There isn't really a feature here called "Ask Douglas Justice", as Douglas reads all the postings anyway, but Joseph Lin sent Douglas one email with several unrelated questions, and the replies were interesting enough that I'm copying them here, and I wanted a title that indicated that these were educational tidbits and they're not my own. [I'll have to get Joseph to post the photos - I seem to have deleted the original email]. Q: Why are there some 'witch's broom(?) with many branches and leaves' on Avium Plena as attached photos? Reply from Douglas: The cherry witches broom disease is caused by Taphrina wiesneri, a fungal pathogen that causes a disease similar to the peach leaf curl (also a Taphrina species). It is not very common, but some cultivars, e.g., 'Somei-yoshino' seem to have it more than others. I suspect infection is also related to the age of the cherry. I have also seen it on 'Ukon' here on campus.