|Eruption on a cedar (Juniperus virginiana) branch - Dr. Dailey O'Brien, Bugwood.org|
"Perennial, elongated swellings on the tips of twigs and branches, which may crack and form cankers, are symptoms of cedar quince rust on red cedars and other junipers. In damp spring weather, cushion-shaped, orange, gelatinous blisters burst through the bark where the branches are swollen. Cedar-quince rust disease damages the ornamental value of susceptible cedars and junipers, killing young branches and weakening plants when cankers occur on the main trunk."
|Infected hawthorn fruit - MO Bot Garden|
My lesson from this is to listen closely to my botanical betters when they send me clues, instead of shooting from the hip directly into my foot.