Susceptibility to Brown-Spot Needle Blight and Fusiform Rust in Selected Longleaf Pine Hybrids

Fusiform rust (Cronartium quercuum (Berk.) Miyabe ex Shirai f. sp. fusiforme (Hedgc. & Hunt) Burdsall & Snow)collected on loblolly pine (Pinus taeda L.) was used to inoculate progeny from 15 longleaf pine (P. palustris Mill.) controlled crosses, 7 longleaf X slash pine (P. elliottii Engelm. )hybrids, 5 longleaf X Sonderegger (natural longleaf X loblolly hybrid) hybrids, 3 longleaf X loblolly hybrids, and wind pollinated progeny from each of the parent trees. Field plantings also were established to compare fusiform rust in greenhouse inoculations with field incidence of fusiform rust as well as brown-spot needle blight (Mycosphaerella dearnessii Barry. There was no relationship between fusiform rust infection in the greenhouse and brown-spot needle blight after 3 years in the field in the longleaf crosses and the hybrids. There was also no relationship between nursery height and brown-spot needle blight in the longleaf crosses, but there was a negative relationship in the hybrids. The results indicate that resistance to brown-spot can be incorporated into longleaf breeding programs without changing susceptibility to fusiform rust. Tree Planters' Notes 47:11-15; 1996.

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Author(s): Larry H. Lott, Ronald C. Schmidtling, Glenn A. Snow

Publication: Tree Planters' Notes - Volumes 47, Number 1 (1996)

Section: Research Articles

Volume: 47

Number: 1