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How to Manage Pests

Pests in Gardens and Landscapes

Viral diseases

Loopers are often killed by a viral disease called nuclear polyhedrosis. 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 killed by a virusLooper killed by a virus

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