Journal of Plant Pathology (1998) 80, 151-156

G.M. Balestra and L. Varvaro (1998)
Seasonal fluctuations in kiwifruit phyllosphere and ice nucleation activity of Pseudomonas viridiflava
Journal of Plant Pathology 80 (2), 151-156
Abstract: Seasonal fluctuations of Pseudomonas viridiflava, the causal agent of bacterial blight, were investigated on the kiwifruit phyllosphere in relation to ice nucleation activity, at different sites in central Italy (north of Latium), from October 1995 until September 1996. The pathogen was detected during the different seasons on leaves, twigs, buds and fruits with population values ranging between 1.1x10¹ and 2x10⁶ cfu cm^-2 with maxima in spring and autumn. The pathogen was also present in significant amounts in several winter and summer months. No P. viridiflava was detected on flowers. Most of the bacterial isolates showed ice nucleation activity, manifested at relatively low concentrations (10⁴ cfu ml^-1) and at temperatures slightly below 0°C (-3 °C). Epidemiological implications are discussed.
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Database assignments for author(s): Giorgio Mariano Balestra, Leonardo Varvaro

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pseudomonas viridiflava	Kiwi (Actinidia)	Italy