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To facilitate development of  Prunus  L. rootstocks with desirable agronomic traits, domesticated peach ( Prunus persica ) and almond ( P. dulcis ) were crossed with wild almond relatives. This work reports that a hybrid from a  P. webbii  ×  P. persica  cv. Harrow Blood cross is susceptible to almond leaf scorch disease (ALSD). ALSD is caused by the fastidious, xylem-limited bacterium  Xylella fastidiosa . The  P. webbii  × ‘Harrow Blood’ hybrid, along with its parents, was inoculated with two ALSD-inducing strains ( X. fastidiosa  subsp.  fastidiosa  strain M23 and subsp.  multiplex  strain Dixon). Both  X. fastidiosa  strains grew to high titer in the susceptible  P. webbii  parent and in the interspecific hybrid; defoliation was also observed. As expected, ‘Harrow Blood’ did not exhibit defoliation symptoms or support growth of  X. fastidiosa . This result contrasts with earlier work demonstrating that a  P. persica  ×  P. dulcis  hybrid is not a suitable host for  X. fastidiosa  subsp.  fastidiosa  M23. It appears that the genetic basis of resistance/susceptibility differs between a  P. persica  ×  P. dulcis  cross and the  P. webbii × P. persica  cross reported here. Understanding the degree of susceptibility to  X. fastidiosa  in complex hybrids of subgenus  Amygdalus  should be an important part of rootstock development.

Susceptibility to Xylella fastidiosa in a First-generation Hybrid from a non-traditional Peach–Almond Cross