Relationship between phyllosphere population sizes of Xanthomonas translucens pv. translucens and bacterial leaf streak severity on wheat seedlings

Kurt D. Stromberg, Linda L. Kinkel, Kurt J. Leonard

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The relationship between leaf-associated population sizes of Xanthomonas translucens pv. translucens on asymptomatic leaves and subsequent bacterial leaf streak (BLS) severity was investigated. In three experiments, X. translucens pv. translucens was spray-inoculated onto 10-day-old wheat seedlings over a range of inoculum densities (104, 105, 106, 107, and 108 CFU/ml). Lesions developed most rapidly on plants inoculated with higher densities of X. translucens pv. translucens. Leaf-associated pathogen population sizes recovered 48 h after inoculation were highly predictive of BLS severity 7 days after inoculation (R2 = 0.970, P < 0.0001). The relationship between pathogen population size on leaves and subsequent BLS severity was best described by the logistic model. Leaf-associated X. translucens pv. translucens population size and BLS severity from a particular pathogen inoculum density often varied among experiments; however, the disease severity level caused by a particular leaf-associated X. translucens pv. translucens population size was not significantly different among experiments. Biological and disease control implications of the X. translucens pv. translucens population size-BLS severity relationship are discussed.

Original languageEnglish (US)
Pages (from-to)131-135
Number of pages5
JournalPhytopathology
Volume89
Issue number2
DOIs
StatePublished - Feb 1999

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