Phytopathology (2000) 90, 78-84

E.S.G. Mizubuti, D.E. Aylor and W.E. Fry (2000)
Survival of Phytophthora infestans sporangia exposed to solar radiation
Phytopathology 90 (1), 78-84
Abstract: The effect of solar irradiance (SI) on the viability of sporangia of isolates belonging to two clonal lineages, US-1 and US-8, of Phytophthora infestans was assessed. Exposure during a 3-h period on sunny days (SI > 600 W/m²) drastically reduced germination regardless of the time of day of the exposure. After 1 h of exposure on sunny days, the viability of sporangia decreased by approximately 95%, and the effective time necessary to inactivate 95% of the sporangia was 1.1 h. The effective dose to inactivate 95% of the sporangia on sunny days was 2.6 MJ/m². On overcast (SI < 300 W/m²) days, survival after 3 h was reduced only slightly. Thus, other variables being equal, sporangia will survive hours longer in the atmosphere on cloudy days than on sunny days.
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Database assignments for author(s): William E. Fry, Eduardo S.G. Mizubuti

Research topic(s) for pests/diseases/weeds:
transmission/dispersal of plant diseases
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phytophthora infestans