There are disclosed 1-[4-(halophenoxy)phenoxy]-4-pentines of formula ##STR1## wherein R.sub.1 and R.sub.2 are each independently of the other chloro or fluoro and one of R.sub.1 and R.sub.2 is also hydrogen, a process for their preparation and intermediates for their preparation, the use of these compounds in pest control, and pesticidal compositions which contain a compound of formula I as active component. The preferred field of use is ovicidal control of pests.
This is a divisional of Ser. No. 07/740,657, filed Aug. 2, 1991, now U.S. Pat. No. 5,114,977, issued May 19, 1992, which in turn is a continuation of Ser. No. 07/403,254, filed Sep. 5, 1989, now abandoned.
Compositions and methods are disclosed for treating a hair-bearing surface of a warm-blooded animal, including humans, dogs and cats infested with an ectoparasitic insect, such as lice and/or fleas. Compositions and methods are also disclosed for preventing the infestation or re-infestation of an ectoparasitic insect, such as lice and/or fleas on a hair-bearing surface of a warm-blooded animal, including humans, dogs and cats. The compositions include either a water-soluble polyalkylene glycol or a water-soluble polyalkylene oxide mixed with a polymer or copolymer comprising polyalkylene oxide having carboxylic acid-containing residues. Methods of the invention include topical application to a hair-bearing surface of an effective amount of a composition of this invention, and maintaining the same on the surface for a sufficient period of time to treat the surface. Further optional steps include washing or rinsing the composition from the surface, as well as combing the hair associated with the treated surface.
