Willow Sawfly Management Trials - Weeds Australia

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Willow Sawfly Management Trials - Weeds Australia

30Key Points: Willow sawfly population levels and extent of tree defoliation were monitored onwillows of various taxa at nine sites across Victoria throughout the 2009/10 season; After maintaining low population levels at Happy Valley Creek for three seasons,willow sawfly numbers exploded in 2009/10, resulting in extensive tree defoliation; Population levels at four other sites remained low, while levels decreased from high tolow at two sites, and remained high at two sites in 2009/10 in comparison with 2008/09; Tree defoliation occurred at Everton, Happy Valley and Kergunyah, with the mostextensive defoliation occurring approximately a month after a peak in population levels; Two grey sallow plants were extensively defoliated by willow sawfly at Happy Valley; The ratio of live: dead material on willow trees decreased slightly at Kiewa in 2009, butwillow sawfly does not yet appear to have killed any willow trees in Victoria.Defoliation of grey sallow atHappy Valley January 2010.Photo: DPI Victoria

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