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Use of an apparent infection threshold population of pseudomonas syringae pathovar syringae to predict incidence and severity of brown spot of bean phaseolus vulgaris



Use of an apparent infection threshold population of pseudomonas syringae pathovar syringae to predict incidence and severity of brown spot of bean phaseolus vulgaris



Phytopathology 74(11): 1334-1339



A single seed lot of snap bean (P. vulgaris) was planted at 11 sites along an east-west transect in central Wisconsin. Epiphytic population sizes of naturally occurring P. syringae pv. syringae pathogenic to bean (Psb) on symptomless bean leaflets differed among these sites. Bacterial brown spot was not detected at any site at which log10 (epiphytic Psb population size) was < 4.0 on every bean leaflet sampled. Thus, 104 colony-forming units per gram of leaflet tissue may represent an apparent infection threshold population of Psb. The frequency with which Psb populations exceeded the apparent infection threshold level was estimated graphically. A model based on this frequency estimate was highly predictive of brown spot incidence 1 wk after full flower. The presence of very high Psb populations was a more reliable predictor of disease severity than was disease incidence. This predictive model based on infection threshold is presented as preferable to models based on mean pathogen populations because infections occur on individual plant parts, rather than on some theoretical mean plant part.

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