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Economic Impact of Fusiform Rust on the Value of Loblolly Pine Plantations

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Computer simulation showed that the economic impact of stem infections on loblolly pine (Pinus taeda L.) by fusiform rust, caused by Cronartium quercuum (Berk.) Miyabe ex Shirai f. sp. fusiforme, differed for a management scheme intended to produce primarily pulpwood and another intended to produce primarily sawlogs. The conversion-return method was used to take into account that logging, transportation, and milling costs are the same for infected and noninfected logs while the value of solid-wood products from infected logs is reduced. Stumpage values for a pulpwood management scheme (final harvest at age 25) declined approximately linearly at about 2%-2.5% per 10% increase in stem rust infection (at age 5) to 80%-84% of the value of a stand with 10% or less rust. For a sawlog management scheme (one thinning at peak periodic annual increment and final harvest at age 35) maximum reductions in stumpage values ranged from 2% to 5% of the stumpage value for a stand with no stem rust. At site indexes 60 and 65, rust infection percentages up to 40% at age 5 had no significant impact on stand values. Increasing rust infection from 60% to 90% reduced stand values by about 0.8% to 1.2% per 10% increase in rust infection to a total of 2% to 4% of the value of a stand with no rust. For site indexes 70 and greater, stand values declined by about 0.6% per 10% increase in rust infection to a total of 4% to 5% of stand value with zero rust. Land managers can use the results of our simulation to estimate losses from fusiform rust or the benefits from strategies designed to reduce rust infection. South. J. Appl. For. 21(4):187-192.

Document Type: Journal Article

Affiliations: National Assessment Coordinator, Forest Health Monitoring, USDA Forest Service, Research Triangle Park, NC

Publication date: November 1, 1997

More about this publication?
  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Southern Journal of Applied Forestry covers an area from Virginia and Kentucky south to as far west as Oklahoma and east Texas.
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