Informational table showing disease name, symptoms, pathogen/cause, and management of Pyracantha diseases. Disease Symptoms Pathogen/Cause Management Dieback and canker Leaves wilt and die as branches are slowly killed. Small, sunken cankers slowly increase in size. The wood beneath the canker is discolored. Trees cankered near the base will die. Botryosphaeria Prune infected branches well below the canker. Remove severely infected trees. Protect trees from drought stress and winter injury.  Fire blight
  Twigs, branches, and leaders on shrubs wilt and blacken, especially during flowering. Affected twigs and branches may bend over into the shape of a shepherd’s crook. Blackened flower parts remain attached to the plant. Cream-colored liquid may ooze out of the cankers and run down the trunk and branches in the spring if conditions are very wet. No fungal fruiting structures are found in the cankers  Erwinia amylovora
  Pyracantha cultivars considered resistant include Mojave, Shawnee, and Yunan. Do not purchase or plant infected material. Remove severely infected plants. During dormancy when the weather is dry, prune infected branches, cutting at least 4 inches below the base of the canker. Disinfest pruning tools frequently.  Scab   Velvety, olive green spots can form on all plant parts. Leaves and fruit fall prematurely. Spilocaea pyracanthae (Fusicladium)   Plant resistant cultivars such as Bella, Duval, Flava, Firey Cascade, Government Red, Prostrata, Rutgers Shawnee, and Santa Cruz Prostrata. Avoid using sprinkler irrigation. Apply a fungicide in the spring and at regular intervals until the weather dries.

Scab on foliage and fruit.