title: New strategies for the control of the parthenogenetic chironomid (Paratanytarsus grimmii) (Diptera:Chironomidae) infecting water systems.
abstract: Control of the midge, Paratanytarsus grimmii, infesting municipal water systems has proven to be difficult, because it is a parthenogenetic species that can oviposit as a pharate adult and reproduce within the system. Mean densities of P. grimmii in a midwestern USA water distribution system ranged from approximately 140 to 560 individuals/sampling date, and all 4 instars and pupae were present throughout the sampling period. Two products were tested as potential chemical controls: Cat-Floc LS, a coagulant produced by the Calgon Corporation, and 35% hydrogen peroxide, a water purifier. The results of laboratory bioassays showed that Cat-Floc LS over a 15-day period was most effective against P. grimmii.
authors.affiliation: Department of Entomology, Michigan State University, East Lansing 48824, USA.
authors.forename: M K
authors.initials: MK
authors.lastname: Alexander
authors.forename: R W
authors.initials: RW
authors.lastname: Merritt
authors.forename: M B
authors.initials: MB
authors.lastname: Berg
mesh_terms: D000818:Animals; D002683:Chironomidae; D016001:Confidence Intervals; D003710:Demography; D005260:Female; D007196:Indiana; D007300:Insect Control / Q000379:methods*; D007814:Larva; D010058:Oviposition; D011156:Population Density; D011679:Pupa; D012621:Seasons; D014876:Water Pollution / Q000517:prevention & control*; D018508:Water Purification / Q000379:methods*; D014881:Water Supply / Q000592:standards*