RAPRA

Risk Analysis for Phytophthora ramorum : Objectives

DISTRIBUTION: Population structure of European and American lineages

Table showing summary of adaptive differences between European 1 and North American 1
molecular lineages of P. ramorum
(data from Brasier & Kirk 2004 and Brasier, Kirk and Rose 2006)

Character	Lineage
Character	European 1	North American 1
Growth temperature response curve between 12 - 27°C	Similar Curve
Mean growth rate between 12 - 27°C	Faster over all	Slower over all
Mean growth rate 20°C mm day¯¹	significantly faster: ca 3.6	slower: ca 2.7
Growth rate variation 20°C	small variance	large variance
Colony pattern	uniform wild type	wild types and unstable non wild types
Developmental instability	limited instability	marked instability
Mean pathogenicity (lesion area in phloem of Quercus rubra) 20°C	significantly (ca 20-30%) higher	ca 20-30% lower
Host range (30+ hosts)	similar
Sexual compatibility type	predominantly A1; A2 rare	A2

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