How to Manage Pests

Pests in Gardens and Landscapes

Viral diseases

Loopers are often killed by a granulosis virus infection. The dead larvae turn black and become limp, often hanging from leaves. The body eventually disintegrates, releasing virus particles that readily spread to other larvae.

Looper infected with virus
Looper infected with virus

Dried-up larva
Dried-up larva
Hanging from leaf
Hanging from leaf

Statewide IPM Program, Agriculture and Natural Resources, University of California
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