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Pierce’s condition (PD) of grapevine (Vitis vinifera) is because of the bacterium Xylella fastidiosa which is vectored by xylem sap-sucking insects, While Grapevine Purple Blotch Virus (GRBV) causes Red Blotch Illness and it is transmitted from the laboratory by alfalfa leafhopper Spissistilus festinus. The importance of anthocyanin accumulations