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Gregarization of the migratory locust Locusta migratoria (Orthoptera: Acrididae) and prompt control on a subtropical island in Okinawa, Japan

Published online by Cambridge University Press:  10 October 2012

Yuko Shimizu ,
Yudai Nishide ,
Seiji Tanaka ,
Masanori Murata ,
Naoshi Sikenbaru ,
Masahiko Yoza ,
Hirohumi Miyaguni  and
Yusuke Matayosi
Yuko Shimizu*
Affiliation:
Miyako Branch of the Okinawa Prefectural Plant Protection Center (MB-OPPC), Miyakojima, Okinawa906-0012, Japan
Yudai Nishide
Affiliation:
Locust Research Laboratory, National Institute of Agrobiological Sciences at Ohwashi, Tsukuba, Ibaraki305-8634, Japan
Seiji Tanaka
Affiliation:
Locust Research Laboratory, National Institute of Agrobiological Sciences at Ohwashi, Tsukuba, Ibaraki305-8634, Japan
Masanori Murata
Affiliation:
Irabu Branch of Miyakojima City, Miyakojima, Okinawa906-0592, Japan
Naoshi Sikenbaru
Affiliation:
Shimoji Island Airport Administrative Office, Miyakojima, Okinawa906-0507, Japan
Masahiko Yoza
Affiliation:
Irabu Factory of Miyako Sugar Manufacturing Co. Ltd, Miyakojima, Okinawa906-0592, Japan
Hirohumi Miyaguni
Affiliation:
Irabu Branch of Japan Agriculture Cooperative Okinawa, Miyakojima, Okinawa906-0592, Japan
Yusuke Matayosi
Affiliation:
Okinawa Prefectural Miyako Agriculture, Forestry and Fisheries Promotion Center, Miyakojima, Okinawa906-0012, Japan Present address:Okinawa Development and Promotion Bureau, Cabinet Office, Government of Japan, Tokyo 100-8914, Japan.
*
*E-mail: suzukiyk@pref.okinawa.lg.jp
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Abstract

Upsurges in the populations of the migratory locust Locusta migratoria (L.) occurred in July 2011 at the airport and in sugarcane fields on Shimoji Island, Okinawa, Japan. In sugarcane fields and pathways, dark-coloured nymphs at early instars marched and infested sugarcane leaves. The number of locusts was estimated as approximately 1.4 million. After prompt control by spraying insecticides, the locust populations decreased remarkably in size at the airport and in sugarcane fields. The locust populations at the airport restored gradually and dark-coloured nymphs similar in appearance to typical gregarious forms were found marching on paved roads at the end of August. Insecticides were sprayed again in early September over those areas at the airport where nymphs were abundant. The locust populations rapidly declined and only a few locusts were observed thereafter on the island before winter. These observations indicate the importance of constant monitoring and prompt action for the control of locusts. The seasonal life cycle of this locust species on this island was studied by regularly sampling the locusts in the field, which revealed that this locust species produces three generations per year with different overwintering stages.

Keywords

Locusta migratoriaShimoji Islandgregarizationlocust controldark-coloured nymph
Type
Research Paper
Information
International Journal of Tropical Insect Science , Volume 32 , Issue 3 , September 2012 , pp. 148 - 157
Copyright
Copyright © ICIPE 2012

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