Abstract
Leaves of pecan (Carya illinoensis) cultivars Schley, Stuart, Success, and Stevens and of mockernut hickory (C. tomentosa) plus nut husks from Schley and Stuart were compared by scanning electron microscopy for differences in surface morphology. Internal tissue structure was also compared by freeze-fracture of some selected samples. Scab lesions on leaves of susceptible Schley pecan were made up of dense, compact mats of mycelium with prolific sporulation. There was complete breakdown of host spongy and palisade parenchyma cell structure. Leaf lesions on resistant mockernut hickory had sparse mycelial growth, no sporulation, and minimal disruption of surface and internal tissue structure. The reactions of other cultivars varied between these extremes
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