The significance of the photo below is that the center willow oak is banded with the old style Tanglefoot and tarpaper band. This tree is not adversely affected by the cankerworms. There are four other willow oaks in the yard and one elm on the planting strip which is to the left of center.
Cankerworms do not like the winged elm, but all the four other willow oak trees which were banded with Bug Barrier are totally defoliated.
Also the city trees which were banded with Tanglefoot came through quite well last year (spring 2007). It is for these reasons that I prefer the Tanglefoot banding. It is still necessary that the traps be monitored throughout the season and especially in later March and very early April.