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In 1997 citrus greening disease (CGD) and its psyllid vector were observed in citrus in Punjab and Peshawar. Typical symptoms (yellow veins) of citrus greening caused severe leaf drop and trunk dieback with the resultant death of some trees. Leaf mottling was the prominent characteristic for field diagnosis. Variability in disease severity and incidence was observed in citrus cultivars at different locations. Diagnostic tests using light microscopy of thin sections stained with phenolic thionin and orange G combination revealed abnormalities in infected phloem tissues.