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Annual Fluctuations in Population of the Pine Needle Gall Midge, Thecodiplosis japonensis, and its Parasitoids in Kyeongbuk Province, Korea  

Jeon, Mun-Jang (Department of Forest Resources, College of Life and Environment, Daegu University)
Shin, Sang-Chul (Division of Forest Diseases and Insect Pests, Korea Forest Research Institute)
Chung, Yeong-Jin (Division of Forest Diseases and Insect Pests, Korea Forest Research Institute)
Kim, Chul-Su (Division of Forest Diseases and Insect Pests, Korea Forest Research Institute)
Choi, Kwang-Sik (Division of Forest Diseases and Insect Pests, Korea Forest Research Institute)
Park, Il-Kwon (Division of Forest Diseases and Insect Pests, Korea Forest Research Institute)
Jang, Jeong-Won (Department of Forest Resources, College of Life and Environment, Daegu University)
Publication Information
Journal of Korean Society of Forest Science / v.95, no.3, 2006 , pp. 256-260 More about this Journal
Abstract
This study was conducted to investigate the effect of parasititoids on the density-fluctuation of the pine needle gall midge, Thecodiplosis japonensis. The density of T. japonensis and its parasitoids was observed by emergence trap in pine forest in Namsung-dong, Keumho-eup, Youngcheon-shi, Kyeongsangbuk-do, Korea, from 1986 to 2005. After 1987, density fluctuations of adults pine needle gall midge and its parasitoids showed similar trends and density of parasitoids was dependent on density of host population. Sex ratio of the pine needle gall midge, T. japonensis, was female-biased and had some variations in according to years. These trends were similar to those of parasitoid populations and sex ratio of Inostemma seoulis was more female-biased than that of I. matsutama. T. japonensis adults emerged in the field from May 16 to July 27 and the peak of emergence was between late May and early June. The adults of Inostemma matsutama emerged from May 16 to June 11 (peak between late May and early June), whereas those of Inostemma seoulis emerged from June 9 to July 27 (peak: late June).
Keywords
Pine needle gall midge; Thecodiplosis japonensis; parasitoid; Inostemma matsutama; Inostemma seoulis; emergence;
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