Olfactory Responses of <i>Frankliniella occidentalis</i> and <i>Orius similis</i> to Volatiles from <i>Houttuynia cordata</i>: Implications for Thrip Management
Thrips can be attracted or repelled by volatiles from different host plant species. <i>Houttuynia cordata</i> is a common plant species with a strong, offensive smell, and few pests have been detected on this plant. Here, the olfactory responses of <i>Frankliniella occidentalis<...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
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| Series: | Plants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2223-7747/14/12/1855 |
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| Summary: | Thrips can be attracted or repelled by volatiles from different host plant species. <i>Houttuynia cordata</i> is a common plant species with a strong, offensive smell, and few pests have been detected on this plant. Here, the olfactory responses of <i>Frankliniella occidentalis</i> to <i>H. cordata</i> volatiles were tested using electroantennography (EAG) and behavioral bioassays in different types of olfactometers, and the behavioral responses of <i>Orius similis</i>, a natural enemy of <i>F. occidentalis</i>, to the related main volatile compounds were also evaluated. Y-tube olfactometer bioassays showed that <i>F. occidentalis</i> performed negative responses to <i>H. cordata</i> volatiles. Decanal (47.21%), 1-decanol (11.02%), dodecanal (7.13%), <i>β</i>-myrcene (5.12%), and decanoyl acetaldehyde (3.76%) were the more abundant components in the <i>H. cordata</i> volatile profile in gas chromatography–mass spectrometry analysis. EAG recordings showed that the antennae of female thrips could perceive these five compounds at a wide range of concentrations. In six-arm olfactometer bioassays, <i>F. occidentalis</i> exhibited negative responses to decanal, dodecanal, and decanoyl acetaldehyde at various doses but performed positive responses to 1-decanol and <i>β</i>-myrcene at certain doses. Furthermore, decanal, dodecanal, and decanoyl acetaldehyde at all concentrations showed no significant influences on the behavioral responses of <i>O. similis</i>. According to the results above, <i>H. cordata</i> can be a repellent plant species to <i>F. occidentalis</i>, and decanal, dodecanal, and decanoyl acetaldehyde show great potential for development as repellents for the control of <i>F. occidentalis</i>. In short, our results suggest that an integrated pest management system combining <i>H. cordata</i>-derived biopesticides with releases of the predator <i>O. similis</i> could effectively control <i>F. occidentalis</i>. |
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| ISSN: | 2223-7747 |