Rust Control in Glyphosate Tolerant Wheat Following Application of the Herbicide Glyphosate

Plant Disease
J A Anderson, J A Kolmer

Abstract

In greenhouse and field trials, transgenically modified wheat (Triticum aestivum) genotypes with tolerance to glyphosate had extremely low infection types to leaf rust caused by Puccinia triticina when treated with a labeled rate of the herbicide glyphosate prior to inoculation with leaf rust. A surfactant solution and a nonglyphosate herbicide had no effect on leaf rust development on the glyphosate tolerant wheat. Glyphosate had a systemic effect in reducing leaf rust development. The leaf rust control by glyphosate decreased with reduced application rates and longer periods of time between glyphosate application and leaf rust infections. The field and greenhouse tests indicated that control of leaf rust in wheat conditioned by glyphosate is transitory and is effective for at least 21, but not more than 35, days after application. Application of glyphosate also reduced infection types on wheat caused by the stem rust fungus, Puccinia graminis f. sp. tritici. Given these results and evidence from the literature that glyphosate can have adverse effects on other pathogens, including other rust fungi, additional investigation of the fungicidal properties of glyphosate are warranted, with particular attention to the timing of glyp...Continue Reading

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Citations

Nov 19, 2005·Proceedings of the National Academy of Sciences of the United States of America·Paul C C FengKimberlee K Kidwell
Apr 13, 2019·Journal of the Science of Food and Agriculture·Cecilia Soledad CarranzaCarina Elizabeth Magnoli
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Aug 4, 2018·Pest Management Science·Samuel Alves Dos SantosAcelino Couto Alfenas
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Sep 16, 2021·PloS One·Charles P MoehsCate McGuire

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