Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 538246
Title Risks for infection of strawberry plants with an aerosolized inoculum of Xanthomonas fragariae
Author(s) Wolf, J.M. van der; Evenhuis, A.; Kastelein, P.; Krijger, M.C.; Funke, V.Z.; Berg, W. van den; Moene, A.F.
Source European Journal of Plant Pathology 152 (2018)3. - ISSN 0929-1873 - p. 711 - 722.
Department(s) Biointeractions and Plant Health
OT Team Schimmels Onkr. en Plagen
OT Team Int. Prod. & Gewasinn.
Meteorology and Air Quality
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Air sampling - Angular leaf spot - Fragaria x ananasa - Infection thresholds - Particle counters - TaqMan assay

Xanthomonas fragariae is the causative agent of angular leaf spot of strawberry, a quarantine organism in plant propagation material in the European Union. Field experiments were conducted to assess the risks for infection of strawberry plants through dispersal of an aerosolized inoculum. In practice, pathogen aerosols can be formed during mowing of an infected crop or by water splashing on symptomatic plants during overhead irrigation or rain. In our experiments, aerosols were generated by spraying suspensions of X. fragariae with a density of 108 cfu ml−1 or water under pressure vertically up into the air. In strawberry plants (cv Elsanta) placed at 1.3, 5 and 10 m distance downwind from the spray boom, infections were found, as evidenced with a combination of dilution–plating and molecular techniques, but more frequently in plants wetted prior to inoculation than in plants kept dry. A logarithmic decrease in infection incidence was found with the distance to the inoculum source. Symptomatic plants were found up to 5 m distance from the inoculum source. No infected plants were found in plants placed 4 m upwind or treated with water. In glasshouse studies, it was shown that under conditions favorable for disease development, spray-inoculation of strawberry plants with estimated densities of X. fragariae as low as 2000 cfu per plant were able to cause symptoms both in cv Elsanta and cv Sonata. Results indicate that there is a considerable risk on infections of strawberry plants exposed to aerosolized inoculum.

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