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Precision and accuracy of pest and pathogen damage assessment in young eucalypt plantations


Smith, AH and Pinkard, EA and Stone, C and Battaglia, M and Mohammed, CL, Precision and accuracy of pest and pathogen damage assessment in young eucalypt plantations, Environmental Monitoring and Assessment, 111, (1-3) pp. 243-246. ISSN 0167-6369 (2005) [Refereed Article]

DOI: doi:10.1007/s10661-005-8222-5


Fungal pathogens, browsing mammals, birds, insects, nutrient deficiencies, drought, frost and waterlogging are all damaging agents to plantation species. The subsequent loss in leaf tissue or reduced photosynthetic potential can reduce growth and potentially lead to tree death. The Crown Damage Index (CDI) was developed in Australia to quantify damage in young eucalypt plantations. The accuracy and precision of assessing damage at a tree level were determined to ensure the reliability, objectivity and repeatability of the CDI method. Nine assessors, with varying levels of experience, estimated damage on three plots of fifty trees each, to obtain an understanding of the subjectivity of assessing damage caused by insects (e.g. hrysophtharta spp.) and fungal pathogens (e.g. Mycosphaerella spp.) on Eucalyptus globulus. Damage levels were measured by destructive sampling to enable direct comparisons between estimates and damage levels to be made. The most experienced assessors provided the most repeatable estimates and were generally the most accurate. The incidence of foliar necrosis was the least subjective measure while defoliation was the most subjective and the least accurate of the indices measured. All assessors, regardless of experience, were able to predict the Crown Damage Index (a combined index of all damage classes) to within 12% of measured damage levels. © Springer Science + Business Media, Inc. 2005.

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:Smith, AH (Dr Anna Smith)
UTAS Author:Pinkard, EA (Dr Elizabeth Pinkard)
UTAS Author:Battaglia, M (Dr Michael Battaglia)
UTAS Author:Mohammed, CL (Professor Caroline Mohammed)
ID Code:39691
Year Published:2005
Web of Science® Times Cited:13
Deposited By:Agricultural Science
Deposited On:2007-08-01
Last Modified:2011-10-03

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