Areal Distribution and Parasitism on Other Soybean Bugs of Trissolcus nigripedius (Hymenoptera: Scelionidae), an Egg Parasitoid of Dolycoris baccarum (Heteroptera: Pentatomidae)

Abstract

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