Phytopathology (1996) 86, p. S64 (Jacobson et al.)

D.J. Jacobson and R.S. Ojerio (1996)
Host specificity of Albugo candida on wild crucifers from two geographic regions
Phytopathology 86 (11 suppl.), S64-S64
Abstract: White rust caused by Albugo candida (Ac) has been reported on over 200 crucifer species, however, host specificity has been examined on only a few of these hosts, predominately crop species. Nine isolates from five wild hosts from both Michigan and California were inoculated on eight wild and differential host species. Generally, Ac host preference was specific, even within genus. Erysimum menziesii ssp. eurekense was the only example of wide host susceptibility being susceptible to all isolates of A. candida. However, isolates of Ac from E. m. eurekense were not pathogenic on any other host tested, including E. repandum. Moreover, adaptation to the range of locally available hosts was not apparent. Coevolution of pathotype with host species was also not obvious. Phylogenies of both pathotypes and host species constructed from ribosomal DNA internal transcribed spacer (ITS) sequences lacked substantial evidence of congruence. ITS could not sufficiently distinguish all pathotypes examined, possibly masking congruence. Possible coevolution needs to be examined in more detail using additional markers with finer resolution.

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Albugo candida		U.S.A. (SW)
	Albugo candida		U.S.A. (NE)