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Both life stages were completely killed by CimeXa by 24 h, and EcoVia achieved total larval mortality within 1 h when they were initially immersed in the dusts and when they crawled across treated substrate. Larvae were killed faster than nymphs. Temporary immersion of A. americanum larvae and nymphs in aqueous suspensions of the dusts were less effective than exposure to the dusts applied dry. Larval and nymphal mortality associated with crawling on dried aqueous suspensions of the products was also not as strong as when the immature life stages crawled across substrate treated with dry dusts, and EcoVia was not more efficient than CimeXa. CimeXa and EcoVia can likely be used to protect cattle in a prophylactic context because silica gel does not degrade, and EcoVia might be effective at eliminating ticks that are feeding on cattle as well. We suggest that the two dust products be assessed for efficacy against other ixodid species, such as the southern cattle fever tick, Rhipicephalus microplus (Canestrini), which transmits the causal agents of babesiosis to cattle.<\/jats:p>","DOI":"10.1093\/jme\/tjaa054","type":"journal-article","created":{"date-parts":[[2020,3,24]],"date-time":"2020-03-24T16:57:48Z","timestamp":1585069068000},"page":"1516-1524","source":"Crossref","is-referenced-by-count":7,"title":["Lethal Effects of a Silica Gel + Thyme Oil (EcoVia) Dust and Aqueous Suspensions on Amblyomma americanum (Ixodida: Ixodidae) Larvae and Nymphs"],"prefix":"10.1093","volume":"57","author":[{"given":"Allan T","family":"Showler","sequence":"first","affiliation":[{"name":"Knipling-Bushland U.S. Livestock Insects Research Laboratory, USDA-ARS, Kerrville, TX"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bailee N","family":"Dorsey","sequence":"additional","affiliation":[{"name":"Department of Science, Schreiner University, Kerrville, TX"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ryan M","family":"Caesar","sequence":"additional","affiliation":[{"name":"Department of Science, Schreiner University, Kerrville, TX"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2020,3,24]]},"reference":[{"key":"2020090707135736400_CIT0001","doi-asserted-by":"crossref","first-page":"6","DOI":"10.1016\/j.vetpar.2014.03.006","article-title":"Acaricide resistance in cattle ticks and approaches to its management: the state of play","volume":"203","author":"Abbas","year":"2014","journal-title":"Vet. 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