Stubble trouble! Moisture, pathogen fitness and cereal type drive colonisation of cereal stubble by three fungal pathogens

Title
Stubble trouble! Moisture, pathogen fitness and cereal type drive colonisation of cereal stubble by three fungal pathogens
Publication Date
2022
Author(s)
Petronaitis, Toni
( author )
OrcID: https://orcid.org/0000-0003-1559-6073
Email: tholmes8@myune.edu.au
UNE Id une-id:tholmes8
Forknall, Clayton
Simpfendorfer, Steven
Backhouse, David
( author )
OrcID: https://orcid.org/0000-0003-0663-6002
Email: dbackhou@une.edu.au
UNE Id une-id:dbackhou
Flavel, Richard
( author )
OrcID: https://orcid.org/0000-0001-7867-2104
Email: rflavel3@une.edu.au
UNE Id une-id:rflavel3
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Springer Dordrecht
Place of publication
The Netherlands
DOI
10.1007/s13313-022-00860-1
UNE publication id
une:1959.11/55122
Abstract
Stubble-borne cereal diseases are a major constraint to production in Australia, with associated costs rising as a result of increased adoption of conservation agriculture systems. The fungal pathogens that cause these diseases can saprotrophically colonise retained cereal residues, which may further increase inoculum levels post-harvest. Hence, saprotrophic colonisation by the stubble-borne fungal pathogens Fusarium pseudograminearum, Pyrenophora tritici-repentis and Bipolaris sorokiniana were compared under a range of moisture conditions for stubble of six cereal varieties (two bread wheat, two barley, one durum wheat and one oat). Sterile cereal stubble was inoculated separately with two isolates of each pathogen and placed, standing, under constant relative humidity conditions (90, 92.5, 95, 97.5 and 100%) for 7 days at 25 °C. Stubble was then cultured in increments of 1 cm to determine the percentage colonisation height of each tiller. Fusarium pseudograminearum colonised farther within tillers, leaving a greater proportion of the standing stubble colonised compared with B. sorokiniana and P. tritici-repentis, suggesting F. pseudograminearum has higher saprotrophic fitness. Saprotrophic colonisation also increased with increasing relative humidity for all pathogens and varied by cereal type. Disease management strategies, such as reduced cereal harvest height, may limit saprotrophic colonisation and improve stubble-borne disease management in conservation agriculture systems.
Link
Citation
Australasian Plant Pathology, 51(3), p. 363-368
ISSN
1448-6032
0815-3191
Start page
363
End page
368
Rights
Attribution 4.0 International

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