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BACKGROUND
How parasitoids distinguish hosts from non‐hosts remains an unknown question. Chouioia cunea Yang (Eulophidae) is an important fall webworm parasitoid that attacks many forest and agricultural pests. To study the differences in the chemical clues used by C. cunea to distinguish host and non‐host plants, we used gas chromatography–mass spectrometry (GC–MS) to identify volatile compounds...