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Pierce’s disorder (PD) of grapevine (Vitis vinifera) is attributable to the bacterium Xylella fastidiosa which is vectored by xylem sap-sucking insects, Whilst Grapevine Purple Blotch Virus (GRBV) brings about Pink Blotch Illness and is particularly transmitted during the laboratory by alfalfa leafhopper Spissistilus festinus. The significance of