Arboriculture & Urban Forestry 43(5): September 2017 193 Table 3. Success (%) of bark plug re-attachment in six tree species, 2, 4, 8, 16, 32, and 64 weeks after treatment after orientating the plugs at 0, 90, 180, and 270 degrees to their original position (n = 10 for each treatment). Weeks 2 4 8, 16, 32, 64 Pinus radiata 0 15 15 0 90 0 0 0 Quercus robur 0 90 2 4 8 16, 32, 64 38.5 20 38.5 20 38.5 0 18 0 180 0 0 0 180 22.2 19.4 16.7 8.3 270 degrees 0 0 0 270 degrees 35.1 21.6 2.7 2.7 Banksia integrifolia 0 90 77.5 40 72.5 32.5 72.5 32.5 50 90 25 180 65 47.5 47.5 Acacia dealbata 0 37.5 15 37.5 15 37.5 15 180 35 17.5 270 degrees 52.5 27.5 27.5 270 degrees 32.5 32.5 12.5 15 12.5 5 Platanus × acerifolia 0 90 21.6 0 21.6 0 21.6 0 75 50 50 50 90 25 180 270 degrees 23.5 25 23.5 20 23.5 20 Eucalyptus viminalis 0 180 80 2.5 2.5 2.5 35 20 20 270 degrees 30 5 5 5 Table 4. Success (%) of bark plug re-attachment, 2, 4, 8, 16, 32, and 64 weeks after treatment after orientating the plugs at 0, 90, 180, and 270 degrees to their original position in winter, spring, summer, and autumn (n = 10 for each treatment). Weeks 2 4 8 16, 32, 64 Winter 0 36.67 33.33 33.33 33.33 Summer 0 2 4 8 16, 32, 64 48.33 33.33 33.33 33.33 90 13.33 8.33 8.33 8.33 90 1.67 1.67 1.67 1.67 180 30 18.33 15 15 180 38.33 18.33 18.33 16.67 270 degrees 20 15 15 15 270 degrees 20 15 15 15 Spring 0 70 56.67 48.33 35 Autumn 0 13.33 8.33 8.33 1.67 90 45 28.33 15 15 90 28.3 20 16.67 16.67 180 50 33.33 25 20 180 33.33 8.33 8.33 1.67 270 degrees 55 40 16.67 16.67 270 degrees 13.33 8.33 8.33 1.67 Table 5. Success (%) of bark plug re-attachment in six tree species 2, 4, 8, 16, 32, and 64 weeks after treatment after orientating in winter, spring, summer, and autumn (n = 10 for each treatment). Weeks 2 4 8, 16, 32, 64 Pinus radiata Win 0 Spr 0 0 15.0 15.0 0 2 4 8 16, 32, 64 Quercus robur Win 10.0 Spr 10.0 10.0 10.0 70.0 67.5 27.5 0 Sum Aut 0 0 0 0 0 0 Sum Aut 10.0 20 10.0 10.0 10.0 7.5 7.5 7.5 Banksia integrifolia Win 52.5 Spr 45.0 45.0 87.5 87.5 87.5 Acacia dealbata Win 10.0 Spr 10.0 10.0 10.0 Autumn was the least likely season for suc- cess for deciduous species; however, successful re-attachment could be achieved in all seasons. Logarithmic regression analysis of the data at weeks 2 and 32 showed (Table 6) that there were no significant differences for the interac- tion of season, plug orientation, and species except for week 2 data for summer and autumn where P < 0.05. However, there were signifi- 62.5 27.5 10.0 10.0 Sum 10.0 7.5 7.5 Sum 27.5 22.5 22.5 22.5 Aut 85.0 40.0 40.0 Aut 42.5 42.5 37.5 17.5 Platanus × acerifolia Win 0 Spr 0 0 2.50 2.50 2.50 Spr Sum 62.5 57.5 57.5 Eucalyptus viminalis Win 57.5 35.0 30.0 30.0 90.0 40.0 30.0 30.0 Sum 52.5 7.5 7.5 5.0 Aut 0 0 0 Aut 10.0 10.0 10.0 10.0 cant differences (P < 0.05) when orientation and species were considered for the different seasons for weeks 2 and 32. There were also significant differences for orientation, except for spring, where the P values were slightly greater than 0.05 for both week 2 and 32. There were significant differences for all seasons for all species with P < 0.05 for both data sets. ©2017 International Society of Arboriculture
September 2017
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