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Southwestern Entomologist (2005) 30, p. 245 (Davey et al.)
Ronald B. Davey, J. Allen Miller, John E. George and Daniel E. Snyder (2005)
Effect of repeated spinosad treatments on cattle against Boophilus annulatus under South Texas field conditions
Southwestern Entomologist 30 (4), 245-245
Abstract: Repeated treatments of spinosad applied as a whole-body spray to calves infested with Boophilus annulatus (Say) were evaluated in two separate but continuous trials to determine whether a field population of ticks could be eradicated. Calves were treated at 3-wk intervals at 0.05% active ingredient (AI) for 21 wk (seven treatments); followed by 0.08% AI during the subsequent 18-wk (six treatments). While neither concentration resulted in eradication, fewer ticks were observed when the concentration was 0.08% AI. At 1 wk following each spinosad treatment, there were significantly fewer ticks on the treated (TG) calves on 10 of the 13 counting periods (76.9%). However, at 2 wk following each of the 13 treatments, tick counts on TG calves increased substantially compared to counts obtained at either 1 or 3 wk after each treatment, particularly when the spinosad concentration was 0.05% AI. At 3 wk following each of the 13 spinosad treatments, significant reductions in tick numbers on TG calves were observed on 61.2% of the 13 counting periods. Tick numbers obtained from six different sentinel groups of calves placed in pastures with the TG and untreated (UG) calves at various intervals indicated that spinosad treatments had an adverse impact on the field tick population. After the initial sentinel group was placed with the TG cattle, dramatic declines were observed in tick numbers on four of the five subsequent groups of sentinel cattle. Conversely, after the initial sentinel group was placed with the UG calves, steady increases in tick numbers were observed on four of the five subsequent groups of sentinel cattle.
Database assignments for author(s): Ronald B. Davey, Daniel E. Snyder, John E. George
Research topic(s) for pests/diseases/weeds:
control - general
Pest and/or beneficial records:
Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
---|---|---|---|---|
Rhipicephalus annulatus |