"Cedar - Apple Rust"

Cedar - Apple Rust fungus. Cedar-apple rust is a disease requiring both an apple and cedar or juniper tree to complete its life cycle. On the cedar, (shown here) the fungus grows up to golf-ball size on young twigs. During wet weather these growths swell and begin to push out bright orange gelatinous spikes. Wind carries fungal spores from these spikes to susceptible apple or crabapple trees to complete the cycle.