Development of a decision aid to support the use of curative late blight fungicides
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Curative fungicides, which act within a pathogen’s incubation period, are an important component of many late blight control programs. Growers and agronomists would benefit from a simple decision aid to provide justification for the use of curative products. This study aims to ultimately produce such an aid, and interim results which form the basis of its parameters are presented here. Data from glasshouse bioassays with a representative curative fungicide (fluopicolide + propamocarb) and a susceptible potato variety (King Edward) suggest that curative control rapidly declines from 20 hours post inoculation with an aggressive isolate, and from 56 hours with a less aggressive isolate. Further results from bioassays and field trials confirm that post infection temperatures increase the rate of pathogen development up until an optimum, after which it falls, and that varieties with higher resistance ratings increase the time period for curative control.
Other Titles/Title of Conference
Crop Production in Northern Britain 2018, Dundee, UK
Journal Title/Title of Proceedings
Proceedings Crop Production in Northern Britain 2018
Copyright © 2018 The authors. Copies of the full proceedings can be found at: http://www.sipr.ac.uk/CPNB/CPNB_initial.php#PROCEEDINGS