Thanks Brady for your comment as to why the symptoms of PLC are most likely due to the plum leaf curler aphid. So far my plum buds have been swelling since about two weeks with this mild winter. I have made two applications of Joe Reals recipe during our recent warm dry sunny days. I plan to alternate each week until flower buds open with his recipe and yours with the Castile soap hoping to prevent them this year.
Feb '18 https://growingfruit.org/t/safe-organic-control-of-peach-leaf-curl-and-other-fungal-diseases/14901?u=dennisd
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