Can pruning help maintain vitality of ash trees affected by ash dieback in urban landscapes? |
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| Institution: | 1. Institute of Forestry Lithuanian Research Centre for Agriculture and Forestry, Liepu Str. 1, LT-53101 Girionys, Kaunas Distr., Lithuania;2. Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden;3. Kharkiv State Zooveterinary Academy, Ukraine;4. Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, Alnarp, Sweden;1. Uppsala BioCenter, Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden;2. Department of Natural Sciences, Mid Sweden University, SE-85170 Sundsvall, Sweden;1. Dept. Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, P.O. Box 7026, SE 750 07 Uppsala, Sweden;2. Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, P.O. Box 49, SE 230 53 Alnarp, Sweden;3. Chaire industrielle CRSNG-UQAT-UQAM en aménagement forestier durable, Université du Québec en Abitibi-Témiscamingue, 445 boulevard de l’Université, Rouyn-Noranda, Québec J9X 5E4, Canada;1. iuFOR-EiFAB, Campus Duques de Soria, Universidad de Valladolid, 42004 Soria, Spain;2. XenFor Lab, Misión Biológica de Galicia, MBG-CSIC, Apdo. 28, 36080 Pontevedra, Spain;3. Institute for Dehesa Research (INDEHESA), Faculty of Forestry, University of Extremadura, Avenida Virgen del Puerto 2, 10600 Plasencia, Spain;4. Departamento de Producción Vegetal, EPSE, Campus Terra, Universidade de Santiago de Compostela, 27002 Lugo, Spain;1. USDA Forest Service, Southern Research Station, Eastern Forest Environmental Threat Assessment Center, 3041 East Cornwallis Road, Research Triangle Park, NC 27709 USA;2. North Carolina State University, Department of Forestry and Environmental Resources, 3041 East Cornwallis Road, Research Triangle Park, NC 27709 USA;3. Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, 1219 Queen Street East, Sault Ste. Marie, ON P6A 2E5 Canada;4. Virginia Tech, Department of Forest Resources and Environmental Conservation, 228 Cheatham Hall, 310 West Campus Drive, Blacksburg, VA 24061 USA;5. Cornell University, Horticulture Section, School of Integrative Plant Science, Ithaca, NY 14853 USA;1. Department of Innovation in Biological Systems, Food and Forestry (DIBAF) – University of Tuscia, 01100, Viterbo, Italy;2. Department of Agriculture and Forest Science (DAFNE) – University of Tuscia, 01100, Viterbo, Italy |
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| Abstract: | Hymenoscyphus fraxineus causes a destructive invasive tree disease known as ash dieback threatening the survival of common ash not only in the forests, but also in urban and landscape settings. Pruning is a potential management practice that could help maintain tree vitality and aesthetics in parks, gardens, alleys and recreation areas, as well as maintaining veteran trees having high heritage or cultural value, or trees with high genetic importance (e.g. located in clonal seed orchards). In this study we investigated the maximum distance proximal to the lesion margin at which H. fraxineus can be detected on individual branches infected by the fungus in order to provide recommendations for pruning. Pruning of branches was carried out on 38 trees in southern Sweden. Tissue samples including bark and wood were collected from the margin of the lesion and at 5 cm intervals proximal to the lesion. Molecular analysis revealed presence of H. fraxineus in 91.3% of the investigated lesions. The proportion of lesions at which H. fraxineus could be detected declined with increasing distance from the lesion margin, with a significant reduction in the number of positive samples at 10 cm proximal to the margin. At 30 cm from the lesion edge the pathogen was never detected. Our results suggest that routine pruning may help maintain the vitality of younger trees. Pruning branches at least 35 cm from visible, active lesions in the bark should exclude the fungus and therefore reduce the probability of stem infection by H. fraxineus, however this cultural control tactic may only be economically feasible for high value amenity trees. |
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| Keywords: | Common ash Ash dieback Pruning |
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