Hyperspectral measurements of yellow rust and fusarium head blight in cereal crops: Part 1: Laboratory study

A - Papers appearing in refereed journals

Whetton, R. L., Hassall, K. L., Waine, T. W. and Mouazen, A. M. 2018. Hyperspectral measurements of yellow rust and fusarium head blight in cereal crops: Part 1: Laboratory study. Biosystems Engineering. 166, pp. 101-115. https://doi.org/10.1016/j.biosystemseng.2017.11.008

AuthorsWhetton, R. L., Hassall, K. L., Waine, T. W. and Mouazen, A. M.
Abstract

This paper assesses the potential use of a hyperspectral camera for measurement of yellow rust and fusarium head blight in wheat and barley canopy under laboratory conditions. Scanning of crop canopy in trays occurred between anthesis growth stage 60, and hard dough growth stage 87. Visual assessment was made at four levels, namely, at the head, at the flag leaves, at 2nd and 3rd leaves, and at the lower canopy. Partial least squares regression (PLSR) analyses were implemented separately on data captured at four
growing stages to establish separate calibration models to predict the percentage coverage of yellow rust and fusarium head blight infection. Results showed that the standard deviation between 500 and 650 nm and the squared difference between 650 and 700 nm wavelengths were found to be significantly different between healthy and infected canopy particularly for yellow rust in both crops, whereas the effect of water-stress was generally found to be unimportant. The PLSR yellow rust models were of good prediction capability
for 6 out of 8 growing stages, a very good prediction at early milk stage in wheat and a moderate prediction at the late milk development stage in barley. For fusarium, predictions were very good for seven growing stages and of good performance for anthesis growing stage in wheat, with best performing for the milk development stages. However, the root mean square error of predictions for yellow rust were almost half of those for fusarium, suggesting higher prediction accuracies for yellow rust measurement under
laboratory conditions.

KeywordsYellow rust (Puccinia striiformis); Fusarium head blight (Fusarium graminearum); Wheat; Barley; Crop Canopy; Partial least square regression
Year of Publication2018
JournalBiosystems Engineering
Journal citation166, pp. 101-115
Digital Object Identifier (DOI)https://doi.org/10.1016/j.biosystemseng.2017.11.008
Web address (URL)https://www.sciencedirect.com/science/article/pii/S1537511016308479
Open accessPublished as non-open access
FunderDepartment of Environment, Food and Rural Affairs
Output statusE-publication ahead of print
Publication dates
Online11 Dec 2017
Publication process dates
Accepted20 Nov 2017
PublisherAcademic Press Inc Elsevier Science
Copyright licenseCC BY
ISSN1537-5110

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