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Evaluation of Temperature on Searching Ability and Parasitism Rates of Muscidifurax raptorellus and Muscidifurax raptor in Dairy Barns and Calf Hutches 1997

Project Leaders:D. A. Rutz, S. J. Long and J. K. Waldron

Objectives:

1. Determine the impact of host location on the searching ability of M. raptorellus and M. raptor.

2. Determine the impact of temperature on the searching ability of M. raptorellus and M. raptor.

3. Determine the impact of host location on the parasitism rates of M. raptorellus and M. raptor.

4. Determine the impact of temperature on the parasitism rates of M. raptorellus and M. raptor

Results:

Both parasitoid species killed more house fly larvae located on the surface of the straw bedding than pupae that were buried 2.0 cm beneath the straw bedding. Neither parasitoid was able to locate buried pupae within 24 hours. More pupae were killed in the calf hutch than in the barn. Parasitism rates did not differ between species when compared within three temperature ranges. M. raptorellus produced multiple progeny only when temperatures exceeded 18°.