Barbara, Dez J., Roberts, A. L. and Xu, X.-M.. (2008) Virulence characteristics of apple scab (Venturia inaequalis) isolates from monoculture and mixed orchards. Plant Pathology, Vol.57 (No.3). pp. 552-561. ISSN 0032-0862

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Abstract

Isolates of Venturia inaequalis were sampled from monoculture and mixed orchards of three apple cultivars: Bramley, Cox and Worcester. In addition, single-ascospore progeny isolates were obtained from three crosses between pairs of isolates originating from the three cultivars in monoculture orchards. These field isolates and single-ascospore progenies were inoculated onto each of the three cultivars in a glasshouse. The patterns of infection showed that all three cultivars, commonly regarded as susceptible to scab, contained some specific resistance factors and that scab isolates from both mixed and monoculture orchards appeared to have co-evolved with cultivars. A much higher proportion of isolates from cv. Worcester in the mixed orchard were unable to infect any of the three cultivars than isolates from any other combination of cultivar and orchard type, but there was no other difference between isolates from mixed vs. monoculture orchards. Many isolates could infect both Bramley and Cox, or Cox and Worcester; but only a single isolate could infect both Bramley and Worcester. Results from the testing of 61 single-ascospore progeny isolates suggested that virulence towards Bramley, Cox and Worcester was controlled by at least one, two and three factors, respectively. Moreover, the exact nature of the interactions between these factors in determining virulence depended on the particular pair of isolates concerned.

Item Type:	Journal Article
Subjects:	Q Science > QH Natural history > QH301 Biology Q Science > QK Botany S Agriculture > SB Plant culture
Divisions:	Faculty of Science > Life Sciences (2010- ) Faculty of Science > Life Sciences (2010- ) > Warwick HRI (2004-2010)
Library of Congress Subject Headings (LCSH):	Ascospores, Coevolution, Apple scab, Apples -- Diseases and pests
Journal or Publication Title:	Plant Pathology
Publisher:	Wiley-Blackwell Publishing Ltd.
ISSN:	0032-0862
Official Date:	June 2008
Dates:	Date Event June 2008 Published
Volume:	Vol.57
Number:	No.3
Page Range:	pp. 552-561
Identification Number:	10.1111/j.1365-3059.2007.01781.x
Status:	Peer Reviewed
Access rights to Published version:	Restricted or Subscription Access
Funder:	Great Britain. Dept. for Environment, Food & Rural Affairs (DEFRA)
URI:	http://wrap.warwick.ac.uk/id/eprint/36895

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