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Influence of concentration, temperature and humidity on the toxicity of phosphine to the strongly phosphine-resistant psocid Liposcelis bostrychophila Badonnel (Psocoptera: Liposcelididae)

Nayak, M.K. and Collins, P.J. (2008) Influence of concentration, temperature and humidity on the toxicity of phosphine to the strongly phosphine-resistant psocid Liposcelis bostrychophila Badonnel (Psocoptera: Liposcelididae). Pest Management Science, 64 (9). pp. 971-976.

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Article Link(s): http://dx.doi.org/10.1002/ps.1586

Publisher URL: http://www3.interscience.wiley.com/cgi-bin/home

Abstract

BACKGROUND: The psocid Liposcelis bostrychophila Badonnel, is a widespread, significant pest of stored commodities, has developed strong resistance to phosphine, the major grain disinfestant. The aim was to develop effective fumigation protocols to control this resistant pest.

RESULTS: Time to population extinction of all life stages (TPE) in days was evaluated at a series of phosphine concentrations and temperatures at two relative humidities. Regression analysis showed that temperature, concentration and relative humidity all contributed significantly to describing TPE (P < 0.001, R2 = 0.95), with temperature being the dominant variable, accounting for 74.4% of the variation. Irrespective of phosphine concentration, TPE was longer at lower temperatures and high humidity (70% RH) and shorter at higher temperatures and low humidity (55% RH). At any concentration of phosphine, a combination of higher temperature and lower humidity provides the shortest fumigation period to control resistant L. bostrychophila. For example, 19 and 11 days of fumigation are required at 15 °C and 70% RH at 0.1 and 1.0 mg L-1 of phosphine respectively, whereas only 4 and 2 days are required at 35 °C and 55% RH for the same respective concentrations.

CONCLUSIONS: The developed fumigation protocols will provide industry with flexibility in application of phosphine.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science, Plant Science
Business groups:Agri-Science, Crop and Food Science
Additional Information:© The State of Queensland (through the Department of Primary Industries and Fisheries). © Society of Chemical Industry.
Keywords:Liposcelis bostrychophila; strong resistance; phosphine; fumigation protocols.
Subjects:Science > Zoology > Invertebrates > Insects
Plant culture > Harvesting, curing, storage
Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Pesticides
Deposited On:02 Feb 2009 03:48
Last Modified:25 Oct 2011 22:59

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