Integrated Approach Toward Reducing Losses from Fusiform Rust in Merchantable Slash and Loblolly Pine Plantations

摘要

The primary objective of this study was to evaluate the selective thinning of trees will rust galls as a means of reducing losses to the fusiform rust (Cronarium quercuum(Berk.) Miyabe ex Shiral f. sp. fusiforme) disease in merchantable slash (Pinus elliottii Engelm, var. elliottii) and loblolly (P. taeda L.) pine plantations. Additional objectives were to assess the post-thinning occurrence and impacts of southern pine beetles (Dendroctonus frontalis zimm.) and annsoum root rot (heterobasidion annosum Fr.). Nineteen rust-infected plantations were selected in Alabama, Georgia, and South Carolina to represent a wide range of stand and rust conditions. Thinnings were based primarily on the removal of trees with severe and moderate stem gidling caused by fusiform rust galls. Approximately 750 acres were thinned operationally to salvage potential mortality$ 2,250 nonthinned acres served as controls. Study plots were surveyed annually for 10 years to determine the amount and causes of mortality.