Effects of <i>Sitobion avenae</i> Treated with Sublethal Concentrations of Dinotefuran on the Predation Function and Enzyme Activity of <i>Harmonia axyridis</i>
This study investigated the impact of sublethal concentrations of dinotefuran on the predatory behavior and detoxification enzyme activity of <i>Harmonia axyridis</i>, aiming to establish a theoretical foundation for the conservation and utilization of natural enemies and the effective m...
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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: | Insects |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4450/16/7/671 |
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| Summary: | This study investigated the impact of sublethal concentrations of dinotefuran on the predatory behavior and detoxification enzyme activity of <i>Harmonia axyridis</i>, aiming to establish a theoretical foundation for the conservation and utilization of natural enemies and the effective management of wheat aphids. This study treated wheat aphids with sublethal concentrations (LC<sub>20</sub> and LC<sub>30</sub>) of dinotefuran via the leaf dipping method and subsequently used them as prey for the fourth-instar larvae of <i>H. axyridis</i>. The predation amount, instantaneous attack rate, handling time, daily maximum predation amount, and detoxification enzyme activity of <i>H. axyridis</i> were statistically analyzed. The results indicated that the predation of <i>H. axyridis</i> on wheat aphids conformed to the Holling II disc equation. Moreover, in comparison to the control group, the handling time of <i>H. axyridis</i> on wheat aphids was extended, and at the same time, the instantaneous attack rate, maximum daily predation amount, and predation efficiency were all diminished. After the ingestion of LC<sub>20</sub>- and LC<sub>30</sub>-dinotefuran-treated aphids, the carboxylesterase levels in <i>H. axyridis</i> were not significantly different from the control, with levels 0.97-fold and 0.94-fold that of the control, respectively. Glutathione-S-transferase (GST) demonstrated an induction impact compared to the control, reaching 1.96- and 1.47-fold higher than the control, respectively. The activity of mixed-functional oxidase (MFO) demonstrated an induction effect compared to the control, measuring 1.98- and 3.04-fold higher than that of the control, respectively. Consequently, the predation function and detoxification enzyme activity of <i>H. axyridis</i> were influenced when consuming wheat aphids treated with sublethal concentrations of dinotefuran, with significant variations across different concentrations, potentially reflecting the survival strategy of insects under dinotefuran stress. |
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| ISSN: | 2075-4450 |