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Detection of Yellow Starthistle (Centaurea solstitialis) and Common St. Johnswort (Hypericum perforatum) with Multispectral Digital Imagery

Published online by Cambridge University Press:  12 June 2017

Lawrence W. Lass
Affiliation:
Dep. of Plant, Soil, and Entomol. Sci., Univ. of Idaho, Moscow, ID 83844-2339
Hubert W. Carson
Affiliation:
Dep. of Plant, Soil, and Entomol. Sci., Univ. of Idaho, Moscow, ID 83844-2339
Robert H. Callihan
Affiliation:
Dep. of Plant, Soil, and Entomol. Sci., Univ. of Idaho, Moscow, ID 83844-2339

Abstract

Ground-based surveys to regularly document the size, shape, and location of weed populations usually are not economically feasible. Digital images of vegetation in semiarid rangeland were obtained from four charge-coupled devices with spectral filters mounted in an airplane. The ability to distinguish yellow starthistle and common St. Johnswort from other rangeland vegetation in images with 0.5, 1, 2, and 4 m spatial resolution was assessed. Detection, positioning, and measurements of size and density of yellow starthistle and common St. Johnswort colonies with densities as low as 30% ground cover were possible at all those resolutions. Images indicated yellow starthistle occupied about one-third of a 180-ha study area. Images taken in June indicated 2 to 10 ha less yellow starthistle ranging from 30 to 100% cover than images taken in July for all resolutions. Images indicated common St. Johnswort occupied less than 4 ha of the 180-ha study area. This procedure provides a method to establish baseline plant community composition and a way to monitor species population changes and dispersal over time.

Type
Research
Copyright
Copyright © 1996 by the Weed Science Society of America 

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References

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