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Biomedical subjects

J L Jullien

Publications and source records attributed to J L Jullien.

24 records · Page 2Linked to original sources
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[Immediate larvicidal activity and residual action of the endotoxin of the serotype H-14 of Bacillus thuringiensis in 2 mosquito biotopes on the French Mediterranean coast].

The primary powder R.153.78 of the serotype H.14 of B. thuringiensis has been evaluated in small field plots against larvae of Ae. detritus and Cx. pipiens.. The minimal concentration of the primary powder inducing a complete mortality was 0.1 mg/1 against Ae. detritus and 0,4 mg/1 against Cx. pipiens, corresponding at dosages of respectively about 310-420 and 1240-1680 International Toxic Units per litre. The residual larvicide effectiveness was close to nil in spite of the chemical stability of the delta endotoxin in neutral and acid waters. Experimental formulations derived from this primary powder were less effective than, or at the best as effective as, the primary powder itself. The above findings confirm that the serotype H.14 of B. thuringiensis could constitute the basis of very effective new larvicides and suggest that formulation research has a major role to play to maximize the potential of this promising biological control agent.

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PubMedDate not supplied

[Comparative action of 31 insecticides on chlorpyrifos-sensitive and resistant Culex pipiens (L.) larvae in the South of France].

In urban and sub-urban areas larval populations of Culex pipiens are now resistant to chlorpyrifos. A replacement compound must be found so 31 pesticides were tested against 3 strains: 2 of them were bred in the laboratory (on sensitive and one resistant) and the third one collected in an area treated with agricultural pesticides and chlorpyrifos. The results show that this last compound induces a cross-resistance only to organophosphorus compounds especially to parathion, chlorpyrifos-methyl, pyrimiphos-methyl, diazinon and Abate. Agricultural pesticides made this species resistant to chlorinated hydrocarbon and organophosphorus compounds. Among the latest, trichlorfon, azinphos-methyl, methidathion and malathion are still efficient as are propoxur, Decis (pyrethroid), methoprene and Dimilin.

Animals↗
PubMedDate not supplied

[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 replacement compound for chlorpyrifos as there is a quick reinfestation and thus the treatment frequency had to be increased these last two years.

Animals↗