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Pyrethrum yield estimation by digital image analysis
Citation
Scott, JB and Pethybridge, SJ and Hay, FS, Pyrethrum yield estimation by digital image analysis, 2011 APS-IPPC Joint Meeting Abstracts of Presentations, 6-10 August, Honolulu, Hawaii, pp. S162. (2011) [Conference Extract]
 | PDF (Scott, J. B., Pethybridge, S. J., and Hay, F. 2011. Pyrethrum yield estimation by digital image analysis. Phytopathology 101:S162) Pending copyright assessment - Request a copy 3Mb |
Abstract
Pyrethrum is grown for the production of insecticidal pyrethrins. Production
in Australia is constrained by a number of fungal pathogens, including
Stagonosporopsis ligulicola and Sclerotinia spp. To accurately assess control
strategies for these and other diseases, a practical method of yield assessment
is required. Previously, yield assessment has relied upon destructive, manual
harvesting, which is both costly and time consuming. As an alternative, yield
estimation by digital image analysis was trialled at 29 sites in summer 2010,
with replication. Images were taken at a height of 0.9 m above the crop
canopy, encompassing a defined 0.7 × 0.7 m quadrat, placed level with flower
height. Image capture occurred once over 50% ray florets were open within a
crop. With the software package ImageJ, HSB color thresholding was used to
isolate the yellow centres of individual flowers, from which the particle
analyser function estimated the number of flowers per quadrat. Linear
regression indicated a strong relationship between automated (AC) and
manual (MC) flower counts, (AC = 21.1 + 0.97*MC; R2 = 0.95, P < 0.0001)
with an intercept not significantly greater than zero. A significant correlation
was also obtained between automated flower counts and hand harvested dry
weight of flowers (DW) from each quadrat (AC = 109.1 + 3.45*DW; R2 =
0.488, P < 0.0001). These results highlight the potential for predicting yield
using non-destructive image capture.
Item Details
| Item Type: | Conference Extract |
|---|---|
| Keywords: | pyrethrum, image analysis, yield estimation |
| Research Division: | Biological Sciences |
| Research Group: | Plant Biology |
| Research Field: | Plant Pathology |
| Objective Division: | Plant Production and Plant Primary Products |
| Objective Group: | Horticultural Crops |
| Objective Field: | Horticultural Crops not elsewhere classified |
| UTAS Author: | Scott, JB (Dr Jason Scott) |
| UTAS Author: | Pethybridge, SJ (Dr Sarah Pethybridge) |
| UTAS Author: | Hay, FS (Dr Frank Hay) |
| ID Code: | 100312 |
| Year Published: | 2011 |
| Deposited By: | Tasmanian Institute of Agriculture |
| Deposited On: | 2015-05-11 |
| Last Modified: | 2015-05-11 |
| Downloads: | 0 |
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