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Tittel: The impact of solar radiation on spore survival in Phytophthora infestans, Bremia lactucae and Pseudoperonospora cubensis
Kommentar: ICPP 2008. 9th International Congress of Plant Pathology. Torino, Italy. 24.-29. august 2008
Forfattere:Le, V., Nordskog, B., Nærstad, R., Gadoury, D. & Hermansen, A.
Navn på utgivelse: Journal of Plant Pathology
Publikasjonstype: Proceeding fra int. konf. uten ISBN-nr
Volum (nr): 90 (2, Supplement)
Side(r): 164
Utgivelsesår: 2008
Avdeling: Bioforsk Plantehelse - Ås
Fagområde: Plantehelse og plantevern
Sammendrag: Aerial dispersal of inoculum is critical to the spread of many plant diseases; including potato late blight (Phytophthora infestans (Pi)), lettuce downy mildew (Bremia lactucae (Bl)) and cucurbit downy mildew (Pseudoperonospora cubensis (Pc)). In addition to relative humidity and temperature, spore survival during aerial dispersal is affected by solar irradiation (SI), in particular during long-distance transport at higher altitudes. We evaluated the potential survival of spores in air by placing detached spores of Pi, Bl and Pc on filter paper in either direct sun or shade at time intervals from 0.5 to 3 h (Pi and Bl), or up to 42 hours (Pc). Thereafter, the filter papers were placed in moist chambers for 15 min prior to incubation on pea agar (Pi) or water agar (Bl and Pc) for 24 h, before the viable spores were enumerated. Spores were considered viable if they exhibited a germ tube or released zoospores. Preliminary results show that no spores of Pi, Bl and Pc germinated after 1, 3 and 30 h exposure to direct sun, with critical SI doses near 700, 2000 and 8500 Wm-2, respectively. In shade, no Pi spores germinated after 3 h, while spores of Bl and Pc were still viable after 3 and 42 h, respectively. In Norway, the potential for long distance distribution of Pi is restricted, but more likely for Bl and Pc. Further experiments will be conducted to find the maximum survival time for spores of these pathogens under Norwegian climatic conditions.