Bagworm in Louisiana
MODERATEInsect
Bagworm is currently active in Louisiana. Watch your susceptible trees closely and act early.
About Bagworm
A moth whose larvae construct distinctive spindle-shaped bags from silk and foliage fragments. They feed on over 100 species of trees and shrubs, with conifers being most vulnerable since they cannot regrow lost foliage as readily.
Symptoms to watch for
Spindle-shaped silk bags 1-2 inches long hanging from branches, defoliation starting at the top of the tree, brown needles on conifers, bags incorporating dead plant material as camouflage
Trees at risk in Louisiana
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Treatment options
Hand-Picking Bags
Physical removal and destruction of bags from fall through early spring before eggs hatch. Effective on small to moderately infested trees and shrubs that are accessible.
Btk Spray on Young Larvae
Application of Bacillus thuringiensis var. kurstaki in late May through June when larvae have just hatched and are actively feeding outside their bags. Timing is critical.
Recommended Products & Tools
Helpful supplies for managing Bagworm. Always read and follow label directions, and confirm a diagnosis before treating.
Organic control that targets caterpillars when they're young.
Knocks down soft-bodied pests like aphids, mites, and scale crawlers.
Smothers overwintering eggs and crawlers; dormant or summer rates.
Soil-applied protection taken up by the tree for season-long control.
Sharp, clean cuts to remove affected wood — a tree-care essential.
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Need help with Bagworm in Louisiana?
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Browse all Louisiana arborists →Frequently asked questions
Is Bagworm in Louisiana?
Bagworm is currently active in Louisiana. Watch your susceptible trees closely and act early.
What does Bagworm look like?
Spindle-shaped silk bags 1-2 inches long hanging from branches, defoliation starting at the top of the tree, brown needles on conifers, bags incorporating dead plant material as camouflage
What trees does Bagworm affect in Louisiana?
It affects Eastern Red Cedar, Colorado Blue Spruce, Norway Spruce, American Holly, Common Boxwood. Susceptibility varies by species.
How do I treat Bagworm?
Options include: Hand-Picking Bags, Btk Spray on Young Larvae. Confirm the diagnosis before treating, and consider a certified arborist for high-value trees.