I have an apple tree in my yard that was planted last year, and its leaves have a number of yellow spots on them. These yellow spots that have slimy red-orange centers. Based on the pictures that I have seen, this looks a lot like Cedar-Apple rust.
I've looked for treatment options, and most places recommend something called Immunox, applied once every 10 days or so. However, these websites also mention that treatments should start when the tree blooms. My tree bloomed a long time ago, and I didn't see the spots until last week. Will applying the fungicide still work? Is there something else I should be doing?