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FIELD EVALUATION OF SPATIAL REPELLENCY OF METOFLUTHRIN-IMPREGNATED LATTICEWORK PLASTIC STRIPS AGAINST AEDES AEGYPTI (L.) AND ANALYSIS OF ENVIRONMENTAL FACTORS AFFECTING ITS EFFICACY IN MY THO CITY, TIEN GIANG, VIETNAM

Spatial repellency of metofluthrin-impregnated polyethylene latticework plastic strips against Aedes aegypti mosquitoes was evaluated. Analysis of environmental factors affecting the efficacy of these strips, such as room temperature, humidity, and house structure, was performed in a residential area in My Tho City, Tien Giang Province, Vietnam. Treatment with the strips at the rate of 1 strip per 2.6–5.52 m² (approximately 600 mg per 2.6–5.52 m²) reduced the collection of Ae. aegypti resting inside the houses for at least eight weeks. Multiple regression analysis indicated that both increase in the average room temperature and decrease in the area of openings in the rooms that were treated with the strips positively affected the spatial repellency of metofluthrin.

Received April 24, 2006. Accepted for publication July 28, 2006.

Acknowledgments: We express our deep gratitude to K. Watanabe (Sumika LifeTech Co., Ltd., Osaka, Japan) for providing the plastic samples. We also thank H. T. T. Tran (Pasteur Institute, Ho Chi Minh City, Vietnam) for assistance with the study.

Financial support: This study was supported by the Core University Program sponsored by the Japan Society for the Promotion of Science.

^* Address correspondence to Hitoshi Kawada, Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan. E-mail: vergiss{at}nagasaki-u.ac.jp

Authors’ addresses: Hitoshi Kawada and Masahiro Takagi, Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan. Tomonori Iwasaki, Yoshinori Shono, and Yasuyuki Katayama, Agricultural Chemicals Research Laboratory, Sumitomo Chemical Co., Ltd., Hyogo 665-8555, Japan. Luu Le Loan and Tran Khanh Tien, Pasteur Institute, Ho Chi Minh City, Vietnam. Nguyen Thi Nhu Mai, Tien Giang Preventive Medicine Center, My Tho City, Vietnam.

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