Two trees with quick decline due to <i>Citrus tristeza virus.</i>  The tree on the left is in an advanced stage of decline and the tree on the right is in the early stages of decline.
Two trees with quick decline due to Citrus tristeza virus. The tree on the left is in an advanced stage of decline and the tree on the right is in the early stages of decline.
Credit: Elizabeth E. Grafton-Cardwell