The cost of quinine Cinchona pubescens control on Santa Cruz Island, Galapagos

Buddenhagen, Chris and Yanez, Patricio (2005) The cost of quinine Cinchona pubescens control on Santa Cruz Island, Galapagos. Galapagos Research, 63, pp. 32-36.

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We analyse the cost of controlling the invasive quinine tree Cinchona pubescens Vahl in the highlands of Santa Cruz Island, Galapagos. Control costs in ten 400 m2 plots formed the basis for estimating the cost of control over the whole island. In the plots, densities were 2100–24,000 stems/ha (stems >150 cm tall) and 55,000–138,000 stems/ha (all size classes combined). Control involved uprooting small plants, and applying of a mix of metsulfuron methyl and picloram to cut stumps or to machete cuts in the bark of larger trees. These methods are presently used by Galapagos National Park field crews to control quinine. Costs (in man hours, herbicide and US$) were related to stem density; the density of stems summed across four height classes was a better predictor of costs than density of any one size class. Regressions (on all size classes combined) formed the basis for predictive models of costs. Costs ranged from $14 to $2225 per ha depending on stem density. The amount of herbicide (active ingredient/ha) that must be applied to high density stands of quinine is higher than typical rates of application in an agricultural setting. The cost of treating all existing plants once across quinine’s known range on Santa Cruz Island (c. 11,000 ha) was estimated at c. US$1.65 million. CDF Contribution Number 1013.

Item Type: Article
Title: The cost of quinine Cinchona pubescens control on Santa Cruz Island, Galapagos
Personal Creator/Author:
Buddenhagen, Chris
Yanez, Patricio
Refereed: Yes
Journal or Publication Title: Galapagos Research
Volume: 63
Page Range: pp. 32-36
Date: June 2005
ISSN: 1390-2830
Latitude: -0.616667
Longitude: -90.35
Projects: Project ECU/00/G31 “Control of Invasive Species in the Galapagos Archipelago”
Funders: Global Environment Facility
Issuing Agency: Fundacion Charles Darwin Foundation
Uncontrolled Keywords: invasive plants;control;quinine;Cinchona pubescens;Isla Santa Cruz;Galapagos
Subjects: Biology
Item ID: 9971
Depositing User: Ms Sally Taylor
Date Deposited: 08 Sep 2012 17:31
Last Modified: 08 Sep 2012 17:31
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