Pathogenic bacterial disease effecting many fruit bearing trees, dispersing through the tree’s vascular system
Threat to Trees
Moderate to Severe
Sporadic but severe bacterial oozing cankers which remain present indefinitely after contamination
Honeybees and other insects attracted by bacterial ooze can transmit bacterium. Splashing rain, wind and contaminated pruning tools are also cause.
Signs & Symptoms
Dark, watery, oozing cankers on branches, twigs, and trunk. Cankers are often small and difficult to notice. Fruit loss or discoloration occurs relative to disease severity. Open flowers are often the most common infection site, and often appear blackened. Occasionally, branches and twigs will become blackened, giving the tree a scorched or “fire” appearance.
Bacteria overwinters in blighted branches at the edge of cankers, then rapidly multiplies in temperate weather. Bacteria is forced through cracks and bark pores, killing the cambial tissue of branches, flowers, and fruit above the girdled area.
North America, spreading to most of the world with the believed exception of Australia
Heavy Northeast presence, but found throughout US