New Zealand Journal of Crop and Horticultural Science abstracts

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Pathogenicity and relative virulence of 11 Greek Phytophthora species on apple and pear rootstocks

T. Thomidis
C. Tsipouridis
J. Cullum

National Agricultural Research Foundation
Pomology Institute
Naoussa, P.C. 59200, Greece
email: tomgr@otenet.gr

Abstract   The pathogenicity and virulence of 11 Phytophthora spp. isolated from various host plants were examined on an apple (Malus domestica Borkh.) (MM106) and a pear (Pyrus communis L.) (O.H.F. 333) rootstock. Only P. cactorum and P. citricola isolates were pathogenic to these rootstocks. The isolates of P. cactorum were the most aggressive. The severe crown rot caused by isolates of P. cactorum and P. citricola suggests that these pathogens pose a potential threat to apple and pear orchards. P. citrophthora, P. boehmeriae, P. erythroseptica, P. capsici, P. cryptogea, P. drechsleri, P. cambivora, P. palmivora, and P. parasitica, isolated from various hosts, were not pathogenic to MM106 and O.H.F. rootstocks, suggesting that these pathogens may not be a serious threat to apple and pear trees grafted on these rootstocks.

Keywords   crown rot; pathogenicity; Phytophthora; virulence

H02029 Received 19 April 2002; accepted 16 October 2002; published 9 December 2002
New Zealand Journal of Crop and Horticultural Science, 2002, Vol. 30: 261-264
0014-0671/02/3004-0261 $7.00 © The Royal Society of New Zealand 2002

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