Fig. 3. One- and two-year-old peach stems inoculated with L. persoonii.  Light micrographs of longitudinal section of peach bark and vascular cambial (VC) tissues seven days after inoculation with L. persoonii showing hyphal aggregation (H) in cortex and alteration of cambial derivatives (arrow). Colonization proceeding from right to left. Note that very little new phloem has been produced. x560.