Willow Sawfly Management Trials - Weeds Australia

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Willow Sawfly Management Trials - Weeds Australia

10Table 2: Survival of Tube-Stock Planted at Three Trial Sites in Winter 2008Site and Species Common Name Survival atApril 2009Survival atApril 2010Happy ValleyEucalyptus camaldulensis river red gum 80% 68%Acacia dealbata silver wattle 89% 75%Acacia melanoxylon blackwood 94% 94%Callistemon sieberi river bottlebrush 96% 89%Melicytus dentatus tree violet 73% 53%Kunzea ericoides burgan 94% 81%Overall Survival: 88% 78%Kiewa RiverEucalyptus camaldulensis river red gum 100% 100%Acacia dealbata silver wattle 98% 96%Acacia melanoxylon blackwood 93% 93%Callistemon sieberi river bottlebrush 100% 98%Melicytus dentatus tree violet 93% 86%Bursaria spinosa sweet bursaria 95% 86%Overall Survival: 97% 94%Campaspe RiverEucalyptus ovata swamp gum 89% 83%Eucalyptus viminalis manna gum 87% 71%Acacia dealbata silver wattle 77% 57%Acacia melanoxylon blackwood 90% 85%Acacia retinodes wirilda 96% 79%Carex appressa tall sedge 56% 56%Overall Survival: 84% 73%1.3.3 Plant Growth (Tube-stock)1.3.3.1 Happy Valley SiteThose plants which were closest to the river were flooded on one or two occasions in spring andearly summer 2009, indicating that the site was not moisture limited early in the season.Plants at this site had been severely affected by browsing in the 2008/09 season and averageplant heights had not increased for any species except blackwood (Ede et al. 2009). Browsingdamage was evident again in 2009/10, although it appeared to be occurring at a lower intensity.Weeds had grown up in the plots around the plants and in some cases, these weeds may haveprovided some protection against browsing, particularly the thistles.Despite this browsing, average plant heights did increase through the 2009/10 season (Table 3) asregrowth from browsed stems grew more strongly. For all species, average heights increased by

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