Skip to main content
Research article - Peer-reviewed, 2022

Reduced efficacy of biocontrol agents and plant resistance inducers against potato early blight from greenhouse to field

Stridh, Linnea J.; Mostafanezhad, Hadis; Andersen, Christian B.; Odilbekov, Firuz; Grenville-Briggs, Laura; Lankinen, Asa; Liljeroth, Erland

Abstract

Early blight in potato, caused by Alternaria solani, is mainly controlled by frequent applications of synthetic fungicides. Reducing the use of synthetic fungicides in agriculture is desired to reach an overall sustainable development since the active components can be harmful for humans and for the ecosystem. In integrated pest management, IPM, the idea is to combine various measures, including optimized crop management, crop rotation, use of resistant cultivars, biological control agents (BCAs), plant resistance inducers, and fertilizers, to decrease the dependence on traditional chemical fungicides. In this paper, we present the results from greenhouse and field trials where we evaluated the effect of strategies aimed at reducing our reliance on synthetic fungicides including treatments with biological control agents (BCAs) (Pythium oligandrum, Polygandron (R), and Bacillus subtilis, Serenade (R)) and plant resistance inducers (silicon products HortiStar (R) and Actisil (R)) for early blight in potato. The agents were applied separately or in combination with each other or with synthetic fungicides. In the greenhouse, trials application of these agents resulted in 50-95% reduction of infection by A. solani, but their combination did not generally improve the outcome. However, the effects were much smaller in the hand-sprayed field trials, 20-25% disease reduction and almost disappeared in full-scale field trials where application was done with tractor sprayers. In this article, we discuss possible reasons behind the drop in efficacy from greenhouse trials to full-size field evaluation.

Keywords

Alternaria solani; Biological control; Biocontrol agents; Plant resistance inducer; Potato disease; Field trials

Published in

Journal of Plant Diseases and Protection
2022,
Publisher: SPRINGER HEIDELBERG

Authors' information

Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Mostafanezhad, Hadis
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Mostafanezhad, Hadis
University of Tehran
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology

UKÄ Subject classification

Agricultural Science

Publication Identifiers

DOI: https://doi.org/10.1007/s41348-022-00633-4

URI (permanent link to this page)

https://res.slu.se/id/publ/118267