Abstract: A composition which can be used as a bait for anthropophilic flies, containing a synergistic mixture of at least one alkene having 19 to 24 carbon atoms, in which the ethylenic bond is located after a carbon atom in the range between the 7-position and the 11-position, and at least one aminoacid source selected from the group comprising the biochemical class of protides.

Abstract: An evaporator system adapted for emitting insect killing vapors of an insecticide therefrom and comprising a liquid or solid composition enclosed therein, said insecticide consisting in at least one volatile phosphoric acid ester which is stabilized by at least one diazene compound.

Abstract: An insecticidal evaporator is described which comprisesI a liquid composition containingA. 40 to 90% by weight approximately calculated on the total weight of the composition of a volatile insecticidal ester of phosphoric acid the vapor pressure of which is at least 10.sup..sup.-3 Torr at 20.degree.C;b. at least one first additional organic liquid compound having a vapor pressure less than or equal to that of the volatile insecticidal ester;C. at least a second additional organic compound miscible or soluble in the mixture of the volatile insecticidal ester and of the first additional compound;Ii. a fibrous mass absorbent for the said composition I, and impregnated by the same; andIii a diffusion layer covering at least a part of the surface of the said fibrous mass, the remainder of the surface of the fibrous mass being covered by an envelope impermeable to the said composition.