Journal of Economic Entomology (2000) 93, 1357-1363

Patrick J. Collins, Manoj K. Nayak and Rosemary Kopittke (2000)
Residual efficacy of four organophosphate insecticides on concrete and galvanized steel surfaces against three liposcelid psocid species (Psocoptera: Liposcelidae) infesting stored products
Journal of Economic Entomology 93 (4), 1357-1363
Abstract: Four organophosphate insecticides, azamethiphos, fenitrothion, chlorpyrifos-methyl, and pirimiphos-methyl, were tested as surface treatments on concrete (porous surface) and galvanized steel (nonporous surface) panels (0.3 by 0.3 m) against adults of three Liposcelid psocid spp.—Liposcelis bostrychophila Badonnel, Liposcelis entomophila (Enderlein), and Liposcelis paeta Pearman. Residual efficacy of these chemicals was assessed at 30 ± 1°C, 70 ± 2% RH, and a photoperiod of 12:12 (L: D) h from 1 d after treatment (0 wk) and thereafter at weeks 1, 2, 4, 6, and 8, and then every 4 wk up to week 40. Mortality was recorded at exposure periods of 6 h and then every 24 h until end-point was achieved. L. bostrychophila was the most susceptible species to the organophosphates tested, followed by L. paeta and L. entomophila. We conclude that for long-term protection, azamethiphos is the preferred organophosphate against L. bostrychophila (up to 36 wk on steel and 24 wk on concrete storage surfaces) and L. paeta infestations only on steel surface (up to 28 wk). None of the four organophosphates tested, however, would provide long-term protection against L. paeta on concrete surface and against L. entomophila infestations on either concrete or steel storage surfaces.
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Database assignments for author(s): Patrick J. Collins, Manoj K. Nayak

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Liposcelis paeta	Stored grain	Australia (NT+QLD)
	Liposcelis bostrychophila	Stored grain	Australia (NT+QLD)
	Liposcelis entomophila	Stored grain	Australia (NT+QLD)