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Bunchy top morse code symptom

Caption:
The dark green dots and dashes along a leaf's veins and petiole are a reliable indicator of bunchy top, a disease caused by the banana bunchy top virus (BBTV). The so-called 'Morse code' symptom is best observed by holding the leaf to the light, with the underside of the leaf facing the observer.
Keywords:
BBTV, Bunchy top, Disease, Pests and diseases, Symptoms, Viral disease
Date shot:
August 2009
Country:
Hawaii, USA
Photographer:
Nelson, Scot / University of Hawaii