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Relationship Among Concentrations of Sphaerotheca macularis Conidia in the Air, Environmental Conditions, and the Incidence of Powdery Mildew in Strawberry

August 2004 , Volume 88 , Number  8
Pages  878 - 881

C. Blanco , B. de los Santos , C. Barrau , F. T. Arroyo , M. Porras , and F. Romero , C.I.F.A. Las Torres -Tomejil, Apdo. de Correos Oficial, Alcalá del Río. 41200 Sevilla, Spain

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Accepted for publication 12 April 2004.

Atmospheric concentrations of Sphaerotheca macularis conidia were monitored for 2 years on a strawberry crop in Huelva (southwestern Spain). The presence of airborne conidia was determined to assess the role of weather conditions on conidial release. The relationship between airborne conidia and incidence of powdery mildew on fruit was also studied. Concentrations of conidia were estimated with a Burkard volumetric spore sampler. The presence of conidia was related to temperature, relative humidity, and rainfall, with a positive correlation for the first factor and a negative correlation with the other two. The presence of conidia in the air was positively correlated with disease incidence. A diurnal pattern of conidia release was observed.

Additional keywords: aerobiology, epidemiology

© 2004 The American Phytopathological Society