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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Phosphine resistance in stored-product insects collected from various grain storage facilities in Morocco
Journal of Stored Products Research, Volume 40, No. 3, Year 2004
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Description
Despite heavy dependence on phosphine (PH3) for fumigating stored products, the resistance status of insect pests in Morocco has never undergone a thorough investigation. Some control failures with PH3 were reported in Morocco, and a previous study showed two field populations of Sitophilus oryzae to be highly resistant to phosphine. We surveyed phosphine resistance in field populations of three major insect pests of stored wheat in Morocco. Around 32% of the samples collected at different storage facilities were found to be infested with one or more species of stored-product beetles. First-generation adult beetles, cultured from the field samples, were subjected to a discriminating dose test for phosphine resistance using an FAO method. The results indicated that, with the exception of one population of S. oryzae, all samples tested contained phosphine-resistant individuals. Treatments at up to 1.8gm-3 of phosphine for 20h, or at 0.18gm-3 for up to 5 days, indicated that a high degree of resistance was already selected in some of the insect populations. Tests using [32P]-radiolabelled phosphine showed that the mechanism of resistance in the three insect species tested involved a reduced uptake of the fumigant. The study has highlighted an urgent need for reviewing current fumigation practices in Morocco to ensure effective use of phosphine and avoid further selection of resistance. Crown Copyright © 2003 Published by Elsevier Science Ltd. All rights reserved.
Authors & Co-Authors
Benhalima, H.
Morocco, Fes
D.p.v.c.t.r.f.
Chaudhry, Qasim Ali
United Kingdom, York
Central Science Laboratory York
Mills, Kenneth A.
United Kingdom, York
Central Science Laboratory York
Price, Nicholas R.
United Kingdom, York
Central Science Laboratory York
Statistics
Citations: 388
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1016/S0022-474X(03)00012-2
ISSN:
0022474X
Study Design
Cross Sectional Study
Study Locations
Morocco