Open Access Repository

Investigation of factors relating to the insect infestation of chocolate-based consumables

Downloads

Downloads per month over past year

Bowditch, Terence Graham (1996) Investigation of factors relating to the insect infestation of chocolate-based consumables. PhD thesis, University of Tasmania.

[img]
Preview
PDF (Whole thesis (published material removed))
whole_Bowditch1...pdf | Download (18MB)
Available under University of Tasmania Standard License.

| Preview
[img] PDF (Whole thesis)
whole_BowditchT...pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.

Abstract

The aim of this study was to examine the factors relating to insect infestation of produce
manufactured at the Cadbury Schweppes' Tasmanian confectionery plant, in order to determine
means by which the incidence of product infestation could be minimized. Analysis of the company's
infestation-related consumer complaint databases revealed that: assortments (boxed-chocolates) were
most likely to be infested; the geographic distribution of complaints was temperature-dependent;
'old' stock and/or produce manufactured during spring was most likely to be infested; infested goods
were more likely to be purchased from smaller retail outlets and; the costs associated with infestation
were substantial. Phycitine moths were almost exclusively responsible for infestation, and it was estimated
that most cases of infestation occurred post-packaging, most likely while stock was in the hands of
independent wholesalers and retailers. A small proportion of infestation probably originated at the
Hobart plant, caused by a resident population of the almond moth, Ephestia cautella (Walker). This
population was traditionally suppressed by the blanket application of synergised pyrethrins
throughout the factory, although, an extensive pheromone trapping program indicated that the
spraying of pyrethrins affected neither the distribution of E. cautella, nor the capture rate, and the
distribution of E. cautella within the factory was primary dependent upon hygiene conditions. A
single room within the factory was identified as the primary source of migratory E. cautella, and a
control strategy, based on the mass trapping technique, successfully reduced E. cautella numbers in
this room to negligible levels. The influence of trap design on E. cautella catch was also evaluated.
Aspects of phycitine ecology with regard to the post-packaging infestation of produce were
examined, and it was found that both adult and juvenile phycitines responded positively to odours
escaping from chocolate boxes. The integrity of packaging significantly influenced the likelihood,
and extent, of infestation, while the polyvinyl chloride film used to overwrap assortment boxes was
found to be readily penetrated by several stored-product insect species. An alternative polypropylene
film offered significantly improved insect barrier properties.
A number of measures aimed at minimizing both pre- and post- packaging infestation were
recommended. At the factory, it was recommended that an insect pest control strategy relying on
advanced insect detection methods and improved sanitary procedures, supported by an appropriate
management structure, be adopted in preference to the current chemical-based strategy. With regard
to post-packaging infestation, it was recommended that wholesalers and retailers be educated about
the dangers that stored-product insects pose to goods, and methods through which insect apparency
can be minimized. It was also recommended that the utility of packaging materials and/or
technologies that completely retained odours and provide superior insect barrier qualities be
investigated. Also, that quality control procedures be implemented to monitor the integrity of product
packaging.

Item Type: Thesis (PhD)
Copyright Holders: The Author
Copyright Information:

Copyright 1996 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

The aim of this study was to examine the factors relating to insect infestation of produce manufactured at the Cadbury Schweppes' Tasmanian confectionery plant, in order to determine means by which the incidence of product infestation could be minimized. Phycitine moths were almost exclusively responsible for infestation, and it was estimated that most cases of infestation occurred post-packaging, most likely while stock was in the hands of independent wholesalers and retailers. Thesis (Ph.D.)--University of Tasmania, 1996. Includes bibliographical references. The aim of this study was to examine the factors relating to insect infestation of produce manufactured at the Cadbury Schweppes' Tasmanian confectionery plant, in order to determine means by which the incidence of product infestation could be minimized. Phycitine moths were almost exclusively responsible for infestation, and it was estimated that most cases of infestation occurred post-packaging, most likely while stock was in the hands of independent wholesalers and retailers

Date Deposited: 25 Nov 2014 00:46
Last Modified: 11 Mar 2016 05:55
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP