Effects of Fluctuating Thermal Regimes and Pesticides on Egg Hatching of a Natural Enemy <i>Harmonia axyridis</i> (Coleoptera Coccinellidae)
The harlequin ladybird, <i>Harmonia axyridis</i>, is a valuable asset in integrated pest management (IPM); however, issues related to low-temperature storage and transportation have resulted in low hatching rate, while the use of pesticides may lead to non-target effects against this nat...
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MDPI AG
2023-05-01
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| Series: | Agronomy |
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| Online Access: | https://www.mdpi.com/2073-4395/13/6/1470 |
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| author | Jingya Yu Chong Li Likun Dong Runping Mao Zhihua Wang Zhangxin Pei Letian Xu |
| author_facet | Jingya Yu Chong Li Likun Dong Runping Mao Zhihua Wang Zhangxin Pei Letian Xu |
| author_sort | Jingya Yu |
| collection | DOAJ |
| description | The harlequin ladybird, <i>Harmonia axyridis</i>, is a valuable asset in integrated pest management (IPM); however, issues related to low-temperature storage and transportation have resulted in low hatching rate, while the use of pesticides may lead to non-target effects against this natural enemy during field application. Fluctuating thermal regimes (FTR) have been shown to be beneficial during the low-temperature storage, and the type and concentration of insecticides used are crucial for field application of <i>H. axyridis</i>. Despite this, little research has been conducted on the effects of FTR on the hatching rate of ladybird eggs, and the impact of pesticides on their egg viability remains unclear. To address these gaps, we investigated the effects of different thermal temperatures, recovery frequencies (the number of changes in temperature conditions per unit time), and recovery durations (the duration of the treated temperature condition) on egg hatching under constant low-temperature conditions. We also examined the toxicity and safety of seven commonly used insecticides on egg hatching. Our results indicate that the temperature during FTR application did not significantly affect egg hatching, but the interaction between temperature and recovery frequency can significantly affect egg hatching. Moreover, the recovery frequency and recovery duration had a significant impact on hatching. Under specific conditions, the hatching rate of eggs subjected to FTR was similar to that of eggs stored at 25 °C. Furthermore, we found that matrine (a kind of alkaloid pesticide isolated from <i>Sophora flavescens</i>) had low toxicity to ladybird eggs and is a safe pesticide for use in conjunction with this natural enemy. The study provides valuable information on effectively managing <i>H. axyridis</i> by taking into account both storage temperature and pesticide exposure. |
| first_indexed | 2024-03-11T02:53:05Z |
| format | Article |
| id | doaj.art-ad7974cb272d4496831e01cfe36cb446 |
| institution | Directory Open Access Journal |
| issn | 2073-4395 |
| language | English |
| last_indexed | 2024-03-11T02:53:05Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Agronomy |
| spelling | doaj.art-ad7974cb272d4496831e01cfe36cb4462023-11-18T08:53:43ZengMDPI AGAgronomy2073-43952023-05-01136147010.3390/agronomy13061470Effects of Fluctuating Thermal Regimes and Pesticides on Egg Hatching of a Natural Enemy <i>Harmonia axyridis</i> (Coleoptera Coccinellidae)Jingya Yu0Chong Li1Likun Dong2Runping Mao3Zhihua Wang4Zhangxin Pei5Letian Xu6Institute of Plant Protection, Wuhan Institute of Landscape Architecture, Wuhan 430022, ChinaState Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, ChinaInstitute of Plant Protection, Wuhan Institute of Landscape Architecture, Wuhan 430022, ChinaInstitute of Plant Protection, Wuhan Institute of Landscape Architecture, Wuhan 430022, ChinaInstitute of Plant Protection, Wuhan Institute of Landscape Architecture, Wuhan 430022, ChinaInstitute of Plant Protection, Wuhan Institute of Landscape Architecture, Wuhan 430022, ChinaState Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, ChinaThe harlequin ladybird, <i>Harmonia axyridis</i>, is a valuable asset in integrated pest management (IPM); however, issues related to low-temperature storage and transportation have resulted in low hatching rate, while the use of pesticides may lead to non-target effects against this natural enemy during field application. Fluctuating thermal regimes (FTR) have been shown to be beneficial during the low-temperature storage, and the type and concentration of insecticides used are crucial for field application of <i>H. axyridis</i>. Despite this, little research has been conducted on the effects of FTR on the hatching rate of ladybird eggs, and the impact of pesticides on their egg viability remains unclear. To address these gaps, we investigated the effects of different thermal temperatures, recovery frequencies (the number of changes in temperature conditions per unit time), and recovery durations (the duration of the treated temperature condition) on egg hatching under constant low-temperature conditions. We also examined the toxicity and safety of seven commonly used insecticides on egg hatching. Our results indicate that the temperature during FTR application did not significantly affect egg hatching, but the interaction between temperature and recovery frequency can significantly affect egg hatching. Moreover, the recovery frequency and recovery duration had a significant impact on hatching. Under specific conditions, the hatching rate of eggs subjected to FTR was similar to that of eggs stored at 25 °C. Furthermore, we found that matrine (a kind of alkaloid pesticide isolated from <i>Sophora flavescens</i>) had low toxicity to ladybird eggs and is a safe pesticide for use in conjunction with this natural enemy. The study provides valuable information on effectively managing <i>H. axyridis</i> by taking into account both storage temperature and pesticide exposure.https://www.mdpi.com/2073-4395/13/6/1470fluctuating thermal regimepesticide<i>Harmonia axyridis</i>egg hatching |
| spellingShingle | Jingya Yu Chong Li Likun Dong Runping Mao Zhihua Wang Zhangxin Pei Letian Xu Effects of Fluctuating Thermal Regimes and Pesticides on Egg Hatching of a Natural Enemy <i>Harmonia axyridis</i> (Coleoptera Coccinellidae) Agronomy fluctuating thermal regime pesticide <i>Harmonia axyridis</i> egg hatching |
| title | Effects of Fluctuating Thermal Regimes and Pesticides on Egg Hatching of a Natural Enemy <i>Harmonia axyridis</i> (Coleoptera Coccinellidae) |
| title_full | Effects of Fluctuating Thermal Regimes and Pesticides on Egg Hatching of a Natural Enemy <i>Harmonia axyridis</i> (Coleoptera Coccinellidae) |
| title_fullStr | Effects of Fluctuating Thermal Regimes and Pesticides on Egg Hatching of a Natural Enemy <i>Harmonia axyridis</i> (Coleoptera Coccinellidae) |
| title_full_unstemmed | Effects of Fluctuating Thermal Regimes and Pesticides on Egg Hatching of a Natural Enemy <i>Harmonia axyridis</i> (Coleoptera Coccinellidae) |
| title_short | Effects of Fluctuating Thermal Regimes and Pesticides on Egg Hatching of a Natural Enemy <i>Harmonia axyridis</i> (Coleoptera Coccinellidae) |
| title_sort | effects of fluctuating thermal regimes and pesticides on egg hatching of a natural enemy i harmonia axyridis i coleoptera coccinellidae |
| topic | fluctuating thermal regime pesticide <i>Harmonia axyridis</i> egg hatching |
| url | https://www.mdpi.com/2073-4395/13/6/1470 |
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