratory of Agronomy, Agricultural University of Athens, 75 Iera Odos Street, 11855 Athens, Greece
3
Agricultural Cooperative of Mesolonghi-Nafpaktia, 30200 Mesolonghi, Greece
4
Department of Agricultural Parasitology, Chapingo Autonomous University, 56230 Texcoco, Mexico
*
Author to whom correspondence should be addressed.
Plants 2020, 9(3), 297; https://doi.org/10.3390/plants9030297
Received: 14 January 2020 / Revised: 10 February 2020 / Accepted: 24 February 2020 / Published: 1 March 2020
(This article belongs to the Special Issue Weed Ecology and Management)
Glyphosate retention, absorption and translocation with and without adjuvant were examined in Lolium rigidum and Conyza canadensis in greenhouse and laboratory settings to develop an understanding of the influence of the selected adjuvant on glyphosate activity. Tests on whole plants show that the dose of herbicide needed to reduce dry weight by 50% (GR50) or plant survival (LD50) decreases by mixing glyphosate and adjuvant to 22%–24% and 42%–44% for both populations of L. rigidum and C. canadensis, respectively. This improvement in efficacy could be attributed to the higher herbicide retention and lower contact angle of the glyphosate + adjuvant drops on the leaf surface compared to the glyphosate solution alone. Plants of both species treated with 14C-glyphosate + adjuvant absorbed more glyphosate compared to non-adjuvant addition. Furthermore, the movement of the herbicide through the plant was faster and greater with the adjuvant. Our results reveal that the use of adjuvants improves the effectiveness of glyphosate in two of the most important weeds in agricultural crops in Mediterranean countries. View Full-Text
Keywords: rigid ryegrass; horseweed; efficacy; retention; absorption and translocation rigid ryegrass; horseweed; efficacy; retention; absorption and translocation
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MDPI and ACS Style

Palma-Bautista, C.; Vazquez-Garcia, J.G.; Travlos, I.; Tataridas, A.; Kanatas, P.; Domínguez-Valenzuela, J.A.; De Prado, R. Effect of Adjuvant on Glyphosate Effectiveness, Retention, Absorption and Translocation in Lolium rigidum and Conyza canadensis. Plants 2020, 9, 297. https://doi.org/10.3390/plants9030297

AMA Style

Palma-Bautista C, Vazquez-Garcia JG, Travlos I, Tataridas A, Kanatas P, Domínguez-Valenzuela JA, De Prado R. Effect of Adjuvant on Glyphosate Effectiveness, Retention, Absorption and Translocation in Lolium rigidum and Conyza canadensis. Plants. 2020; 9(3):297. https://doi.org/10.3390/plants9030297

Chicago/Turabian Style

Palma-Bautista, Candelario, Jose G. Vazquez-Garcia, Ilias Travlos, Alexandros Tataridas, Panagiotis Kanatas, José A. Domínguez-Valenzuela, and Rafael De Prado. 2020. "Effect of Adjuvant on Glyphosate Effectiveness, Retention, Absorption and Translocation in Lolium rigidum and Conyza canadensis" Plants 9, no. 3: 297. https://doi.org/10.3390/plants9030297

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