Crown gall
July 6, 2015
Bacterial diseases
Pathogen
Agrobacterium tumifaciens.
Hosts include
Achillea, Anemone, Artemisia, Aster, Campanula, Coreopsis, Delphinium, Dianthus, Gaillardia, Geranium, Gypsophilia, Helianthus, Heuchera, Lathyrus, Nepeta, Oeno-thera, Penstemon, Phlox, Platycodon, Primula, Rudbeckia, Salvia, Scabiosa, Sedum and Stachys.
Symptoms
Galls form on stems and roots, restricting shoot or root growth.
Spread
This bacterium persists in soil; use of infested field soil can spread the disease. Moving infested plants also spreads disease. Cuttings taken from infected plants are likely to become infected.
Management
Plants with galls should be removed and destroyed: they cannot be successfully treated. Infection usually occurs through wounds. Good sanitation is important during vegetative propagation. Effective biological control products are available and can be used to protect especially susceptible plants.
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