Glyphosate reduces urediniospore development and Puccinia psidii disease severity on Eucalyptus grandis

Abstract

Reductions in germination and apressorium formation of P. psidii urediniospores with increasing glyphosate dose indicate that a lower severity and intensity of the disease may perhaps be due to blockage of the shikimic acid pathway in the fungal metabolic system.

Glyphosate Effects on Plant Mineral Nutrition, Crop Rhizosphere Microbiota, and Plant Disease in Glyphosate-Resistant Crops

“…216 Tuffi Santos at al. 218 showed that glyphosate reduced the severity of rust caused by Puccinia pdisii on Eucalyptus grandis . They found that there was a systemic effect of glyphosate on rust development as illustrated by reduced urediniospore germination and appressorium formation on tissues that were not directly treated with the herbicide.…”

Carfentrazone‐ethyl and glyphosate drift inhibits uredinial formation of Austropuccinia psidii on Eucalyptus grandis leaves

“…Several studies report in vitro glyphosate inhibition of spore germination and hyphal growth of various fungal species, 40,41 including A. psidii. 11 This inhibition may occur in the shikimic acid pathway, which is affected by glyphosate in some fungi. 42 This molecule has a negative effect on the development of some fungal diseases, mainly rusts.…”

“…ha −1 carfentrazone‐ethyl + 86.4 g a.i. ha −1 glyphosate), corresponding to 6% of the manufacturer's recommended dose of each herbicide . Plants sprayed with water served as the control.…”

“…In both assays, inoculation was performed 2 days after herbicide application (daa). 11 The UFV-2 isolate of A. psidii (race 1) obtained from E. grandis plants 22 and multiplied in plants of Sygyzium jambos was used. An inoculum suspension (2 × 10 4 urediniospores mL −1 ) was homogenously sprayed on both sides of the leaf blade of plants, using a De Vilbiss ® atomizer #15, attached to an electric compressor.…”

Ação herbicida na severidade de doenças em plantas cultivadas

“…Besides the indirect effect on the plants' defense mechanisms, the herbicides can present an inhibition effect in the germination of spores and/or in vitro growth of several fungi (Larson et al, 2006;Soares et al, 2008;Rosa et al, 2010;Tuffi-Santos et al, 2011). Therefore, in this review, we aimed to present and discuss the relationship between the use of herbicides and the severity of diseases of cultivated plants.…”