caa a22 4500 467929270 CHVBK 20180406152938.0 cr unu---uuuuu 170328e20060301xx s 000 0 eng 10.1007/s10658-005-5804-6 doi (NATIONALLICENCE)springer-10.1007/s10658-005-5804-6 Effect of Climatic Factors on Powdery Mildew Caused by Sphaerotheca macularis f. sp. Fragariae on Strawberry [Elektronische Daten] [Liat Amsalem, Stanley Freeman, Dalia Rav-David, Yehuda Nitzani, Abraham Sztejnberg, Ilaria Pertot, Yigal Elad] Powdery mildew of strawberry is caused by the obligate pathogenic fungus Sphaerotheca macularis f. sp. fragariae. The disease affects the leaves, flowers and fruit of this crop. This study examined the effects of different environmental factors on disease cycle components (germination, conidiation and survival) in strawberry to determine which conditions limit the progress of the disease. The optimal environmental conditions for conidial germination and conidial germ tube length ranged between 15 and 25°C with relative humidity (RH) higher than 75%, but less than 98%. High light intensity reduced germination and hyphal growth. The viability of conidia on infected leaves was examined at temperatures ranging from 15 to 35°C at 80-85% RH. Conidia survival declined over time, but a certain percentage of conidia remained active after 5months incubation. The rate of conidial germination was significantly higher on young leaves than on older leaves. This observation was consistent across all four tested cultivars. Conidiation at 70-75% RH was similar to that at 80-85%, but greater than that at ≥95% RH. The shortest time from inoculation to appearance of the first disease symptoms was 4days, at 20 and 30°C with RH above 75%. In growth chambers, temperatures of 10 and 30°C, RH above 95%, radiation of 7000lux and the use of a more tolerant cultivar were all detrimental to disease development. In general, the environmental conditions required for germination and dispersal of powdery mildew are conducive to disease progress under strawberry production conditions in Israel. Furthermore, viability and survival of the pathogen during and between seasons appears to be dependent on asexual inoculum production. Springer, 2006 environmental factors nationallicence Fragaria × ananassa nationallicence light nationallicence relative humidity nationallicence temperature nationallicence Amsalem Liat Department of Plant Pathology, ARO, The Volcani Center, 50250, Bet Dagan, Israel aut Freeman Stanley Department of Plant Pathology, ARO, The Volcani Center, 50250, Bet Dagan, Israel aut Rav-David Dalia Department of Plant Pathology, ARO, The Volcani Center, 50250, Bet Dagan, Israel aut Nitzani Yehuda Department of Plant Pathology, ARO, The Volcani Center, 50250, Bet Dagan, Israel aut Sztejnberg Abraham Department of Plant Pathology and Microbiology, Faculty of Agricultural Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, 76100, Rehovot, Israel aut Pertot Ilaria SafeCrop Center, Istituto Agrario di San Michele all'Adige, Via Mach 1, 38010, S. Michele, TN, Italy aut Elad Yigal Department of Plant Pathology, ARO, The Volcani Center, 50250, Bet Dagan, Israel aut European Journal of Plant Pathology Kluwer Academic Publishers 114/3(2006-03-01), 283-292 0929-1873 114:3<283 2006 114 10658 https://doi.org/10.1007/s10658-005-5804-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10658-005-5804-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Amsalem Liat Department of Plant Pathology, ARO, The Volcani Center, 50250, Bet Dagan, Israel aut NATIONALLICENCE 700 1- Freeman Stanley Department of Plant Pathology, ARO, The Volcani Center, 50250, Bet Dagan, Israel aut NATIONALLICENCE 700 1- Rav-David Dalia Department of Plant Pathology, ARO, The Volcani Center, 50250, Bet Dagan, Israel aut NATIONALLICENCE 700 1- Nitzani Yehuda Department of Plant Pathology, ARO, The Volcani Center, 50250, Bet Dagan, Israel aut NATIONALLICENCE 700 1- Sztejnberg Abraham Department of Plant Pathology and Microbiology, Faculty of Agricultural Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, 76100, Rehovot, Israel aut NATIONALLICENCE 700 1- Pertot Ilaria SafeCrop Center, Istituto Agrario di San Michele all'Adige, Via Mach 1, 38010, S. Michele, TN, Italy aut NATIONALLICENCE 700 1- Elad Yigal Department of Plant Pathology, ARO, The Volcani Center, 50250, Bet Dagan, Israel aut NATIONALLICENCE 773 0- European Journal of Plant Pathology Kluwer Academic Publishers 114/3(2006-03-01), 283-292 0929-1873 114:3<283 2006 114 10658 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer