Two erirhinid weevils (Coleoptera, Erirhinidae) know as rice pests new to Laos

2010·0.03 MB·

by  Kojima, Hiroaki

Elytra,Tokyo,38(2):226,November13,2010
Two Erirhinid Weevils (Coleoptera, Erirhinidae)
Known as Rice Pests New to Laos
Hiroaki KOJIMA, Junnosuke KANTOH and Shˆuji OKAJIMA
LaboratoryofEntomology,TokyoUniversityofAgriculture,
1737Funako,Atsugi,Kanagawa,243(cid:2)0034Japan
In the recent surveys conducted at and around pesticide-free rice paddies in northeastern
Laos, two erirhinid weevils belonging to the Erirhinini known as rice pests were collected. We
are goingto record them as the firstrepresentatives ofthistribe fromLaos.
TheauthorsthankMr.H.W6@6=6G6andhisfamilyfortheirarrangementofthefieldtrips
inLaos.ThisstudyissupportedbyKAKENHI(21405019; head investigator: S.O@6?>B6).
1. Notarisoryzae (IH=>96,1902)
Specimens examined. 67exs., Ban Muang (alt. 1,450 m) and Ban Om (alt. 1,162 m),
XiengkhouangProv.,1(cid:2)4(cid:2)V(cid:2)2008,H.KD?>B6&J.K6CID=;170exs.,BanNasala(alt. 1,372
m)andBanDon(alt. 1,111m),HouaphanProv.,14(cid:2)16(cid:2)VI(cid:2)2009,H.KD?>B6.
Distribution. Japan, Korea, NEChina,RussianFarEast, Laos.New to Laos.
Comments. Though the weevil was originally described as a pest of rice and the larva is
root-feeder (IH=>96, 1902a,b), it is presently not so common in rice paddies in Japan
(MDG>BDID, 1984). In northeastern Laos, however, it is quite common on footpaths between
rice fields and ridges of small river channelsadjacent to rice paddiesinmountainvillages. The
pest status isuncertain at present inLaos.
2. EchinocnemusbipunctatusRD:AD;H,1874
Specimensexamined. 8exs.,BanMuang(alt.1,450m),XiengkhouangProv.,1(cid:2)V(cid:2)2008,H.
KD?>B6;54exs.,BanNaMuang(alt.633m),BanNasala(alt.1,372m)andBanDon(alt.1,111
m),HouaphanProv.,11(cid:2)16(cid:2)VI(cid:2)2009,H.KD?>B6;10exs.,MuangKhamHotSpring(alt.567
m),XiengkhouangProv.,18(cid:2)VI(cid:2)2009,H.KD?>B6.
Distribution. Japan, SEChina,Laos,Java. New to Laos.
Comment. Local farmers recognize this weevil as a pest of rice, but the damage is not so
seriousconstantly.
References
IH=>96, M., 1902a. Pest of rice, Nekui-zoumushi (new name). Hokkaidˆo Nˆokaihˆo, Sapporo, 2: 7(cid:2)12. (In
Japanese.)
(cid:3)(cid:3)(cid:3)(cid:3)1902b. Scientificnameofricepest,Nekui-zoumushi.Ibid.,2:90.(InJapanese.)
MDG>BDID,K.,1984. Curculionidae.InH6N6H=>,M.,K.MDG>BDID&S.K>BDID(eds.),TheColeoptera
ofJapaninColor,4:269(cid:2)345,pls.53(cid:2)68.Hoikusha,Osaka.(InJapanese,withEnglishbooktitle.)