The practice of using fumigants to control internal decay has been widely accepted in the United States and has shown to be effect in control internal decay in transmission poles and other large wood timbers. Mathematical models were developed to simulate the chloropicrin movement in utility poles after treatment. The simulation results indicated that treatment of utility poles, using either traditional remedial treatment procedures or center-bore application procedures could provide long-term effectiveness in terms of eliminating existing infection and preventing further fungal attack. Controlled-release technology used in fumigant treatment was also shown to be potentially useful to reduce chemical usage and extend the protection period.

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