| Functional response of a parasitoid Ganaspidium utilis （Hymenoptera： Eucoilidae） on the leafminer Liriomyza trifolii （Diptera： Agromyzidae） |
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| 作者姓名： | LEKHNATH KAFLE PO-YUNG LAI YIN-FU CHANG |
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| 作者单位： | [1]Department of Tropical Agriculture and International Cooperation, National Pingtung University of Science and Technology,Pingtung Hsien [2]Asian Vegetable Research and Development Center, Shanhua, Tainan, Taiwan, China |
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| 基金项目： | Acknowledgments The authors would like to express their thanks to Dr Ethel M. Vilalobos and Dr Larry Nakahara for donating and hand-carrying the parasitoids to Taiwan from Hawaii. Thanks are also due to the National Pingtung University of Science and Technology for offering scholarship and other supportive facilitates for this study. |
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| 摘 要： | Functional response of a solitary, larval-pupal endoparasitoid of Liriomyza leafminers, Ganaspidium utilis Beardsley, was estimated on Liriomyza trifolii Burgess at three temperatures （17℃, 25℃, 29℃ ） and host densities. A type Ⅱ random parasitoid equation （RPE） was used to estimate instantaneous search rate and handling time. The instantaneous search rate increased as temperature increased. All of the RPE regressions obtained for functional response of G. utilis at different temperatures were significant （P〈0.01）. The slope of RPE regression lines was lower across the temperatures. At 29±2℃, the maximum number of larvae parasitized was 7.8 per day. It decreased to 7.2 larvae parasitized at 25±2℃. At 17±2℃, no significant increment of parasitization was observed due to the host density increments. The estimated handling time was lowest at 17±2℃ and highest at 25 ± 2℃, respectively. The ability of G. utilis to find and parasitize L. trifolii over a wide range of temperatures makes them a good candidate for biological control of Liriomyza leafminers.
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| 关 键 词： | 功能反应 拟寄生物 胡蜂 膜翅目 |
| 收稿时间： | 2005-06-30 |
| 修稿时间： | 2005-06-30 |
Functional response of a parasitoid Ganaspidium utilis (Hymenoptera: Eucoilidae) on the leafminer Liriomyza trifolii (Diptera: Agromyzidae) |
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| Authors: | LEKHNATH KAFLE PO-YUNG LAI YIN-FU CHANG |
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| Institution: | Department of Tropical Agriculture and International Cooperation, National Pingtung University of Science and Technology, Pingtung Hsien, China;and Asian Vegetable Research and Development Center, Shanhua, Tainan, Taiwan, China |
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| Abstract: | Abstract Functional response of a solitary, larval‐pupal endoparasitoid of Liriomyza leafminers, Ganaspidium utilis Beardsley, was estimated on Liriomyza trifolii Burgess at three temperatures (17°C, 25°C, 29°C) and host densities. A type II random parasitoid equation (RPE) was used to estimate instantaneous search rate and handling time. The instantaneous search rate increased as temperature increased. All of the RPE regressions obtained for functional response of G. utilis at different temperatures were significant (P < 0.01). The slope of RPE regression lines was lower across the temperatures. At 29 ± 2 °C, the maximum number of larvae parasitized was 7.8 per day. It decreased to 7.2 larvae parasitized at 25 ± 2 °C. At 17 ± 2 °C, no significant increment of parasitization was observed due to the host density increments. The estimated handling time was lowest at 17 ± 2 °C and highest at 25 ± 2 °C, respectively. The ability of G. utilis to find and parasitize L. trifolii over a wide range of temperatures makes them a good candidate for biological control of Liriomyza leafminers. |
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| Keywords: | functional response Ganaspidium utilis host density Liriomyza trifolii random parasitoid equation temperature |
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