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Image Analysis of Leafy Spurge (Euphorbia esula) Cover

Published online by Cambridge University Press:  12 June 2017

Jennifer L. Birdsall ,
Paul C. Quimby Jr. ,
Norman E. Rees ,
Tony J. Svejcar  and
Bok F. Sowell
Jennifer L. Birdsall
Affiliation:
USDA-FS Forestry Sciences Laboratory, Bozeman, MT 59717
Paul C. Quimby Jr.
Affiliation:
USDA-ARS, Sidney, MT 59270
Norman E. Rees
Affiliation:
USDA-ARS, Sidney, MT 59270
Tony J. Svejcar
Affiliation:
USDA-ARS Eastern Oregon Agricultural Research Center, Burns, OR 97720
Bok F. Sowell
Affiliation:
Department of Animal and Range Sciences, Montana State University, Bozeman, MT 59717
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Abstract

We examined whether image analysis could separate leafy spurge from other plant species and objects by comparing image analysis to the ocular method of estimating cover. Image analysis was acceptably precise at low and medium cover levels. Image analysis was as repeatable as the ocular method at all sites and cover levels and acceptably reliable at low and medium cover levels but estimated cover lower by 12 to 22% than the ocular method at high cover levels. The average error levels of image analysis and the ocular method did not differ. Estimating leafy spurge cover with a 10% error required only 20 quadrats when image analysis was used, while twice as many quadrats were needed when cover was measured ocularly. Image analysis was recommended as a measurement tool because quantification was efficient, the equipment is inexpensive, and the color prints provide a permanent photo record of the study.

Keywords

Leafy spurge, Euphorbia esula L. # EPHESPlant measurementsplant sampling
Type
Research
Information
Weed Technology , Volume 11 , Issue 4 , December 1997 , pp. 798 - 803
Copyright
Copyright © 1997 by the Weed Science Society of America 

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