ISHS Acta Horticulturae 733: III International Grapevine Phylloxera Symposium
SCREENING FOR ROOTSTOCK RESISTANCE TO GRAPEVINE PHYLLOXERA GENOTYPES FROM AUSTRALIAN VINEYARDS UNDER CONTROLLED CONDITIONS |
| Authors: | G.A. Korosi, C.J. Trethowan, K.S. Powell |
| Keywords: | Daktulosphaira vitifoliae, Schwarzmann, Ramsey, glasshouse trial, tuberosity, performance |
| Abstract:
Quarantine and use of resistant rootstocks are the two long-term options for phylloxera management in Australia. However, in Australia, there are 83 known phylloxera genotypic classes identified. Performance of some strains are known to differ on both Vitis vinifera and ‘resistant’ rootstocks of Vitis parentage. There are over 20 different rootstocks of American parentage readily available for growers to choose from and these require testing against phylloxera clonal lineages. In this study, the performance of three phylloxera clonal lineages was assessed under glasshouse conditions on two rootstocks (Ramsey and Schwarzmann) and compared with self-grafted V. vinifera. V. vinifera showed least resistance to phylloxera genotypes. The G4 clone was significantly more virulent on V. vinifera than the G20 clone after ten weeks of infestation. Development on Schwarzmann and Ramsey did not differ significantly for any of the phylloxera clones. On V. vinifera, significantly more tuberosities developed, which were highly necrotic compared to the non-necrotic root swellings formed on other rootstocks. | |
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