An assessment of radiative heating as a thermal treatment for invasive snakes in cargo

Authors

Fred Kraus, University of MichiganFollow
Randal S. Stahl, USDA-APHIS-Wildlife ServicesFollow
William Pitt, Nathional Zoological ParkFollow

Date of this Version

2017

Citation

INTERNATIONAL JOURNAL OF PEST MANAGEMENT, 2017 http://dx.doi.org/10.1080/09670874.2017.1293309

Comments

U.S. government work.

Abstract

The brown tree snake (Boiga irregularis) is invasive in Guam and presents a continuous threat of accidental export to new islands in outbound cargo. Current attempts to avoid that scenario rely primarily on canine teams to inspect outbound cargo and vehicles. In prior work, we showed that thermal fumigation could effectively elicit snake exit of cargo under conditions when free flow of air streams is feasible, but this method cannot work with tightly packed cargo. Here we show radiative heating can effectively induce snake exit from cargo refuges at temperatures of 44–48 C; however, we find passive solar heating of cargo to be unreliable in attaining sufficiently high temperatures for cargo sterilization. Although passive solar radiant heating proved unreliable, an active radiant-heating system has promise as a reliable means of treating tightly packed cargo. Times needed for treatment in a closed, controlled setting are sufficiently short that routine application of the method should provide no serious interruption of normal cargo-handling procedures.