Phytoparasitica (1996) 24, 240-241
P.J. Collins (1996)
Does underdosing select for resistance to phosphine?
Phytoparasitica 24 (3), 240-241
International Conference on Controlled Atmosphere and Fumigation (CAF) in Stored Products, April 21-26, 1996, Nicosia, Cyprus, lecture
Abstract: In eastern Australia farmers are becoming increasingly reliant on phosphine to control insect pests. Many fumigations undertaken on farms and by produce merchants occur in unsealed storages of all types. These fumigations vary considerably in the doses achieved and hence in their efficacy. The aim of this work was to determine what effect current small-scale fumigation practices have on selection for resistance to phosphine. Farm fumigations, undertaken in a variety of situations, were monitored to determine typical doses achieved in practice. Meanwhile, the responses to phosphine of adults, eggs and pupae of phosphine-resistant, heterozygous and susceptible Rhyzopertha dominica, Sitophilus oryzae and Tribolium castaneum were measured in the laboratory. Assays were conducted at a range of concentrations of phosphine for exposure periods of 3 and 6 days. The responses to phosphine of each life stage and each species varied considerably, as did the dominance of the resistant phenotype. A wide range of concentration x time profiles was observed in the field fumigations, none of which, however, would have controlled all stages of all species. Analysis of the responses to phosphine showed that any fumigation that does not achieve a dose sufficient to kill all life stages of resistant insects will select for resistance, i.e., underdosing will select for resistance. The significance of this result to the management of phosphine resistance was discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Patrick J. Collins
Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Tribolium castaneum | ||||
| Sitophilus oryzae | ||||
| Rhyzopertha dominica |
