Whats growing on my crab apple tree's leaf? This is the only leaf me and my family saw it on. The tree sits in a small circle of mulch in the ground of our backyard, watered mostly by the rain. Our tree is only about 2-3 years old and gets consistent sunlight. My dad just sprayed it with some kind of anti-fungal spray but im not sure what brand or how much. If it helps at all, there was a PLETHORA of baby aphids. We had to pick off the ends of the branches. Not sure if thats related or a totally separate problem. More curious than anything! Hope our little tree isnt in too much trouble. Originally by u/ivyjiro on Reddit: https://tinyurl.com/2c4p9l8w