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Pierce’s illness (PD) of grapevine (Vitis vinifera) is due to the bacterium Xylella fastidiosa and is vectored by xylem sap-sucking insects, whereas Grapevine Red Blotch Virus (GRBV) brings about Crimson Blotch Condition and is particularly transmitted in the laboratory by alfalfa leafhopper Spissistilus festinus. The importance of anthocyanin ac