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The emission of volatile organic compounds (VOCs) from plants is associated with biotic and abiotic stress and depends on the plant species, organs, and developmental stage. Insects use VOCs to locate their host plants and their behavior is heavily influenced by the chemical profile of each at its current phenological stage. The brown marmorated stink bug  Halyomorpha halys  (Hemiptera: Pentatomidae) is a highly polyphagous pest that causes significant damage to tree, vegetable, and ornamental crops worldwide. The volatile profiles of five hosts of  H. halys  were compared for common substances to provide insight into this insect’s extreme polyphagy. Headspace collection of volatile substances was performed for five hosts of  H. halys  by gas chromatography – mass spectrometry (GC-MS), and their VOC profiles were compared. The results show that, although the volatile profiles of the host plants differ substantially, 13 out of the 68 identified compounds were shared. These results suggest that host recognition by  H. halys  is likely driven by a combination of attractive and possibly repellent compounds that work synergistically which is the first step toward decoding this pest’s polyphagous nature.

Headspace determination of the volatile organic compounds (VOCs) emitted by host plants of the brown marmorated stink bug Halyomorpha halys