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Ecological Research

, 24:257 | Cite as

Pearl bodies of Cayratia japonica (Thunb.) Gagnep. (Vitaceae) as alternative food for a predatory mite Euseius sojaensis (Ehara) (Acari: Phytoseiidae)

  • Mayuko Ozawa
  • Shuichi Yano
Original Article

Abstract

On the young leaves, shoots, and buds of Cayratia japonica (Thunb.) Gagnep. (Vitaceae), we observed nutritious bodies called pearl bodies and hypothesized that they are utilized by generalist predators as alternative foods. Some ambulate organisms consume pearl bodies in the wild and the predatory mite Euseius sojaensis (Ehara) (Acari: Phytoseiidae) was considered as a primary candidate. Pearl bodies promoted E. sojaensis settlement on C. japonica leaves and E. sojaensis could prey on the phytophagous mite Tetranychus kanzawai Kishida (Acari: Tetranychidae) when the predators settle on a leaf before the prey. In addition, the presence of pearl bodies did not reduce predation of E. sojaensis on T. kanzawai. This was seemingly because food quality of T. kanzawai was higher than pearl bodies. These results implied that pearl bodies on C. japonica leaves are utilized by E. sojaensis as alternative foods.

Keywords

Pearl body Cayratia japonica Alternative food Euseius sojaensis Tetranychus kanzawai 

Notes

Acknowledgments

We thank Dr. A. Kasai for identification of E. sojaensis and Mr. T. Kawasaki for valuable suggestions. Dr. M. Fitz-Earle improved the manuscript. This study was partly supported by a funding from the development of new biorational techniques for sustainable agriculture and a Grant-in-Aid for the 21st Century COE program of Innovative Food and Environmental Studies Pioneered by Entomomimetic Sciences in Kyoto University.

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Copyright information

© The Ecological Society of Japan 2008

Authors and Affiliations

  1. 1.Laboratory of Ecological Information, Graduate School of AgricultureKyoto UniversityKyotoJapan

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