Looks like Plum leaf curl aphid symptoms (but no actual aphids??)
Is there much I can do in June, and any helpful practical advice on the following quote...
"You can apply cultural methods to control leaf curl plum aphids. Use quick hard blasts of water to rinse off the insects. Limit nitrogen fertilizers, which force the formation of tip growth, one of the insect’s favorite plant parts. There are also several biological treatments in the form of natural predators. Lady beetles, green lacewings and syrphid fly larvae are another way to control plum aphids. If necessary, use dormant season chemical treatments of horticultural oil. Severe aphid infestations require growing season applications of a leaf curl plum aphid treatment such as neem oil, imidacloprid, pyrethrins or non-toxic insecticidal soap."
Read more at Gardening Know How: Controlling Leaf Curl Plum Aphids – Leaf Curl Plum Aphid Treatment And Prevention
https://www.gardeningknowhow.com/edible/fruits/plum/control-leaf-curl-plum-aphids.htm
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