Daglish, G.J. (2004) Effect of exposure period on degree of dominance of phosphine resistance in adults of Rhyzopertha dominica (Coleoptera: Bostrychidae) and Sitophilus oryzae (Coleoptera: Curculionidae). Pest Management Science, 60 (8). pp. 822-826.
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Article Link(s): http://dx.doi.org/10.1002/ps.866
Publisher URL: http://www3.interscience.wiley.com/cgi-bin/home
Degree of dominance of phosphine resistance was investigated in adults of Rhyzopertha dominica F and Sitophilus oryzae L. Efficacy of the grain fumigant phosphine depends on both concentration and exposure period, which raises the possibility that dominance levels vary with exposure period. New and published data were used to test this possibility in adults of R dominica and S oryzae fumigated for periods of up to 144 h.
The concentrations required for control of homozygous resistant and susceptible strains and their F1 hybrids decreased with increasing exposure period. For both species the response lines for the homozygous resistant and susceptible strains and their F1 hybrids were parallel. Therefore, neither dominance level nor resistance factor was affected by exposure period. Resistance was incompletely recessive and the level of dominance, calculated at 50% mortality level, was -0.59 for R dominica and -0.65 for S oryzae. The resistant R dominica strain was 30.9 times more resistant than the susceptible strain, compared with 8.9 times for the resistant S oryzae strain. The results suggest that developing discriminating doses for detecting heterozygote adults of either species will be difficult.
|Business groups:||Agri-Science, Crop and Food Science|
|Additional Information:||© Society of Chemical Industry.|
|Keywords:||Phosphine resistance; dominance levels; Rhyzopertha dominica; Sitophilus oryzae.|
|Subjects:||Science > Zoology > Invertebrates > Insects|
Agriculture > Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Pesticides
Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Pesticides
|Deposited On:||14 Mar 2005|
|Last Modified:||27 Oct 2011 02:06|
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