Abstract
Abstract The xylem water potential of leaves of peach [Prunus persica (L.) Batsch] was lower for trees with moderate to high counts of the phony peach disease organism in roots during the day in September and October (P = 0.1%), after bloom in March (P = 3%), and before harvest in May (P = 1%). No significant differences occurred for predawn measurements on any date, during periods of rapid shoot growth in June, and for measurements made on terminal twigs in January. Experimental results suggest that the phony disease organism invades and clogs the new xylem each year. The internal water stress that results when the tree transpires produces the fruit and shoot symptoms known as phony disease of peach.
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