scholarly journals Estimation of the Relative Viabilities of Insecticide Resistance Genotypes of the Australian Sheep Blowfly Lucilia cuprina

1984 ◽  
Vol 37 (2) ◽  
pp. 45 ◽  
Author(s):  
JA McKenzie ◽  
MJ Whitten
Keyword(s):  
Insecticide Resistance ◽  
Organophosphorus Compound ◽  
Organochlorine Compound ◽  
Lucilia Cuprina ◽  
Australian Sheep

Artificial strikes were initiated on sheep at different times after treatment with either diazinon (an organophosphorus compound) or lindane (an organochlorine compound).

scholarly journals Field Studies on Insecticide Resistance in the Australian Sheep Blowfly, Lucilia Cuprina

1980 ◽  
Vol 33 (6) ◽  
pp. 725 ◽  
Author(s):  
MJ Whitten ◽  
JM Dearn ◽  
JA McKenzie
Keyword(s):  
Insecticide Resistance ◽  
Larval Development ◽  
Field Studies ◽  
Lucilia Cuprina ◽  
Insecticide Residue ◽  
Genotype Frequencies ◽  
Australian Sheep ◽  
Free Environment ◽  
Eggs And Larvae ◽  
Oviposition Sites

Eggs and larvae of L. cuprina were coIJected from natural fly strikes in a flock of Merino ewes in which sheep had been either treated with the insecticide dieldrin or left as controls. An analysis of gene and genotype frequencies of Rdl locus, which determines resistance to dieldrin, provides support for the existence of strong selection operating during larval development on sheep whose fleece contain insecticide residue. Resistance genotypes appear to be at a disadvantage both in the laboratory and in the insecticide-free environment of control sheep. There is no evidence that flies of different resistance status choose oviposition sites on the basis of the presence of dieldrin residues in the fleece.

scholarly journals Diazinon resistance, fluctuating asymmetry and fitness in the Australian sheep blowfly, lucilia cuprina.

Genetics ◽  
1988 ◽  
Vol 120 (1) ◽  
pp. 213-220 ◽  
Author(s):  
J A McKenzie ◽  
G M Clarke
Keyword(s):  
Fluctuating Asymmetry ◽  
Natural Populations ◽  
Lucilia Cuprina ◽  
Resistance Locus ◽  
Gene Complex ◽  
Subsequent Evolution ◽  
Genetic Analyses ◽  
Evolution Of Resistance ◽  
Australian Sheep ◽  
Chromosome Iii

Abstract Genetic evidence suggests that the evolution of resistance to the insecticide diazinon in Lucilia cuprina initially produced an increase in asymmetry. At that time resistant flies were presumed to be at a selective disadvantage in the absence of diazinon. Subsequent evolution in natural populations selected modifiers to ameliorate these effects. The fitness and fluctuating asymmetry levels of resistant flies are currently similar to those of susceptibles. Previous genetic analyses have shown the fitness modifier to co-segregate with the region of chromosome III marked by the white eyes, w, locus, unlinked to the diazinon resistance locus, Rop-1, on chromosome IV. This study maps the asymmetry modifier to the same region, shows, as in the case of the fitness modifier, its effect to be dominant and presents data consistent with the fitness/asymmetry modifier being the same gene (gene complex). These results suggest changes in fluctuating asymmetry reflect changes in fitness.

scholarly journals Genetic Analysis of Field Trials of Sex-linked Translocation Strains for Genetic Control of the Australian Sheep Blowfly Lucilia cuprina (Wiedemann)

1985 ◽  
Vol 38 (3) ◽  
pp. 275 ◽  
Author(s):  
GG Foster ◽  
WG Vogt ◽  
TL Woodburn
Keyword(s):  
Genetic Analysis ◽  
Genetic Control ◽  
Poor Performance ◽  
Field Trials ◽  
Lucilia Cuprina ◽  
Native Population ◽  
Australian Sheep ◽  
Males And Females ◽  
Progeny Tests ◽  
Release Method

The results of progeny tests of males and females captured during two field trials of sex-linked translocation strains for genetic control of L. cuprina are presented. Males released as mature larvae survived to adulthood and mated with field females. However, the levels of genetic death introduced into the population were insufficient to suppress the native population. This was due partly to seasonal ineffectiveness of the release method, and partly to poor performance of the released males. On average, the mating competitiveness of the released males was only one-third that of field males, whereas their field-reared, translocation-bearing sons were fully competitive with native males.

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