How glyphosate affects plant disease development: it is more than enhanced susceptibility. Issue 5 (30th January 2017)

• Record Type: Journal Article
• Authors: Hammerschmidt, Ray
• Is Part Of: Pest management science. Volume 74:Issue 5(2018)
• Page Start: 1054
• Page End: 1063
• Publication Date: 2017-01-30
• Subjects: glyphosate -- glyphosate resistance -- plant disease -- plant defense -- phytoalexins -- shikimic acid pathway -- fungicide -- root disease -- Pythium -- Rhizoctonia -- Fusarium -- Sclerotinia -- Pseudomonas -- Clavibacter -- rust diseases -- sugarbeet -- soybean -- barley -- wheat -- bean; Pests -- Control -- Periodicals; Pesticides -- Periodicals; 632.9
• DOI: 10.1002/ps.4521
• Languages: English
• ISSNs: 1526-498X

Abstract

Abstract: Glyphosate has been shown to affect the development of plant disease in several ways. Plants utilize phenolic and other shikimic acid pathway‐derived compounds as part of their defense against pathogens, and glyphosate inhibits the biosynthesis of these compounds via its mode of action. Several studies have shown a correlation between enhanced disease and suppression of phenolic compound production after glyphosate. Glyphosate‐resistant crop plants have also been studied for changes in resistance as a result of carrying the glyphosate resistance trait. The evidence indicates that neither the resistance trait nor application of glyphosate to glyphosate‐resistant plants increases susceptibility to disease. The only exceptions to this are cases where glyphosate has been shown to reduce rust diseases on glyphosate‐resistant crops, supporting a fungicidal role for this chemical. Finally, glyphosate treatment of weeds or volunteer crops can cause a temporary increase in soil‐borne pathogens that may result in disease development if crops are planted too soon after glyphosate application. © 2017 Society of Chemical Industry Abstract : Glyphosate, through its mode of action, is thought to affect disease. This review examines different ways that this herbicide impacts disease through action on the plant, the pathogen and environment.