Journal of Asia-Pacific Entomology

Korean Society of Applied Entomology (한국응용곤충학회)
권호 표지

Seasonal Development and Population Fluctuations of Arrowhead Scale, Unaspis yanonensis (Homoptera: Diaspididae), in Citrus Orchards in Jeju, Korea

  • Kim, Dong-Soon (Majors in Plant Resource Sciences & Environment, Cheju National University, The Research Institute for Subtropical Agriculture and Biotechnology) ;
  • Seo, Yon-Dong (Majors in Plant Resource Sciences & Environment, Cheju National University, The Research Institute for Subtropical Agriculture and Biotechnology) ;
  • Choi, Kyung-San (National Institute of Subtropical Agriculture, RDA.)
  • Published : 2007.12.31
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Abstract

Arrowhead scale, Unaspis yanonensis (Kuwana), feeds on the foliage, stems, and fruits of citrus trees, and causes tree dieback when heavy infestations occur. The objective of this study was to collect basic data to establish seasonal management strategies for U. yanonensis. The abundances of male nymphs and female adults were monitored in unsprayed citrus orchards. The overwintered females started to produce their progenies (1st gen.) from mid-May. The populations of the 1st nymphs in the 1st generation showed a bimodal occurrence pattern, with a 1st larger peak between late May and early June, and a 2nd smaller peak in June. The nymphs in the 2nd generation, which were laid from newly developed females, were observed from late July, and the 1st peak occurred in mid-August, followed by an obscure later peak (the 2nd peak) around late September. The numbers of live females for the overwintered populations began to decrease gradually from early June by the impact of the predacious Chilocorus kuwanae, as well as by natural mortality factors, and dropped to a low level in mid-July. When there were abundant predator attacks, the U. yanonensis female populations sharply decreased from early June and were almost nonexistent in July. New female adults (1st generation adults) appeared from late June and peaked in midJuly. The 2nd generation female adults, consequently, the overwintering generation, occurred from mid-September, and gradually increased to late October. Overall, these results will be useful in terms of management strategies for U. yanonensis in citrus orchards.

Keywords

References

  1. Adachi, I. and R. Korenaga. 1991. Fertility schedules of Unaspis yanonensis (Hemiptera: Diaspididae) in relation to daily temperature. Res. Popul. Ecol. 33: 57-68 https://doi.org/10.1007/BF02514574
  2. Blackburn, V.L. and DR Miller. 1984. Pests not known to occur in the United States or of limited distribution, No. 45: Arrowhead scale. 14pp. US Department of Agriculture, Animal and Plant Health Inspection Service, Beltsville, MD
  3. EPPO. 1989. EPPO data sheets on quarantine organisms: No. 176 Unaspis yanonensis (Kuwana). Bulletin OEPP/EPPO Bulletin 19: 721-724 https://doi.org/10.1111/j.1365-2338.1989.tb01168.x
  4. EPPO. 2004. Citrus: Good plant protection practice. Bulletin OEPP/EPPO Bulletin 34: 43-56 https://doi.org/10.1111/j.1365-2338.2004.00698.x
  5. Davis, E.E, S. French and R.C. Venette. 2005. Arrowhead scale, Unaspis yanonensis (Kuwana) (Hemiptera: Diaspididae). 30pp. CAPS PRA: Mini-risk assessment. Unite States
  6. Itioka, T., T. Inoue, T. Matsumoto and N. Ishida. 1997. Biological control by two exotic parasitoids: eight-year population dynamics and life tables of the arrowhead scale. Entomol. Exp. Appl. 85: 65-74 https://doi.org/10.1023/A:1003049531968
  7. Kim, D.-H., H.M. Kwon and K.-S. Kim. 2000. Current status of the in Cheju island. Korean J. Appl. Entomol. 39: 276-274. (in Korean with English abstract)
  8. Kim, D.H., K.S. Choi, J.W. Hyun, H.M. Kwon and H.C. Yiem. 2005. Development of technology improving control effect for scale pest using machine oil spray. pp. 572-578, in Annual research report for 2005, Ed. National Institute of Subtropical Agriculture. RDA., Jeju, Korea. (in Korean with English abstract)
  9. Korenaga R. 1983. The time of hatching and crawling speed of U. yanonensis (Homoptera: Coccidae) Jpn. J. Appl. Ent. Zool. 27: 308-310. (in Japanese with English abstract) https://doi.org/10.1303/jjaez.27.308
  10. Kuwana, I. 1923. Descriptions and biology of new or littleknown coccids from Japan. Imperial Plant Quarantine Station Bulletin (Japan) 3: 1-67. (in Japanese with English summary)
  11. Matsumoto, T., T. Itioka, T. Nishida and T. Inoue. 2003. Introduction of parasitoids has maintained a stable population of arrowhead scales at extremely low levels. Entomol. Exp.Appl. 106: 115-125 https://doi.org/10.1046/j.1570-7458.2003.00017.x
  12. Murakami, Y. 1970. A review of biology and ecology of Diaspine scales in Japan (Homoptera: Coccoidea). Mushi 43: 65-114. (in Japanese with English summary)
  13. NPQS (The National Plant Quarantine Service). 1999. An illustrated book for foreign pests on plants (in Korea). 190pp. NPQS, Anyang
  14. Ohkubo, N. 1978. Dispersal of the first instar mymphs of arrowhead scale, Unaspis yanonensis Kuwana in young citrus tree. Ho.(Chikugo City) 24: 151-153. (in Japanese with English summary)
  15. Ohkubo, N. 1980. Ecology and control of the arrowhead scale, Unapsis yanonensis Kuwana. Rev. Plant Prot. Res. 13: 1-11. (in Japanese with English summary)
  16. Okudai, S., R. Korenaga and Y. Sakagami. 1969. Studies on the seasonal appearance of each stage of the arrowhead scale, Unaspis yanonensis (I). Bull. Hort. Res. Sta., Japan, Ser. B 9: 199-220. (in Japanese with English summary)
  17. Okudai, S., R. Korenaga and Y. Ando. 1966. On the seasonal appearance of larva of the arrowhead scale, Unaspis yanonensis. Bull. Fruit Tree Res. Sta. B5: 149-162. (in Japanese with English summary)
  18. Sakagami, Y., R. Korenaga and S. Okudai. 1981. Studies on the autumnal appearance of larvae of the arrowhead scale, Unaspis yanonensis Kuwana: temperature as a factor for termination of the appearance of larvae. Bull. Fruit Tree Res. Sta. B8: 189-202. (in Japanese with English summary)
  19. Song, S., B. Huang, and M. Huang. 1990. On the population dynamics and integrated control of arrowhead scale. Acta Phytophylactica Sinica 17: 233-236. (in Chinese with English abstract)
  20. Takezawa, H. and 1. Aihara. 1962. On the type of appearence of the arrowhead scale larva in the first generation, with special reference to reason why two peaks appear. Jpn. J. Appl. Ent. Zool. 6: 208-215. (In Japanese with English summary) https://doi.org/10.1303/jjaez.6.208