When plants are systemically infected, leaf wilt and plant death occur. Leaves can have a wedge-shaped necrotic area which is confined between leaf veins. Roots will appear healthy in those plants unlike plants infected with either Pythium or Verticillium. Infected ivy geraniums do not exhibit the same type of symptoms as zonal geraniums. Ivy geraniums may show symptoms similar to nutrient deficiency or mite damage.
Leaves become necrotic with or without wedge-shaped sections.
A laboratory analysis is critical for an accurate diagnosis. The pathogen is spread by contaminated cutting knives, overhead water application and employees' hands. White flies and other insects also can spread the bacterium in the greenhouse. The most common method of inoculation comes from contaminated stock plants from which cuttings are taken. Surfaces directly in contact with the cutting or production of geraniums should be thoroughly sanitized prior to propagation or planting.