Resistance of stored-product insects to phosphine

Publication Type:Journal Article
:2008
Authors:M. Aurelio Gu Pimentel, Faroni, L. Rita D. 'Ant, Batista, M. Duarte, da Silva, F. Humberto
Journal:Pesquisa Agropecuaria Brasileira
Volume:43
Pagination:1671-1676
Date Published:December
Type of Article:Article
:0100-204X
:Sitophilus zeamais
:

The objectives of this work were to assess phosphine resistance in insect Populations (Tribolium castaneum, Rhyzopertha dominica, Sitophilus Zeamais and Oryzaephilus surinamenis) from different regions of Brazil and to verify if the prevailing mechanism of phosphine resistance in these populations involves reduced respiration rates. Sixteen Populations of T. castaneum, 15 of R. dominica, 27 of S. zeamais and eight of O. surinamensis were collected from 36 locations over seven Brazilian states. Each population vas tested for resistance to phosphine, based on the response of adults to discriminating concentrations, according to FAO standard method. For each insect species, the production of carbon dioxide of file most resistant and of the most Susceptible populations was inversely related to their phosphine resistance. The screening tests identified possible phosphine resistant populations. R. dominica and O. surinamensis were less susceptible to phosphine than the other two species. The populations with lower respiration rate showed a lower mortality at discriminating concentration, possibly related to a phosphine resistance mechanism. Phosphine resistance occurs in stored-product insects, in different regions of Brazil, and the resistance mechanism involves reduced respiration rate.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith