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1-liter beaker 20 percent 24 hours active ingredients ambient temperatures APHIS Average Boophilus annulatus Say brown dog tick cages of females cages were placed centimeters in diameter chlorvos consistently poor control control of Boophilus deer hide dichlorvos strips dipping tests eggs laid elapsed while gas engorged female Boophilus Engorged female ticks Estimated reproduction evaluated exposed false bottom female Boophilus spp females were placed formula fumigation drums fumigation tests gas for 15 gas traveled Gas3 grams hatch hour of exposure Insecticide inside the drums inspection killing all Boophilus level of control lids were secured MeBr gas metal hook methyl bromide microplus Canestrini minute elapsed Nuevo Laredo number ovipositing percent after 24 percent dichlorvos placed inside quarantine replication saturated NaCl solution second drum six cages slaughterhouse technical dichlorvos technical liquid technique for killing third drum total egg masses treatment trophies U.S. Department U.S. Livestock Insects untreated water vapors vials Weight of total