Journal
CROP PROTECTION
Volume 151, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cropro.2021.105839
Keywords
Phakopsora pachyrhizi; Chemical control; Management; Profitability
Categories
Funding
- Programa de Pos-graduacao em Fitopatologia (UFV)
- CNPq-Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
Ask authors/readers for more resources
The study showed that adding multi-site fungicides in commercial premixes is a technically and cost-effective approach for controlling soybean rust.
Soybean rust (SBR), caused by Phakopsora pachyrhizi, is controlled with sequential applications of commercial premixes containing two and, more recently, three site-specific fungicides. However, their efficacy has been reduced due to the development of fungicide resistance in the fungal population; hence the use of multi-site fungicides in tank mixing has been encouraged. In this work we used data from 45 uniform fungicide trials conducted across eight Brazilian states during three crop seasons (2014/15, 2015/16, and 2017/18) to identify scenarios when the practice of adding multi-site fungicides in commercial premixes was both technical- and cost-effective. Premixes of quinone outside inhibitor (QoI) + demethylation inhibitors (DMI) or succinate dehydrogenase inhibitors (SDHI) were applied alone, or tank mixed with multi-site fungicides. Three premixes (PICOxystrobin + CYPRoconazole, PYRAclostrobin + FLUXapyroxad and AZOXystrobin + BENZovindiflupyr) were tank mixed with one of three multi-site fungicides (+MANCozeb, +COPpeR oxychloride, and +ChLORothalonil). The benefits from tank mixing a multi-site tended to be highest for the least effective premix. Improvements in control efficacy ((C) over bar, percent point; p.p.) and yield response ((D) over bar, kg/ha) ranged from 3 to 15 p.p. and 58-240 kg/ha, respectively. The improvements in (C) over bar and (D) over bar were affected by severity in the non-treated check; significantly higher improvements in (D) over bar were determined in trials experiencing high SBR severity levels (>80%). The economic analysis for scenarios of soybean price and multi-site costs showed that the addition of +MANC, given its lower price, was more likely to be profitable compared with +CLOR and +COPR, particularly when tank mixed with the least effective commercial premix.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available