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Pierce’s condition (PD) of grapevine (Vitis vinifera) is because of the bacterium Xylella fastidiosa and it is vectored by xylem sap-sucking insects, Whilst Grapevine Red Blotch Virus (GRBV) brings about Crimson Blotch Disease and is particularly transmitted while in the laboratory by alfalfa leafhopper Spissistilus festinus. The significance of