| resistance to bacillus sphaericus in culex pipiens (diptera: culicidae): interaction between recessive mutants and evolution in southern france. | in southern france, failure to control culex pipiens l. with bacillus sphaericus neide toxin (bs) was first detected in 1994, at the extreme east of the languedoc-roussillon coast. this failure was due to a single recessive mutant, sp-1r. two complementary strategies were used to test whether sp-1r had invaded the bs-controlled area by 1998. first, a strain (bp) was selected from resistant larvae sampled in the western part of the bs-controlled area. in bp strain, resistance involved a single re ... | 2001 | 11580038 |
| identification of two distinct amplifications of the esterase b locus in culex pipiens (l.) mosquitoes from mediterranean countries. | two new highly active esterases were detected by starch electrophoretic studies in culex pipiens mosquitoes from the area of montpellier (france) and from cyprus. we demonstrate here that both the french and the cyprus esterases b are overproduced due to amplification of the coding gene. the production of the esterase b is approximately 50- and 500-fold higher in mosquitoes from france and cyprus, respectively, than in susceptible insects, whereas the number of gene copies is about 25 and 250. d ... | 1992 | 1520252 |
| [progressive acquisition of resistance to chlorpyrifos in culex pipiens (l.) larvae in the south of france]. | a high resistance level has been detected in certain culex pipiens populations after seven years of chlorpyrifos larval treatments in the montpellier area (southern france). the highest rate recorded in 1973 was x 15, in 1974 x 33,3, in 1975 x 47 and in 1976 x 73. the resistance level depends on the application frequency of this larvicide and the various biotope types. "closed populations" are subjected to a higher selection pressure than "open populations". it is now necessary to find a replace ... | 1977 | 89656 |
| on the worldwide spread of an insecticide resistance gene: a role for local selection. | adaptation occurs by gene replacement (or transient balanced polymorphism). replacement may be caused by selection (local or global) and/or genetic drift among alleles. in addition, historical events may blur the respective effects of selection and drift during the course of replacement. we address the relative importance of these processes in the evolution of insecticide resistance genes in the mosquito culex pipiens. the resistance allele, ester2, has a broad geographic distribution compared t ... | 2005 | 16313460 |
| [genetic battle against culex pipiens in the montpellier area. 2nd year of observations]. | | 1972 | 4521088 |
| [an experiment in genetic control of culex pipiens in the area of montpellier]. | | 1971 | 5153483 |