"Bags' are difficult to penetrate with sprays, though easier in early spring than later in the year. Handpicking may be the best means to remove the bagworms, especially in the early spring before eggs hatch.
Control sprays should begin around the first of June as eggs hatch and form new bags. Several applications may have to be made throughout the month. Make sure to read and follow all labeled directions.
See: Fall webworms, Eastern tent caterpillars
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