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- Title
RELATIVE FITNESS OF MALATHION-RESISTANT PHENOTYPES OF ORYZAEPHILUS SURINAMESIS L. (COLEOPTERA:SILVANIDAE).
- Authors
Muggleton, John
- Abstract
(I) Two malathion-resistant strains of Oryzaephilus surinamensis were cultured in the. laboratory in the absence of insecticide for 2 years. (2) Each successive generation of adults was tested for malathion resistance using a discriminating dose test. (3) In the absence of insecticide there was a decrease in the percentage of malathion-resistant beetles both in cultures taken from the field and in cultures first selected for resistance in the laboratory. (4) The relative fitness of the resistant animals compared to the susceptibles was estimated from the observed change in frequency of the susceptibles over the experimental period. (5) A least-squares estimate showed the fitness of the resistant animals in the unselected cultures to be 68% of that of the susceptibles in one strain and 77% of that of the susceptibles in the other strain. For the selected cultures the figures were 63% and 76% respectively. (6) The nature of this disadvantage is not known, but its discovery could lead to a method of control of resistance in this important pest of stored grain.
- Subjects
MALATHION; SAWTOOTHED grain beetle; ORYZAEPHILUS; INSECTICIDE resistance; GRAIN diseases &; pests; AGRICULTURAL pests
- Publication
Journal of Applied Ecology, 1983, Vol 20, Issue 1, p245
- ISSN
0021-8901
- Publication type
Article
- DOI
10.2307/2403390