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Pierce’s condition (PD) of grapevine (Vitis vinifera) is a result of the bacterium Xylella fastidiosa and is also vectored by xylem sap-sucking insects, Whilst Grapevine Red Blotch Virus (GRBV) results in Pink Blotch Sickness and it is transmitted while in the laboratory by alfalfa leafhopper Spissistilus festinus. The importance of anthocyanin a