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Gall Types for Predicting Fusiform Rust Damage to Loblolly Pine in the Field

A number of rust symptoms and their interrelationships were observed on loblolly pines in 8 locations. In one planting where infection was 90%, rust-associated mortality was 18% at age 12 and its relationship to various rust symptoms could be tested. None of the symptoms observed were highly correlated to rust-associated mortality for individual control-pollinated families. However, the number of galls growing from branches into stems in commercial plantations with 84% and 87% infection was highly correlated to rust-associated mortality. The percentage of trees with damaging galls that had moved into the stem was 83% for some of the more resistant families even though rust infection was less than 50%. The number of BG+S galls in loblolly pines is the most useful symptom to read. Keywords: Cronartium quercuum f. sp. fusiforme, disease severity, pathogenic variation, Pinus taeda L.

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Author(s): Charles H. Walkinshaw, Jr.

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1989

Section: Concurrent Session 3B