Fig. 3.

Thermo-graphic image of the industrial scale wood sample in which there was a small number of Bursaphelenchus xylophilus that survived treatment at an internal wood temperature of 56 °C. The center cross-hair represents the temperature on the surface above one of the fiber optic probe readings. The other two temperatures show some of the variability in temperatures across the face of the sample. The scale bar on the right indicates the temperature range, from 25-60 °C. Note that the minimum temperature reading, indicated at the top left, was 37.1 °C.