A detached leaf bioassay to screen Durian cultivars for susceptibility to Phytophthora palmivora

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Contents Vol 34(2)

doi:10.1071/AP05005

A detached leaf bioassay to screen Durian cultivars for susceptibility to Phytophthora palmivora

L. L. Vawdrey ^A ^C, T. M. Martin ^A, J. De Faveri ^B

^A Department of Primary Industries and Fisheries, Centre for Wet Tropics Agriculture, South Johnstone, Qld 4859, Australia.
^B Department of Primary Industries and Fisheries, Centre for Tropical Agriculture, Mareeba, Qld 4880, Australia.
^C Corresponding author. Email: lynton.vawdrey@dpi.qld.gov.au





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Australasian Plant Pathology 34(2) 251–253 http://dx.doi.org/10.1071/AP05005
Submitted: 5 August 2004 Accepted: 8 October 2004 Published online: 22 June 2005

Abstract

A detached-leaf bioassay was developed and used to screen five durian (Durio zibethinus) cultivars against Phytophthora palmivora isolates from a trunk canker, root and fruit. The fruit isolate was less aggressive than the canker and root isolates. The bioassay using the canker isolate was later used to determine the variation in resistance of D. macarantha and nineteen cultivars of D. zibethinus. The cultivars displayed a range of responses with Parung and Gob being most tolerant, with Gaan Yaow, Chanee and Penang 88 being susceptible. The remaining germplasm fell between Gaan Yaow and Penang 88 in susceptibility. The leaf bioassay was found to be a rapid and reliable method for assessing the susceptibility of durian cultivars.

Keywords: root rot, trunk canker, fruit rot, cultivars, oomycete.