Abstract
The effect of mating disruption by the ground-surface application of 2-cm-long dispensers (mini-dispensers) of 2-butanol against the white grub beetle Dasylepida ishigakiensis Niijima et Kinoshita (Coleoptera: Scarabaeidae) was examined in sugarcane fields on the Miyako Island, Okinawa, Japan. Mating rates and male catches with sex pheromone traps were reduced to a low level comparable to that obtained from a conventional method in which rope dispensers (25 m) were hung at a height of ca. 30 cm along the sugarcane ridges. Both mating rates and male catches were reduced with increasing number of treated mini-dispensers. These results suggest that by using mini-dispensers the amounts of synthetic sex pheromone and plastic resin can be reduced to 1/10–1/5 and 1/6–1/3, respectively, of their conventional application with rope-type dispensers, without impairing the efficiency of mating disruption in this beetle. Furthermore, the amount of labor required for the application of this method is expected to be greatly reduced compared to the rope-type dispenser method.
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Acknowledgements
We thank Takashi Kuriwada of Kagoshima University for his statistical support. We also thank the late Hiroaki Oroku, former director of the Miyakojima branch of OPARC, for his kind support of our project. We also wish to thank Itsuki Futenma, Nobuaki Hokama, Takashi Uehara of OPARC, Masaki Kazeoka, Tsuyoshi Kyan, Shinya Yamashiro, Hiroaki Sunagawa of the Kônan Sisetu Kanri, and Yuko Shimizu of the Okinawa Prefectural Plant Protection Center, for their assistance with the field experiments. Thanks are also due to Fumiaki Mitsube, of the Okinawa Prefectural Miyako Agriculture, Forestry and Fisheries Promotion Center, for kindly providing photograph.
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Arakaki, N., Nagayama, A., Kijima, K. et al. Ground-surface application of pheromones through a mini-dispenser for mating disruption of the white grub beetle Dasylepida ishigakiensis (Coleoptera: Scarabaeidae). Appl Entomol Zool 52, 159–164 (2017). https://doi.org/10.1007/s13355-016-0462-z
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DOI: https://doi.org/10.1007/s13355-016-0462-z