My cedar tree has developed numerous, hard green balls in the interior of the tree. What are they?
These balls are cedar apples, galls which form on Juniper branches caused by any of several rust fungi. The galls turn reddish brown in spring and liberate fungal spores which can cause considerable damage on neighboring, susceptible apples, crabapples, quince and hawthorns. Protect by applications of suitable fungicides beginning about the time of apple petal drop. Cedar apple rust is the best known of these fungal diseases; plant only rust resistant apple varieties.
