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