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Pierce’s sickness (PD) of grapevine (Vitis vinifera) is a result of the bacterium Xylella fastidiosa and is particularly vectored by xylem sap-sucking insects, whereas Grapevine Purple Blotch Virus (GRBV) leads to Pink Blotch Condition which is transmitted while in the laboratory by alfalfa leafhopper Spissistilus festinus. The importance of anth