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Pierce’s disorder (PD) of grapevine (Vitis vinifera) is a result of the bacterium Xylella fastidiosa which is vectored by xylem sap-sucking insects, Whilst Grapevine Purple Blotch Virus (GRBV) results in Crimson Blotch Ailment and is particularly transmitted inside the laboratory by alfalfa leafhopper Spissistilus festinus. The importance of anth