Nodai Entomology (4): 10-11 (2023)© Nodai Entomological Laboratory

An Occasional Journal of the Nodai Ent. Lab.

N ODAI E NTOMOLOGYISSN 2435-3965 (Online)

https://www.nodai.ac.jp/agri/original/konken/shigen/publication/publication.html

Occurrences of three pest weevils (Coleoptera, Curculionidae, Dryophthorinae)of banana on Hateruma-jima Island, the Yaeyama Islands, the Ryukyus,
southwestern Japan
Hiroaki KOJIMA
Laboratory of Entomology, Tokyo University of Agriculture, 1737 Funako, Atsugi, Kanagawa, 243-0034 Japan
E-mail: h3kojima@nodai.ac.jp

AbstractThree dryophthorine weevils pests of banana, Odoiporus longicollis (Olivier, 1807),
Cosmopolites sordidus (Germar, 1824) and Polytus mellerborgii (Boheman, 1838), were recorded for the firsttime from Hateruma-jima Is., the southernmost inhabited island of Japan belonging to the Yaeyama
Islands, the Ryukyus.
Currently three dryophthorine weevils, Odoiporus longicollis (Olivier, 1807), Cosmopolites sordidus(Germar, 1824) and Polytus mellerborgii (Boheman, 1838), have been found to attack banana trees insouthwestern Japan. They are widely distributed and established throughout the Nansei Islands, fromthe Yaeyama Islands in the south to the Satsunan Islands in the north, (the Ryukyus) (Sasaki et al., 2002;Kojima, 2023). All three are introduced species, mainly accompanying banana seedlings from Taiwan(Kohama & Takehara, 2002). Hateruma-jima Island, the southernmost inhabited island of Japan,
belongs to the Yaeyama Islands, and no pest weevils of banana were previously known from the island.
During a recent short survey, the author found the following three weevils on an injured bananatree (Fig. 1) at the same time from one location. This finding confirmed their occurrences on the island
for the first time. Additional surveys on Yonaguni-jima Island and the small islets of the Yaeyama
Islands are required in the future.
All of the specimens examined were collected near
Buribuchi Park on May 14th, 2023 by the author, and will bedeposited in the Laboratory of Entomology, Tokyo
University of Agriculture, Atsugi, Japan.
The author thanks Dr. Steven R. Davis (NodaiEntomology, Atsugi) for his critical reading of themanuscript and his university department supporting thetraveling fee.
1. Odoiporus longicollis (Olivier, 1807)
4 exs. (three specimens are a reddish brown form andone is black).
2. Cosmopolites sordidus (Germar, 1824)
1 ex.
Fig. 1. Standing but injured banana tree by
the three dryophthorine weevils (nearby
the Buribuchi Park, Hateruma-jima Is.).
Accepted 24 Sep 2023; published 2 Dec 2023
Licensed under a Creative Commons Attribution License CCBY 4.0

11Nodai Entomology, (4): 10-11

3. Polytus mellerborgii (Boheman, 1838)
1 ex.
要 約
⼩島弘昭：⼋重⼭諸島波照間島からのバナナの害⾍オサゾウムシ 3 種（甲⾍⽬ゾウムシ科オサゾウムシ亜科）の分布．̶̶̶̶ 波照間島から未記録であったバナナの害⾍オサゾウムシ（バナナツヤオサゾウムシ，バショウオサゾウムシ，バショウコクゾウムシ）を新たに記録した．
References
Kohama, T. & K. Takehara, 2002. Exotic insects in Okinawa. Bulletin of the Okinawa Prefectural Museum,Naha, (28): 55-92. (In Japanese, with English title.)
Kojima, H., 2023. [Records of dryophthorid weevils, that are important pests of banana from Ishigakijima Is. and Iriomote-jima Is.]. Sayabane, Tokyo, (n. ser.), (50): 46-47. (In Japanese.)
Sasaki, T., M. Kimura & F. Kawamura, 2002. Coleoptera. Pp. 157–284. In Azuma, S., M. Yafuso, M. Kinjô,M. Hayashi, T. Kohama, T. Sasaki, M. Kimura & F. Kawamura (eds.), Check List of the Insect of theRyukyu Islands. Flora and Fauna in Okinawa, (1) (Second edition). xxiv+570 pp. The BiologicalSociety of Okinawa, Nishihara. (In Japanese, with English title.)