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Bacillus thuringiensis as an organic control and a pesticide such as Sevin with the active ingredient of carbaryl as an inorganic control are ways of treating bagworm attacks on weeping cherry trees (Prunus pendula).

Specifically, treatment needs to begin before the bags reach 1/2 inch (0.5 millimeter) in size. It is most effective when applied between late May and mid-June and least effective as of midsummer. The foliage has to be given no more than a light misting. The silk string by which the bags attach to branch twigs can and should be removed to prevent limb girdling and dieback. Bags can be picked off when the tree suffers from a light infestation.

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Q: How do you control bagworms on weeping cherry trees?
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