Sorption–desorption–penetration behavior of methyl bromide and sulfuryl fluoride in Mongolian scots pine ( <scp> <i>Pinus sylvestris</i> </scp> var. <scp> <i>mongolica</i> </scp> Litv.) logs under simulated fumigation

The two fumigants displayed distinct sorption-desorption-penetration profiles in P. sylvestris var. mongolica. MB demonstrated superior surface affinity and rapid desorption, making it suitable for targeting pests near the bark-cambium interface. SF achieved deeper diffusion but lower tissue concentrations, suggesting limited efficacy for short-duration treatments. These results highlight the importance of matching fumigant characteristics to pest location and substrate structure and provide a mechanistic basis for refining wood fumigation protocols in line with international phytosanitary standards. © 2025 Society of Chemical Industry.