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Effects of Mycosphaerella leaf disease on the spectral reflectance of juvenile Eucalyptus globulus foliage


Pietrzykowski, E and Stone, C and Pinkard, E and Mohammed, CL, Effects of Mycosphaerella leaf disease on the spectral reflectance of juvenile Eucalyptus globulus foliage, Forest Pathology, 36, (5) pp. 334-348. ISSN 1437-4781 (2006) [Refereed Article]

DOI: doi:10.1111/j.1439-0329.2006.00459.x


Mycosphaerella leaf disease (MLD) can cause significant discoloration, necrosis and defoliation in commercial plantations of young Eucalyptus globulus. This study investigated the spectral reflectance changes that result in E. globulus foliage from Mycosphaerella infection. Spectral reflectance measurements were made on healthy and infected E. globulus foliage in the visible and near-infrared wavelengths (400-1000 nm). Reflectance (R) at 760 nm produced the largest difference between the extremes of disease severity classes. The wavelength most sensitive to infection severity was R678 nm. Other sensitive wavelengths were located between 480 and 500 nm. The wavelengths near 708 and 550 nm appeared relatively insensitive to infection severity. The reflectance index best correlated to leaf infection was R678/R550 (r = 0.841, p < 0.0001). This index was used in a linear regression model for successfully predicting leaf infection levels from an independent data set (r = 0.95, p < 0.0001). © 2006 The Authors.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Forestry sciences not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Other plant production and plant primary products
Objective Field:Other plant production and plant primary products not elsewhere classified
UTAS Author:Pietrzykowski, E (Dr Elizabeth Pietrzykowski)
UTAS Author:Pinkard, E (Dr Elizabeth Pinkard)
UTAS Author:Mohammed, CL (Professor Caroline Mohammed)
ID Code:39722
Year Published:2006
Web of Science® Times Cited:23
Deposited By:Agricultural Science
Deposited On:2007-08-01
Last Modified:2008-03-07

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