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Dispersion statistics and a sampling plan for Helicoverpa (Lepidoptera : Noctuidae) on fresh-market tomatoes (Lycopersicon esculentum)

Dawson, Joanne, Hamilton, Andrew J. and Mansfield, Catherine 2006, Dispersion statistics and a sampling plan for Helicoverpa (Lepidoptera : Noctuidae) on fresh-market tomatoes (Lycopersicon esculentum), Australian journal of entomology, vol. 45, no. 1, pp. 91-95, doi: 10.1111/j.1440-6055.2006.00509.x.

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Title Dispersion statistics and a sampling plan for Helicoverpa (Lepidoptera : Noctuidae) on fresh-market tomatoes (Lycopersicon esculentum)
Formatted title Dispersion statistics and a sampling plan for Helicoverpa (Lepidoptera : Noctuidae) on fresh-market tomatoes (Lycopersicon esculentum)
Author(s) Dawson, Joanne
Hamilton, Andrew J.
Mansfield, Catherine
Journal name Australian journal of entomology
Volume number 45
Issue number 1
Start page 91
End page 95
Publisher Wiley - Blackwell Publishing Asia
Place of publication Richmond, Vic.
Publication date 2006-02
ISSN 1326-6756
1440-6055
Keyword(s) aggregated
Helicoverpa spp.
sequential-sampling plan
spatial distribution
Taylor's Power Law
Summary Helicoverpa spp. is the primary pest in the Australian fresh-market tomato industry. We describe the spatial distribution of Helicoverpa spp. eggs on fresh-market tomato crops in the Goulburn Valley region of Victoria, and present a sequential sampling plan for monitoring population densities. The distribution of Helicoverpa spp. eggs was highly contagious, as indicated by a Taylor's b-value of 1.59. This high level of contagion meant that relatively large sample sizes would need to be collected to obtain an estimate of population density. High-precision sampling plans generally necessitated impractical sample sizes, and thus the plan we present is a relatively low-precision level plan (SE/mean = 0.3). Nonetheless, this level of precision is considered adequate for most agronomic scenarios. The plan was validated using a statistical re-sampling approach. The level of precision achieved was generally close to the nominal level. Likewise, the number of samples collected generally showed little departure from the theoretically calculated minimum sample size.
Language eng
DOI 10.1111/j.1440-6055.2006.00509.x
Field of Research 010401 Applied Statistics
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2006, Australian Entomological Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008990

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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