Key to the tick's explosive spread and bloody blitzes is that its invasive populations tend to reproduce asexually, that is, without mating. Females drop up to 2,000 eggs over the course of two or three weeks, quickly giving rise to a ravenous army of clones. In one U.S. population studied so far, experts encountered a massive swarm of the ticks in a single paddock, totaling well into the thousands. They speculated that the population might have a ratio of about one male to 400 females. Yesterday, August 7, Maryland became the eighth state to report the presence of the tick. It followed a similar announcement last Friday, August 3, from Pennsylvania. Other affected states include New York, Arkansas, North Carolina, Virginia, and West Virginia.
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