Arboriculture & Urban Forestry 47(3): May 2021 phytotoxic effects and pre-harvest management of gray mold disease on strawberry plants. Crop Protection. 30(10):1274- 1279. https://doi.org/10.1016/j.cropro.2011.05.021 Ivarsson K. 2011. Studies of environmental factors (temperature and relative humidity) effecting the development of pear rust (Gymnosporangium fuscum) and studies of control methods [master’s project]. Alnarp (Sweden): Swedish University of Agricultural Sciences, Horticulture and Agricultural Science Department of Plant Protection Biology. 30 p. https://stud .epsilon.slu.se/2131/1/ivarsson_k_110112.pdf Kalb T, Wiederholt K, Elhard C, Good J. 2011. Starting a com- munity orchard in North Dakota. 2011. NDSU Extension Publication H-1558. Bismarck (ND, USA): North Dakota Agricultural Experiment Station. 48 p. https://www.ag.ndsu .edu/publications/lawns-gardens-trees/starting-a-community -orchard-in-north-dakota/h-1558-starting-a-community -orchard-in-nd.pdf Kikuhara K, Iiyama K, Masaru M, Furuya N. 2019. First report on DMI fungicide resistance in Gymnosporangium asiaticum, the causal agent of Japanese pear rust, in Japan. Journal of General Plant Pathology. 85:49-56. https://doi.org/10.1007/ s10327-018-0820-5 King A, Clifford S. 2008. Community orchards handbook. Dorset (UK): Common Ground Publishing. Lichtenthaler HK, Wellburn AR. 1983. Determinations of total carotenoids and chlorophylls a and b of leaf extracts in dif- ferent solvents. Biochemical Society Transactions. 11(5): 591-593. https://doi.org/10.1042/bst0110591 Mueller DS, Hung YC, Oetting RD, van Iersel MW, Buck JW. 2003. Evaluation of electrolyzed oxidizing water for manage- ment of powdery mildew on gerbera daisy. Plant Disease. 87(8):965-969. https://doi.org/10.1094/PDIS.2003.87.8.965 Naqvi SAMH. 2004. Diseases of fruits and vegetables: Diagnosis and management. Volume 1. Dordrecht (The Netherlands): Springer. 692 p. https://doi.org/ 10.1007/1-4020-2606-4 Ormrod DJ, O’Reilly HJ, van der Kamp BJ, Borno C. 1984. Epidemiology, cultivar susceptibility, and chemical control of Gymnosporangium fuscum in British Columbia. Canadian Journal of Plant Pathology. 6(1):63-70. https://doi.org/10.1080/ 07060668409501592 Patocchi A, Bigler B, Koller B, Kellerhals M, Gessler C. 2004. Vr2 Genetics. 109:1087-1092. https://doi.org/10.1007/s00122- 004 -1723-8 Percival GC. 2018. Evaluation of silicon fertilizers and a resistance inducing agent for control of apple and pear scab under field conditions. Arboriculture & Urban Forestry. 44(5):205-214. Rahman MA, Armson D, Ennos AR. 2014. Effect of urbanization and climate change in the rooting zone on the growth and physiology of Pyrus calleryana. Urban Forestry & Urban Greening. 13(2):325-335. https://doi.org/10.1016/j.ufug.2013 .10.004 Rahman MA, Smith JG, Stringer P, Ennos AR. 2011. Effect of rooting conditions on the growth and cooling ability of Pyrus calleryana. Urban Forestry & Urban Greening. 10(3):185-192. https://doi.org/10.1016/j.ufug.2011.05.003 Santamour FS, McArdle AJ. 1983. Checklist of cultivars of callery : A new apple scab resistance gene. Theoretical and Applied 121 pear (Pyrus calleryana). Journal of Arboriculture. 9(4):114-116. Swait AAJ, Butt DJ. 1990. Fungicides as antisporulants against apple powdery mildew and scab. Tests of agrochemicals and cultivars, 11. Wellesbourne (UK): Association of Applied Biologists. Tytherleigh A. 2008. Soil sampling for habitat recreation and restoration. Worcester (UK): Natural England. Natural England Technical Information Note TIN035. 3 p. http://publications .naturalengland.org.uk/publication/31015 Yun HY, Rossman AY, Byrne J. 2009. First report of Gymnospo- rangium sabinae, European pear rust, on Bradford pear in Michigan. Plant Disease. 93(8):841-841. https://doi.org/10 .1094/PDIS-93-8-0841A ACKNOWLEDGMENTS The author is grateful for funding in part from the TREE FUND (Hyland Johns Grant 16-HJ-02) and an Innovative Growers Grant. The author would like to thank Mr. Anthony Little and staff at Aston Manor for organizing the spray treatments and fruit harvests. Glynn C. Percival (corresponding author) Bartlett Tree Research Laboratory Cut Bush Lane East Reading University Shinfield, Reading, UK
[email protected] Conflicts of Interest: The author reported no conflicts of interest. Résumé. La rouille du poirier est un agent pathogène foliaire des poiriers ornementaux et fruitiers. Sans son contrôle, les pertes de rendement et d’esthétique peuvent être importantes. La dépendance excessive à l’égard des fongicides synthétiques signifie que de nouveaux moyens de gestion des agents pathogènes sont néces- saires. Des essais sur le terrain ont été menés en utilisant le poirier (Pyrus cv. Conference) pour évaluer l’efficacité de l’eau combu- rante électrolysée (ECE) comme composé contre la rouille. Un programme de pulvérisation du fongicide synthétique (boscalid + pyraclostrobine) utilisé pour la gestion de la rouille du poirier a été inclus sur une base comparative. Chaque traitement a été appliqué quatre fois avant l’apparition observée de la rouille (d’avril à juin, c’est-à-dire à titre préventif). Des études furent menées en 2017 puis répétées en 2018. L’efficacité de l’eau com- burante électrolysée comme composé antirouille a été confirmée (augmentation de la teneur en chlorophylle des feuilles, réduction de l’incidence et de la sévérité de l’atteinte par la rouille des feuilles). Le degré de protection acquis contre la rouille des feuilles n’était pas statistiquement différent du programme de pulvérisation de boscalid + pyraclostrobine. Les résultats sug- gèrent que quatre applications par pulvérisation d’eau combu- rante électrolysée constituent un complément utile aux méthodes existantes de lutte contre la rouille du poirier dans des conditions de terrain et qui peuvent également s’appliquer à d’autres agents pathogènes foliaires. ©2021 International Society of Arboriculture
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