Willow Sawfly Management Trials - Weeds Australia

weeds.org.au

Willow Sawfly Management Trials - Weeds Australia

18Key Points: Willow trees were defoliated by willow sawfly in 2008/09 and 2009/10 at the KiewaRiver trial site and at the Happy Valley trial site in 2009/10; There was no defoliation at the Campaspe River trial site; After two seasons, plant survival was >90% at Kiewa River and >70% at the other twosites; Growth of tube-stock was strong at Kiewa River for all species, with river red gum andsilver wattle plants more than 2 m tall, on average, at the end of the 2009/10 season; Browsing severely limited plant growth at the remaining two sites; There was no difference in plant survival or growth at any site between those seedlingsplanted under stem-injected trees and those planted under untreated trees; Seedling establishment was poor in plots which had been direct-seeded at both HappyValley and Campaspe River; Light levels were lower under untreated willows than stem-injected willows or thosedefoliated by willow sawfly; In the stem injection trial, it was found that trees which were treated about 6 weeks afterdefoliation by willow sawfly were killed by the herbicide application.Measuring dbh on silver wattle at Kiewa Site April 2010. Photo: DPI Victoria

More magazines by this user
Similar magazines