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Abstract

The efficacy of an injectable microsphere formulation of ivermectin for control of B. annulatus was tested on 2 groups of 6 Hereford heifers held on separate 7-ha, tick-infested pastures in Texas, USA. Cattle in one pasture were injected subcutaneously in the neck with a controlled-release...

Author(s)
Miller, J. A.; Davey, R. B.; Oehler, D. D.; Pound, J. M.; George, J. E.; Ahrens, E. H.
Citation
Journal of Economic Entomology, 1999, 92, 5, pp 1142-1146
Abstract

A study was conducted at the USDA-ARS, Cattle Fever Tick Research Laboratory, Mission, Texas, USA, to determine the efficacy of a 0.05 and 0.1% microencapsulated permethrin formulation applied as a whole-body spray, in a standard dip vat, and in a laboratory bioassay against B. microplus on cattle. ...

Author(s)
Ahrens, E. H.; Davey, R. B.; George, J. E.; Hunter, J. S., III
Citation
Southwestern Entomologist, 1998, 23, 1, pp 25-30
Abstract

An 11.6% emulsifiable concentrate of phosmet (Prolate) was evaluated in a dipping vat to determine its stability and other characteristics pertaining to management of the product in a vat in which large numbers of cattle were processed (in Texas, USA). A separate trial was done to determine...

Author(s)
Ahrens, E. H.; Davey, R. B.; George, J. E.; Pemberton, J. R.
Citation
Southwestern Entomologist, 1995, 20, 3, pp 335-340
Abstract

A study was conducted to determine the efficacy of cyhalothrin and lambda-cyhalothrin as a whole-body spray and lambda-cyhalothrin as a pour-on application on cattle infested with B. microplus. A laboratory bioassay was also done with both spray formulations. Cattle were infested with all parasitic ...

Author(s)
Davey, R. B.; Ahrens, E. H.; George, J. E.
Citation
Journal of Economic Entomology, 1992, 85, 6, pp 2286-2290
Abstract

Four groups of cattle infested with B. microplus were each dipped in a different concentration of amitraz diluted from a 12.5% EC formulation to determine the efficacy and performance of the product in an 11 400 litre dipping vat. Except for the period when heifers were dipped, animals were...

Author(s)
George, J. E.; Davey, R. B.; Ahrens, E. H.; Pound, J. M.; Drummond, R. O.
Citation
Preventive Veterinary Medicine, 1998, 37, 1/4, pp 55-67
Abstract

The effectiveness of coumaphos (CoRal Flowable) applied by 3 different treatment methods (dipping vat, spray-dip and power spray) to cattle infested with parasitic stages (adult, nymphal and larval) of B. microplus was studied in Texas, USA. Both the number of ticks per calf and the index of...

Author(s)
Davey, R. B.; Ahrens, E. H.; George, J. E.
Citation
Journal of Agricultural Entomology, 1997, 14, 1, pp 45-54
Abstract

A study was done in Mission, Texas, to determine the efficacy of a 50% wettable powder (WP) amitraz formulation applied as a whole-body spray in a standard dip vat, and in a laboratory bioassay against B. annulatus on cattle. A study also was done at the King Ranch in Kleberg County, Texas, to...

Author(s)
Ahrens, E. H.; Davey, R. B.; George, J. E.; Cooksey, L. M.
Citation
Journal of Economic Entomology, 1989, 82, 3, pp 850-853
Abstract

The pyrethroid Bayticol (flumethrin) was tested as a pour-on and whole-body spray for the control of Boophilus annulatus on cattle in Texas. Each animal in the untreated, pour-on and spray treatment groups were infested with larvae, nymphs and adults at the time of treatment. Based upon the index...

Author(s)
Ahrens, E. H.; Davey, R. B.; George, J. E.; Cooksey, L. M.
Citation
Journal of Economic Entomology, 1988, 81, 4, pp 1133-1136
Abstract

Cattle infested with all parasitic life-stages of Boophilus microplus and B. annulatus were sprayed with 0.0125 or 0.025% active ingredient amitraz. The detachment pattern of engorged or partially engorged females indicated that both concentrations of amitraz caused premature detachment, with at...

Author(s)
Davey, R. B.; Ahrens, E. H.; George, J. E.
Citation
Preventive Veterinary Medicine, 1984, 2, 5, pp 691-698
Abstract

Laboratory and field studies were carried out in Texas to determine the residual effectiveness of a flowable formulation of coumaphos against larvae of Boophilus annulatus (Say) on cattle. Hair samples were taken 6, 12, 24 and 72 h and 7 days after cattle had been dipped in 0.12% coumaphos. Samples ...

Author(s)
Davey, R. B.; Ahrens, E. H.; Pemberton, J. R.
Citation
Southwestern Entomologist, 1983, 8, 3, pp 168-173

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