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Germinability of Venturia inaequalis Conidia Exposed to Sunlight

June 1997 , Volume 87 , Number  6
Pages  628 - 633

Donald E. Aylor and Soumaila Sanogo

Department of Plant Pathology and Ecology, The Connecticut Agricultural Experiment Station, P.O. Box 1106, New Haven 06504

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Accepted for publication 13 March 1997.

Detached conidia of Venturia inaequalis were exposed simultaneously outdoors to direct sunlight or in an adjacent ventilated enclosure in darkness for periods ranging from 0.5 to 16.5 h. In addition, conidia were either exposed or not exposed to UV light (254 nm) from 1 to 64 min in the laboratory. After exposure, conidia were placed on water agar in closed petri dishes and allowed 24 h to germinate. Germinability of conidia in the laboratory was reduced up to 95% by doses of UV254 of 8.1 to 10.8 kJ m-2.Germinability of conidia in the field was reduced up to 95% by doses of UV-B of about 44 kJ m-2. A significant percentage of conidia survived radiation doses equivalent to 12 h in full sunlight.

Additional keywords: apple scab, long-distance spore transport, solar irradiance, Spilocaea pomi, spore survival, spore transport, vapor pressure deficit.

© 1997 The American Phytopathological Society