Performance of a Leaf-Galling Phylloxera (Daktulosphaira vitifoliae) on Roots of Diverse Vitis spp. Rootstocks in North East Victoria, Australia

Background and Aims. Grape phylloxera in Australia comprises diverse genetic strains that feed on roots leaves of Vitis spp. The G38 strain was detected spp., for the first time North East Victoria 2015. Prior to 2015, only known leaves. aim this study evaluate survival development under field, controlled laboratory, greenhouse conditions. Methods Results. In emergence traps quantified instars alates emerging from rootstocks vinifera L. High numbers were collected placed at vines 101-14, 3309 Courderc Schwarzmann. Nodosity also observed Schwarzmann field in-pot experiments. better performance these three compared V. potted parallelled excised Conclusions. relatively high suggest a susceptible response could be associated with rootstock parentage. Further investigation is warranted determine implications development. Significance Study. These findings are fundamental decision-making risk assessment selection. reaffirms need triphasic (in vitro, planta, in-field) screening protocols phylloxera.