title: SEASON OF DELTAMETHRIN APPLICATION AFFECTS FLEA AND PLAGUE CONTROL IN WHITE-TAILED PRAIRIE DOG (CYNOMYS LEUCURUS) COLONIES, COLORADO, USA.
abstract: In 2008 and 2009, we evaluated the duration of prophylactic deltamethrin treatments in white-tailed prairie dog ( Cynomys leucurus ) colonies and compared effects of autumn or spring dust application in suppressing flea numbers and plague. Plague occurred before and during our experiment. Overall, flea abundance tended to increase from May or June to September, but it was affected by deltamethrin treatment and plague dynamics. Success in trapping prairie dogs (animals caught/trap days) declined between June and September at all study sites. However, by September trap success on dusted sites (19%; 95% confidence interval [CI] 16-22%) was about 15-fold greater than on undusted control sites (1%; CI 0.3-4%; P≤0.0001). Applying deltamethrin dust as early as 12 mo prior seemed to afford some protection to prairie dogs. Our data showed that dusting even a portion of a prairie dog colony can prolong its persistence despite epizootic plague. Autumn dusting may offer advantages over spring in suppressing overwinter or early-spring flea activity, but timing should be adjusted to precede the annual decline in aboveground activity for hibernating prairie dog species. Large colony complexes or collections of occupied but fragmented habitat may benefit from dusting some sites in spring and others in autumn to maximize flea suppression in a portion of the complex or habitat year-round.
authors.affiliation: 1   Colorado Division of Parks and Wildlife, Wildlife Health Program, 4330 Laporte Avenue, Fort Collins, Colorado 80521, USA.
authors.forename: Daniel W
authors.initials: DW
authors.lastname: Tripp
authors.affiliation: 1   Colorado Division of Parks and Wildlife, Wildlife Health Program, 4330 Laporte Avenue, Fort Collins, Colorado 80521, USA.
authors.forename: Sean P
authors.initials: SP
authors.lastname: Streich
authors.affiliation: 1   Colorado Division of Parks and Wildlife, Wildlife Health Program, 4330 Laporte Avenue, Fort Collins, Colorado 80521, USA.
authors.forename: Danielle A
authors.initials: DA
authors.lastname: Sack
authors.affiliation: 1   Colorado Division of Parks and Wildlife, Wildlife Health Program, 4330 Laporte Avenue, Fort Collins, Colorado 80521, USA.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Martin
authors.affiliation: 1   Colorado Division of Parks and Wildlife, Wildlife Health Program, 4330 Laporte Avenue, Fort Collins, Colorado 80521, USA.
authors.forename: Karen A
authors.initials: KA
authors.lastname: Griffin
authors.affiliation: 1   Colorado Division of Parks and Wildlife, Wildlife Health Program, 4330 Laporte Avenue, Fort Collins, Colorado 80521, USA.
authors.forename: Michael W
authors.initials: MW
authors.lastname: Miller
mesh_terms: D000818:Animals; D003120:Colorado; D009570:Nitriles; D010571:Pest Control; D010930:Plague / Q000517:prevention & control* / Q000662:veterinary; D011722:Pyrethrins; D012589:Sciuridae; D005423:Siphonaptera; D015010:Yersinia pestis
chemical_list: D009570:Nitriles; D011722:Pyrethrins; C017180:decamethrin
keywords: Black-footed ferret; Cynomys leucurus; Mustela nigripes; Yersinia pestis; deltamethrin; flea; plague; white-tailed prairie dog