Modification of the food and agriculture organization larval packet test to measure amitraz-susceptibility against ixodidae
Modifications of exposure time, substrate, and formulation were made to the Food and Agriculture Organization Larval Packet Test (LPT) to determine a combination suitable for measuring the susceptibility of Boophilus microplus (Canestrini) to amitraz. Exposure time influenced the slope of the dose-r...
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Published in | Journal of medical entomology Vol. 39; no. 4; p. 645 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
England
01.07.2002
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Abstract | Modifications of exposure time, substrate, and formulation were made to the Food and Agriculture Organization Larval Packet Test (LPT) to determine a combination suitable for measuring the susceptibility of Boophilus microplus (Canestrini) to amitraz. Exposure time influenced the slope of the dose-response when paper was used as a substrate for amitraz. However, time did not influence the dose-response slope when nylon fabric was used as an amitraz substrate. Formulated amitraz produced results with less deviation from the log-probit model than technical amitraz. The combination of formulated amitraz and nylon fabric as a substrate for amitraz produced results that best fit the log-probit model. The modified FAO procedure (formulated amitraz/nylon substrate combination) was used to assay a Brazilian strain of B. microplus and a Panamanian strain of Rhipicephalus sanguineus (Latreille). Resistance ratios (95% CI) of 26.3 (25.7-26.9) and 7.3 (5.5-9.9) were calculated for the B. microplus and R. sanguineus strains, respectively. A discriminating dose of 0.03% amitraz was determined for B. microplus. This technique will help to locate amitraz resistant tick populations, provide data for improved control practices, and aid in the discovery of resistance mechanisms through synergist studies and verification of molecular techniques. |
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AbstractList | Modifications of exposure time, substrate, and formulation were made to the Food and Agriculture Organization Larval Packet Test (LPT) to determine a combination suitable for measuring the susceptibility of Boophilus microplus (Canestrini) to amitraz. Exposure time influenced the slope of the dose-response when paper was used as a substrate for amitraz. However, time did not influence the dose-response slope when nylon fabric was used as an amitraz substrate. Formulated amitraz produced results with less deviation from the log-probit model than technical amitraz. The combination of formulated amitraz and nylon fabric as a substrate for amitraz produced results that best fit the log-probit model. The modified FAO procedure (formulated amitraz/nylon substrate combination) was used to assay a Brazilian strain of B. microplus and a Panamanian strain of Rhipicephalus sanguineus (Latreille). Resistance ratios (95% CI) of 26.3 (25.7-26.9) and 7.3 (5.5-9.9) were calculated for the B. microplus and R. sanguineus strains, respectively. A discriminating dose of 0.03% amitraz was determined for B. microplus. This technique will help to locate amitraz resistant tick populations, provide data for improved control practices, and aid in the discovery of resistance mechanisms through synergist studies and verification of molecular techniques. |
Author | Miller, Robert J Davey, Ronald B George, John E |
Author_xml | – sequence: 1 givenname: Robert J surname: Miller fullname: Miller, Robert J email: robert.miller@ndvecc.navy.mil organization: USDA-ARS Knipling-Bushland US Livestock Insects Research Laboratory, Kerrville, TX 78028, USA. robert.miller@ndvecc.navy.mil – sequence: 2 givenname: Ronald B surname: Davey fullname: Davey, Ronald B – sequence: 3 givenname: John E surname: George fullname: George, John E |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/12144297$$D View this record in MEDLINE/PubMed |
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SubjectTerms | Animals Biological Assay - methods Insecticide Resistance Insecticides - pharmacology Ixodidae - drug effects Larva Toluidines - pharmacology United Nations |
Title | Modification of the food and agriculture organization larval packet test to measure amitraz-susceptibility against ixodidae |
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