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Homalodisca coagulata (Say), a xylem-fluid feeding leafhopper, vectors diseases induced by the bacterium Xylella fastidiosa such as phony peach disease and Pierce's disease. The purpose of this study was to investigate plant factors that influence feeding. H. coagulata were confined to stems of peach [Prunus persica (L.) Batsch] and crape myrtle (Lagerstroemia indica L.). Osmolarity, amino acid and organic acid concentrations of xylem fluid were maximum during the morning for peach and declined thereafter; xylem fluid chemistry of crape myrtle followed a less distinct trend. Irrigated plants had higher concentrations of organic constituents and feeding rates were higher on these plants. Feeding rates and xylem fluid tensions, were maximum during midday; feeding did not occur at night. In separate experiments feeding rates were greatly reduced at xylem tensions &gt;1.5 MPa.

hortscience

DIURNAL VARIATIONS IN PHYSICAL AND CHEMICAL PLANT FACTORS AFFECTING FEEDING OF HOMALODISCA COAGULATA, A VECTOR OF DISEASES INDUCED BY XYLELLA FASTIDIOSA.