Bagworm, Thyridopteryx ephemeraeformis . Spindle-shaped bags hanging from the trees indicate infestation. The larvae carry the bags around with them as they feed. Serious infestation may result in partial or complete defoliation of a tree. The adult is a moth.
Winter is passed in the egg stage.
There is one generation a year. Larvae can be controlled by spraying with carbaryl, diazinon, spinosad, or Bacillus thuringiensis var. Consult the labels for dosage rates and safety precautions. Juniper webworm, Dichomeris marginelIa . Low juniper plants in particular are infested by the juniper webworm, which webs together the leaves and twigs.