What to inspect
Compare old and new leaves, vine sections, moisture, drainage, roots, and nearby light before feeding.
Choose one evidence-based action
Remove only fully spent leaves and correct one confirmed cause. Watch the next node and new growth for improvement.
What not to do
Do not diagnose yellow leaves from one mark, change several major conditions at once, or use an unlabeled treatment. Old damage may remain after the cause is corrected.
Review the outcome
Photograph the same area under similar light, record the date and intervention, then compare the boundary of damage and the quality of new growth. Escalate rapid decline or safety concerns to an appropriate professional.