Crataegus douglasii

Genus-level evidence

2 claims where the source named the organism only at the genus or collective level (e.g. Crataegus sp.) and did not determine the species. Listed separately because they apply to the genus, not specifically to Crataegus douglasii.

• herbivory · Eriosoma lanigerum → Crataegus spp. · effect: harmful

  “is found on apple, elm, mountain ash, pear, and hawthorn”

  Pedigo L.P., Rice M.E. (2009) · Entomology and Pest Management, Fourth Edition · p. 443 #6493451
• pathogen pressure · Gymnosporangium spp. → Crataegus spp. · effect: harmful

  “Similar diseases affect hawthorn and quince”

  Unknown (Unknown) · History of Plant Pathology and Early Significant Plant Diseases (Chapter 1 Introduction) · p. 574 #6494411