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If you don't want to replace your cannas, be sure to completely remove leaves and stems when frost kills them.
trichogramma wasps are the natural solution..
LeeAnn - Cannas will survive winter MOST of the time...but if you want to be sure about them, dig them in the next few weeks, chop off the stem/leaves and store indoors.
Martha - Trichogramma wasps seem to control leafrollers in greenhouse situations but don't do a very good job outdoors.