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1 March 2012 Short communication: Tolerance of Vineland apple rootstocks to waterlogging and Phytophthora infestation
Cheryl R. Hampson, Paul Randall, Peter Sholberg
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Hampson, C. R., Randall, P. and Sholberg, P. 2012. Short communication:Tolerance of Vineland apple rootstocks to waterlogging andPhytophthorainfestation. Can. J. Plant Sci. 92: 267-269. The Vineland (V) apple (Malus) rootstock series has displayed a range of dwarfing potential and fire blight resistance in research test plots. Knowledge of their resistance to crown and root rot, incited by Phytophthora spp., is desirable before recommending them for on-farm testing, but information on this subject is lacking. Therefore, we tested the response of V.1, V.2, V.3 and V.4 clonal rootstocks to Phytophthora (P. cactorum and P. cryptogea) and waterlogging (0, 24 or 48 h per week for 4 mo) in a factorial greenhouse experiment on potted plants, using M.9 (moderately resistant to Phytophthora) and MM.106 (susceptible) as standards for comparison. Root fresh weight was reduced equally by both pathogens relative to uninoculated controls; rootstocks differed in their response to flooding but not to pathogen treatment. Shoot fresh weight was depressed by flooding in a rootstock- and pathogen-dependent manner. In general, all four V rootstocks had better root and shoot growth than MM.106 in the flooding treatments, and all grew as well as, or better than M.9.

Cheryl R. Hampson, Paul Randall, and Peter Sholberg "Short communication: Tolerance of Vineland apple rootstocks to waterlogging and Phytophthora infestation," Canadian Journal of Plant Science 92(2), 267-269, (1 March 2012).
Received: 8 July 2011; Accepted: 1 November 2011; Published: 1 March 2012

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Crown rot
flooding tolerance
Pourriture du collet
Root rot
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