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Pierce’s illness (PD) of grapevine (Vitis vinifera) is because of the bacterium Xylella fastidiosa and is particularly vectored by xylem sap-sucking insects, whereas Grapevine Red Blotch Virus (GRBV) results in Purple Blotch Ailment and is transmitted while in the laboratory by alfalfa leafhopper Spissistilus festinus. The importance of anthocyan