Morphoanatomical Changes in Leaves Associated with Resistance to in Plants of Two Ages.

The fungus infects young tissues of plants until they are two years old in the nursery and field, causing Myrtaceae rust. The characteristics making older eucalypt leaves resistant to and the reason for the low levels of this pathogen in older plants need evaluations. The aim of this study was to evaluate the morphological differences between leaves of different growth stages and two plant ages to propose a visual phenological scale to classify leaves according to their maturation stages and to evaluate the time of leaf maturation for young and adult plants.