I bought and planted some 4' tall, bare root plum trees back in February of this year. All was looking good until I noticed some brown marks on the leaves of one tree. I sprayed with "ferti-lome" Triple Action Plus II. Now the leaves have a curling look and some are falling off the tree. The other 7 trees seem to be doing good. What is the likely problem and the fix?
Certified GKH Gardening Expert
Have you noticed any other signs of concern (i.e. insects)? It could be aphids affecting your plum tree resulting in the leaf curl. Neem oil should help with this and is an effective fungicide as well in case anything else pops up. Here is more information: https://www.gardeningknowhow.com/edible/fruits/plum/control-leaf-curl-plum-aphids.htm