Lime Swallowtail by Tarique Sani,
SANIsoft, Bugwood.org

The citrus industry is of significant economic importance to the US, so when any potential pest appears on the horizon there is cause for concern. When the lime swallowtail (Papilio demoleus) was found in the Caribbean in 2006, scientists realised that it may only be a matter of time before these strong fliers appear in America. To try and keep one flight ahead of this zesty pest, scientists have come up with a rather neat solution.