Clear, colorless veins on slightly chlorotic citrus leaves infected with Citrus tristeza virus.

Tristeza damage to a potted Mexican lime citrus indicator plant (labeled CTEA 450-2:5060 1-8-2007) inside a quarantine greenhouse of the National Clonal Germplasm Repository for Citrus and Dates, USDA UCR, Riverside Co. Credit: David Rosen
Credit: David Rosen