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- Title
Carfentrazone‐ethyl and glyphosate drift inhibits uredinial formation of Austropuccinia psidii on Eucalyptus grandis leaves.
- Authors
Santos, Samuel Alves dos; Tuffi‐Santos, Leonardo David; Tanaka, Francisco André Ossamu; Sant'Anna‐Santos, Bruno Francisco; Rodrigues, Fabrício de Ávila; Alfenas, Acelino Couto
- Abstract
BACKGROUND: The response to infection of Austropuccinia psidii in resistant (CLR‐383) and susceptible (CLR‐384) Eucalyptus grandis clones, exposed to herbicide drift of carfentrazone‐ethyl, glyphosate and a mixture of these two herbicides, was evaluated at microscopic and physiological levels. RESULTS: Plants of the two clones showed symptoms of phytotoxicity caused by herbicide drift. However, net CO2 assimilation rate, height and shoot dry matter were lower in CLR‐384 than in CLR‐383. At the ultrastructure level, the leaves of both clones exposed to the herbicides showed thylakoid disorganization and accumulation of starch grains in the chloroplasts. Only plants of CLR‐384 were infected by A. psidii, but when exposed to herbicide drift, rust severity was lower than in control plants. Six days after inoculation (dai), plants of this clone exposed to the herbicides had smaller uredinia than control plants. At 12 dai, non‐herbicide treated plants showed normal uredinia, containing abundant urediniospores. By contrast, plants exposed to the herbicides were less colonized by the fungus, and the uredinia were smaller with reduced production of urediniospores, which were sometimes not even detected. CONCLUSION: Glyphosate and carfentrazone‐ethyl herbicide drift reduce infection and uredinial formation of A. psidii and to some extent induce basal resistance in a susceptible clone of E. grandis. © 2018 Society of Chemical Industry In this study, we noted that eucalyptus plants previously submitted to glyphosate and carfentrazone‐ethyl herbicide drift showed malformed uredinias, without urediniospores of A. psidii, reducing the rust severity.
- Subjects
RUST fungi; GLYPHOSATE; EUCALYPTUS grandis; THYLAKOIDS; CHLOROPLASTS
- Publication
Pest Management Science, 2019, Vol 75, Issue 1, p53
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.5163