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Spectral characterization of necrosis from reflectance of Eucalyptus globulus leaves with Mycosphaerella leaf disease or subjected to artificial lesions

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Barry, KM and Corkrey, SR and Pham Thi, H and Mohammed, CL (2011) Spectral characterization of necrosis from reflectance of Eucalyptus globulus leaves with Mycosphaerella leaf disease or subjected to artificial lesions. International Journal of Remote Sensing, 32. pp. 9243-9259.

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Abstract

Necrosis is one of a range of symptoms resulting from a number of different biotic
and abiotic damage agents that may be detected and quantified with remote sensing
as part of an operational forest health monitoring system.Mycosphaerella leaf
disease (MLD) caused by Teratosphaeria spp. (formerly known as Mycosphaerella
spp.) is the most common foliar disease in young Australian Eucalyptus globulus
plantations. Necrosis often occurs in conjunction with other visible symptoms
such as chlorosis and reddening, and we have tested whether these symptoms alter
the ability of spectral approaches to detect necrosis. We completed two studies of
necrosis with pot-grown E. globulus plants; one in which necrosis was induced by
artificial infection of Teratosphaeria spp. and one in which necrosis was induced by
injury, superimposed on plants with established reddening or chlorosis. Using spectral
sensitivity analysis we found that across the two studies, wavelengths between
679 and 695 nm were most sensitive to the presence of necrosis and those between
706 and 726 nm were least sensitive. A new vegetation index (VI) was able to statistically
group necrotic treatments together while grouping non-necrotic treatments
together, regardless of reddening and chlorosis, which other relevant indices could
not. Multivariate methods utilized many wavelengths throughout the spectrum
and enabled much greater distinction of all treatment groups related to necrosis,
compared with the VIs. Wavelengths in the 679–695 nm range were only occasionally
selected as key wavelengths; therefore, results were not similar to the spectral
sensitivity data.

Item Type: Article
Journal or Publication Title: International Journal of Remote Sensing
Page Range: pp. 9243-9259
Identification Number - DOI: 10.1080/01431161.2010.550948
Additional Information:

The definitive published version is available online at: http://www.tandf.co.uk/journals

Date Deposited: 10 Feb 2012 05:46
Last Modified: 18 Nov 2014 04:27
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