Daglish, G.J. and Collins, P.J. and Pavic, H. (2003) Prospects for predicting insect mortality in relation to changing phosphine concentrations. In: Advances in stored product protection. Proceedings of the 8th International Working Conference on Stored Product Protection. Poster Session 108. Theme IV, Chemical and Physical Control, 22-26 July 2002,, York, UK.
Typically, in bag-stack or silo fumigations the concentration of phosphine is not constant, and yet most of what is known about phosphine efficacy against grain insects comes from studies with fixed concentrations. Indeed, where changing concentration experiments have been performed, researchers have been unable to explain observed efficacy on the basis of data from fixed concentrations. The ability to predict insect mortality in relation to changing phosphine concentrations would facilitate the development of effective fumigation protocols. In this paper, we explore the prospects for making such predictions.
After reviewing published and new results, we conclude that the commonly used concentration x time (Ct) product is unreliable for this purpose. New results, for a strongly resistant strain of Rhyzopertha dominica from Australia, suggest that the relationship Cnt = k may be useful for predicting mortality of this type of insect in changing concentrations. However, in the case of a strain of Sitophilus oryzae with a type of resistance common in Australian S. oryzae, the relationship Cnt = k proved to be less reliable.
|Item Type:||Conference or Workshop Item (Paper)|
|Corporate Creators:||Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science|
|Business groups:||Agri-Science, Crop and Food Science|
|Additional Information:||Reproduced with permission of © CABI Publishing. Access to published version may be available via Publisher’s website.|
|Keywords:||Phosphine; changing concentrations; Rhyzopertha dominica; Sitophilus olyzae; resistance.|
|Subjects:||Science > Zoology > Invertebrates > Insects|
Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Pesticides
|Deposited On:||09 Jul 2004|
|Last Modified:||27 Oct 2011 01:05|
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