The effectiveness of Mesocyclops longisetus (Copepoda) for the control of container-inhabiting mosquitoes in residential environments.

The cyclopoid crustacean Mesocyclops longisetus was evaluated for its predatory potential to reduce container-inhabiting mosquitoes in 5 suburban Florida backyards. Aedes albopictus, Ae. triseriatus, and Culex quinquefasciatus were the predominant species collected from containers. At an initial inoculation rate of approximately 120 copepods per container, M. longisetus populations eliminated resident mosquito larvae for a minimum of 14 wk in 30-liter plastic buckets and up to 29 wk in 0.4-liter ceramic flowerpots and 0.3-liter glass jars depending on species. Copepod populations generally peaked 13 wk after introduction (August) in ceramic flowerpots and glass jars and about 1 month later in tires, plastic buckets, and plastic flowerpots. At the time of peak abundance, average predator numbers ranged between 900 (glass jar) to >3000 (30-liter bucket) individuals per container. Although all mosquito species were eliminated from all containers sometime during the 35-wk study, M. longisetus appeared to preferably prey on Aedes larvae compared with Culex. Operationally, the use of M. longisetus as a tool for control of container-inhabiting mosquitoes in urban/suburban settings proved to be relatively inexpensive, required little labor for colony maintenance, was easily transported, and easily applied.

Prey and size preference of Mesocyclops longisetus (Copepoda) for Aedes albopictus and Culex quinquefasciatus larvae.

Laboratory studies investigated prey choice of the adult copepod Mesocyclops longisetus for Aedes albopictus and Culex quinquefasciatus larvae. Prey size preference by this predator was tested within and between instar classes at 10 and 30 degrees C. Single copepod adults preferred to prey on 1st and 2nd instars regardless of whether either species was alone or combined. Generally, M. longisetus preyed more on Ae. albopictus than on Cx. quinquefasciatus when similar larval stages were present. Also more prey of both species were consumed at 30 degrees C compared with 10 degrees C.