Cherry just got checked.
The most likely cause is aphids on the tender leaves and shoots. The tiny black bugs plus sticky residue fit aphid honeydew, and aphids commonly make new leaves curl, twist, and look stressed while older growth stays fairly normal. This is a pest issue, not a nutrient problem.
Do this today
Start with the least disruptive control: physically remove the pests and protect the tender growth.
Also possible, but less likely
What would prove it
Escalate gently if needed
Use a horticultural soap or insecticidal soap on the leaf undersides, following the label closely. Avoid spraying open flowers and repeat only if fresh aphids reappear.
Turn this into a recovery case
One photo gives a diagnosis. Tracking proves whether the plant is recovering.
Don’t leave the diagnosis hanging 🌱
Save it now, then use the next photo to confirm if this was the right call.
Create account & save plant 🌱