Effects of pesticides on filth fly predators (Coleoptera: Histeridae, Staphylinidae; Acarina: Macrochelidae, Uropodidae) in caged layer poultry manure.
A field study on two caged layer poultry operations assessed whether selected pesticides would affect beneficial predators. Sampling was done three times during the 5-wk period before treatment, 3 d after each of two weekly treatments, and 5-6 times during the 10 wk after the second treatment. Cyromazine (0.1%) applied topically had no detrimental effect on any of the predator taxa. Dimethoate (0.5%) applied as a spot treatment to wet areas of the manure also did not reduce predator abundance. Permethrin (0.05%) applied as a direct treatment to the hens resulted in slight reductions in numbers of Histeridae and Staphylinidae in the manure. A resurgence of Fanniinae occurred at one site 3 wk after permethrin application. Treatment of whole houses with dimethoate (0.5%) resulted in short-term reductions (up to 3 wk) of predatory mites and reductions of Histeridae and Staphylinidae for 4-10 wk.
Wills
L E
LE
Department of Entomology, University of California, Riverside 92521.
Mullens
B A
BA
Mandeville
J D
JD
D000818:Animals; D001517:Coleoptera; D004117:Dimethoate; D007306:Insecticides; D007605:Juvenile Hormones; D008372:Manure; D026023:Permethrin; D011200:Poultry; D011722:Pyrethrins
D007306:Insecticides; D007605:Juvenile Hormones; D008372:Manure; D011722:Pyrethrins; D026023:Permethrin; D004117:Dimethoate