Genus Trissolcus are considered as most effective natural enemy for control Pentatomid pests. Trissolcus japonicus (Ashmead) is native egg parasitoid of the brown marmorated stink bug, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) in Palearctic region. Nevertheless, identification of Palearctic Trissolcus species are still controversial because of morphological homogeneity such as Trissolcus semistriatus (Nees, 1834) and Trissolcus Kozlovi Ryakhovskii, 1975. This study reassessed Korean Trissolcus species diversity and provided DNA barcoding data using mitochondrial cytochrome c oxidase subunit I (COI) gene for 11 Korean Trissolcus species.

납작먹좀벌과(Platygasteridae)의 큰검정알벌속(Trissolcus)에 속하는 T. japonicus (Ashmead) (썩덩큰검정알벌, 신칭)이 과수원에서 과일 에 심한 피해를 일으키는 해충인 썩덩나무노린재의 알에 기생하는 것으로 확인되었고, 생물적 방제인자로써 가능성이 기대된다. 또한 천마큰검정 알벌(T. itoi Ryu)이 북쪽비단노린재 알을, 검은다리큰검정알벌(T. nigripedius Nakagawa)이 알락수염노린재 알을 숙주로 각각 기생하는 것이 확 인되었다. 동정을 위한 진단형질 및 영상자료와 한국에 분포하는 큰검정알벌속(Trissolcus)의 종들에 관한 숙주목록을 제공하였다.

2016년 5월부터 9월까지 노린재류의 알에 기생하는 기생봉을 탐색하는 과정에서 노린재목의 알을 거의 독점적인 숙주로 선택하는 측등판검정알벌아과(Telenominae)의 Trissolcus속 3종이 조사되었다. 천마큰검정알벌(Trissolcus itoi Ryu)이 북쪽비단벌레 알에서, 검은다리큰검정알벌(T. nigripedius Nakagawa)이 알락수염노린재 알에서, 국내 미기록종 인 T. japonicus (Ashmead) (= T. halyomorphae Yang)가 썩덩나무노린재 알에서 확인되었다. 2009년 중국에서 썩덩나무노 린재의 알 기생봉으로 확인된 T. japonicus (Ashmead)는 7월 하순에서 8월 상순 사이 전남 순천 및 구례에서 채집되었고, 관련정보와 함께 국내 미기록종으로 보고하며, 앞으로 이 기생봉은 북미 지역에 침입하여 문제를 일으키고 있는 썩덩나무노린재의 잠재적인 밀도조절인자로써 이용가능성을 검토할 필요가 있다.

The genus Trissolcus Ashmead is an egg parasitoid of the family Pentatomidae, of which species are used for biocontrol agents for sting bug pests. Until now, 8 species of Trissolcus were recorded from South Korea. In this study, two species, Trissolcus plautiae (Watanabe) and T. elasmuchae (Watanabe, 1954), are newly recognized from Korean peninsula. Diagnosis, photographs and key to species are provided.

Halyomorpha halys(Stål, 1855) (Hemiptera: Pentatomidae), also known as Brown Marmorated Stink Bug (BMSB), is a recent invasive pest in America and Europe. It originated from East Asia such as Korea, Japan, China, and Taiwan. Genus Trissolcus (Hymenoptera: Scelionidae) which is regarded as important species for biological control of H. halys, was described 6 species previously in Korea. But biology and taxonomic character of this genus is poorly known in Korea. Herein, we report two species from Korea, T. japonicus Ashmead, 1904 and T. plautiae Watanabe, 1954. We have investigated the morphological characters and COI sequence, and conducted an experiment about parasitic preference on BMSB's egg. Morphological key and picture of two species, and result of sequence investigation and experiment will be presented.

Trissolcus nigripedius Nakagawa and Telenomus gifuensis Ashmead (Hymenoptera: Scelionidae) are solitary egg parasitoids of Dolycoris baccarum L. (Hemiptera: Pentatomidae), a polyphagous seed-sucking bug of agricultural crops. Field examinations revealed that the two parasitoids are the most common species, but only a single species emerge from a host egg mass. To explain this observation we tested two hypotheses of interspecific host discrimination and asymmetry in competitive interaction between the two parasitoids. When provided with host eggs pre-parasitized by each other, both Tr. nigripedius and Te. gifuensis parasitized 94 and 100% of the host eggs without interspecific host discrimination, respectively. Interestingly, from the multiparasitized eggs irrespective of oviposition sequence, progeny of Te. gifuensis always survive better than Tr. nigripedius. Te. gifuensis is superior in immature competition probably due to shorter egg incubation period, hence progeny of Te. gifuensis become first instar faster than that of Tr. nigripedius. However, adult Tr. nigripedius is always superior competitor in possessing and guarding the host eggs even after oviposition against Te. gifuensis. Therefore, the asymmetry in competitive interaction between Tr. nigripedius and Te. gifuensis may explain the emergence of a single species from a host egg mass in the field in spite of no interspecific host discrimination.

From the surveys of 2005 and 2006 in Korea, Trissolcus nigripedius was found in four locations, i.e., Andong, Miryang, Namhae, and Suwon, and one of the major egg parasitoids of Dolycoris baccarum. T nigripedius was also found to parasitize two other soybean bugs, Riptortus clavatus and Piezodorus hybneri, from the field collection in 2005. Host acceptance behaviors of T. nigripedius consisting of drumming, oviposition, and marking were observed and compared on five species of soybean bugs. T. nigripedius showed the complete host acceptance behaviors on the eggs of D. baccarum, P. hybneri, and Halyomorpha halys. But T. nigripedius emerged only from the eggs of D. baccarum (96%) and P. hybneri (75%) after 24 hours of exposure. T. nigripedius did not mark on the eggs of R. clavatus and Nezara antennata during the observation of behavior, hence no egg deposition was made. However, T. nigripedius parasitized 20% and killed 30% of the eggs of R. clavatus when 24 hours were given for parasitization. T. nigripedius would be a potential biological control agent of D. baccarum and P. hybneri with ability of giving additional mortality on R. clavatus in soybean field.