8170: Simultaneous epidemic development of scald (Rhynchosporium secalis) and net blotch (Drechslera teres) on individual leaf layers of a spring barley crop
(2006) Simultaneous epidemic development of scald (Rhynchosporium secalis) and net blotch (Drechslera teres) on individual leaf layers of a spring barley crop. Plant Pathology.
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Summary
Several foliar pathogen species are commonly found developing simultaneously in a field and for several species combinations interaction has been shown to affect total disease level.
In the present study, a field trial with application of R. secalis (causes scald) and D. teres (causes net blotch) was conducted with three spring barley varieties. Each pathogen was applied alone as well as in combination with the other one, either together or 26 days apart. Disease severity, stratified by leaf layer, was assessed during the season on individual leaves.
Association analysis showed a negative relationship between scald and net blotch severity on individual leaves for several combinations of leaf layer and variety, indicating antagonistic effects between the two diseases in the field.
Net blotch severity reached up to 35 % and scald severity 20 % on individual leaves. Analyses of variance of maximum disease levels of epidemics on individual leaf layers confirmed the antagonistic patterns, as levels of either disease often were lower when both pathogens had been inoculated. These effects were not so strong though, as to be evidenced as non-additive effects of the two pathogens on total disease level.
Disease development was described by fitting an exponential model to severity data over time for each leaf layer per variety and treatment. Parameters of the exponential model showed similar patterns as maximum disease severity but with fewer significant effects.
The results emphasize the epidemiological relevance of interactions between pathogens in the field and of considering leaf layer-specific dynamics of crop growth and disease development.
| Document Language: | English |
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| Subject Areas: | Crop husbandry > Crop health, quality, protection |
| Research affiliation: | Denmark > KVL - The Royal Veterinary and Agricultural University Denmark > DARCOF II (2000-2005) > VI.2 (BAR_OF) Characteristics of spring barley varieties for organic farming Denmark > DIAS - Danish Institute of Agricultural Sciences Denmark > RISØ - Risø National Laboratory |
| Funding Part: | 75-100% |
| Total budget (Euro): | 0 |
| Orgprints ID Number: | 8170 |
| Contact: | Østergård, Senior Research Specialist Hanne |
| Deposited On: | 19 April 2006 |
| EPrint Type: | Journal paper |
| Published?: | Unpublished |
| Peer Review Status: | Submitted for peer-review but not yet accepted |
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