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.
Similar content being viewed by others
References
Azuma S. (1974) Outbreaks in Locusta migratoria populations on Minami-Daito Island. Plant Protection 28, 71–74 (in Japanese).
Hunter-Jones P. (1958) Laboratory studies on the inheritance of phase characters in locusts. Anti-Locust Bulletin 29, 1–32.
Ito Y. and Yamagishi M. (1976) Outbreaks and partial phase transformation of Locusta migratoria L. in sugarcane fields of Minamiand Kita-Daito Zima, Okinawa. Acrida 5, 17–26.
Kiritani K. and Tanaka A. (1987) An outbreak of Locusta migratoria manilensis on Magesima Island. Insectarium 24, 44–54 (in Japanese).
Nakamori H. and Ito Y. (1974) Occurrence of Locusta migratoria phase transiens in Minami-Daito Island. Japanese Journal of Applied Entomology and Zoology 18, 5–8 (in Japanese).
Stower W. J., Davies D. E. and Jones I. B. (1960) Morphometric studies of the desert locust, Schistocerca gregaria (Forsk.). Journal of Animal Ecology 29, 309–339.
Takahashi S. (1986) Limited outbreak of the Asiatic locust Locust a migratoria L. (Orthoptera: Acrididae), in Tochigi Prefecture. Japanese Journal of Applied Entomology and Zoology 30, 17–20 (in Japanese).
Tanaka M. (1980) Reclamation and the migratory locust in Hokkaido. Insectarium 17, 242–251 (in Japanese).
Tanaka S. (1992) The significance of embryonic diapause in a Japanese strain of the migratory locust, Locusta migratoria (Orthoptera: Acrididae). Japanese Journal of Entomology 60, 503–520.
Tanaka H. (1994a) Geographic variation of embryonic diapause in the migratory locust, Locusta migratoria L. (Orthoptera, Acrididae), in Japan. Japanese Journal of Entomology 62, 629–639.
Tanaka S. (1994b) Diapause as a pivotal factor for latitudinal and seasonal adaptation in Locusta migratoria in Japan, pp. 173–190. In Insect Life-cycle Polymorphism (edited by De H. D. Danks). Kluwer Academic Publishers, London.
Tanaka S. (2000) Hormonal control of body-color polymorphism in Locusta migratoria: interaction between [His7]-corazonin and juvenile hormone. Journal of Insect Physiology 46, 1535–1544.
Tanaka A., Hara T., Nagashima Y., Ikeda K. and Ikeura M. (1987) Outbreak of the oriental migratory locust, Locusta migratoria Linné, in Mage Island in Kagoshima Prefecture. Plant Protection 41, 2–3 (in Japanese).
Tanaka A. and Kiritani K. (1987) An outbreak of Locusta migratoria manilensis on Magesima Island II: end of outbreak. Insectarium 24, 330–337 (in Japanese).
Tokuda M., Tanaka S. and Zhu D.-H. (2010) Multiple origins of Locusta migratoria (Orthoptera: Acrididae) in the Japanese Archipelago and the presence of two major clades in the world: evidence from a molecular approach. Biological Journal of the Linnean Society 99, 570–581.
Uvarov B. (1966) Grasshoppers and Locusts. Vol. 1. Cambridge University Press, London. 481 pp.
Uvarov B. (1977) Grasshoppers and Locusts. Vol. 2. Centre for Overseas Pest Research, London. 475 pp.
Yamagishi M. and Tanaka S. (2009) Overwintering biology and morphological characteristics of the migratory locust, Locusta migratoria after outbreaks on Iheya Island, Japan. Applied Entomology and Zoology 44, 165–174.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Shimizu, Y., Nishide, Y., Tanaka, S. et al. Gregarization of the migratory locust Locusta migratoria (Orthoptera: Acrididae) and prompt control on a subtropical island in Okinawa, Japan. Int J Trop Insect Sci 32, 148–157 (2012). https://doi.org/10.1017/S1742758412000239
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1017/S1742758412000239