Pupation lasts about 15 days. However, techniques used in evaluation of pesticide efficacy are ambiguous to the amount of control. With the increased Southern movement and quarantine pressures, a suitable chemical treatment is needed to contain CBT in its current range and insure clean transportation of nursery stock. Preliminary results of larval control are quite surprising. Well-timed applications of pyrethroids or organophosphates provide excellent control.
Timing is crucial.
The susceptibility to pesticides is found in the behavior of CBT larvae. During spring and fall months, the larvae are meticulous at cleaning out their galleries and maintaining the frass tube. During this behavior, the exposure to lethal and sub-lethal doses of pesticides happens frequently as larvae visit the outer bark. Recent studies have found that many pyrethroids and other chemical classes persist, at great lengths, in treated wood. Preliminary findings show a sub-lethal dose from a few of the compounds.