The subfamily Pimplinae currently includes 1,686 worldwide species in 45 genera. 36 species in 16 genera have been recorded from South Korea. Among them, the genus Delomerista is a small sized group in the subfamily Pimplinae with 18 described species from palaearctic, nearctic, oriental regions. The South Korean Delomerista wes newly recorded for the first time from South Korea in this study. The genus Perithous is a small group in this subfamily with 17 species from palaearctic, nearctic, oriental regions. The taxonomic study of the South Korean Perithous was initiated by Kim (1955) reported one species, Perithous scurra (Panzer, 1804). The genus Xanthopimpla is a moderate size in the subfamily Pimplinae with 261 species from entire regions, except nearctic and ethiopia regions. The existing South Korean Xanthopimpla includes only one species, Xanthopimpla punctata (Fabricius, 1781). In this study, we report six unrecorded species, Delomerista mandibularis (Gravenhorst, 1829), Delomerista pfankuchi Brauns, 1905, Perithous albicinctus (Gravenhorst, 1829), Perithous townesorum (Gupta, 1982), Perithous speculator Haupt, 1954 and Xanthopimpla clavata Krieger, 1914 of subfamily Pimplinae from South Korea.

The Black pine bast scale, Matsucoccus thunbergianae is one of the most serious in black pine, Pinus thunbergii forests in Korea. Since this pest was first reported in Goheung, Korea in 1963, which is gradually spread into neighboring regions and now occurs in many regions of the southern and eastern part of the Korean peninsula. The monitoring for distribution of M. thunbergianae was able to observed by naked eye egg sacs and pupa of male on the host until now. Therefore, this monitoring was very difficult in the low density of M. thubergianae. This experiment was conducted to use simple and practical moving cross-shaped flat trap for monitoring of M. thunbergianae. The monitoring of M. thunbergianae using the device was carried out to southern regions of the Korean peninsula. The first emergence of male showed mid. March in Namhae and late march in Busan, Jinju and Pohang. The peak of emergence showed late March in Namhae and early April in the other regions. When the number of M. thunbergianae intermediate nymph showed 58~59, 11~44 and 8~25 on 39.25 ㎠ bark area of the black pine, Pinus thubergii for 1 week, the number of captured its male adult was 58~83, 67~488 and 1~55 on the moving cross-shaped flat trap (10× 13㎝), respectively. The low density of M. thunbergianae was some few the number of capture, but there were no significant difference in its high density. Also, the number of captured its male adult was no significant in the different color (yellow, red, white and blue) of the moving cross-shaped flat trap.

The most effective methods against pine wilt disease (Bursaphelenchus xylophilus, PWD), black pine bast scale (Matsucoccus thunbergianae), pine needle gall midge (Thecodiplosis japonensis) is the trunk injection of insecticides. The period of trunk injection that was considered with ecology and physiology of pests such as pine wilt disease, black pine bast scale and pine needle gall midge, was applied from Dec. to next Feb. and June, Dec. respectively. And there are differences in quantities of being injected chemicals to pine trees by the period of trunk injection. Thus, we investigated to prevent the effect of insecticides, to estimate the effect under the trunk injection of insecticides for pine trees against pests by the injecting period and time, boring site, opening and shutting of injection site. On Pinuns thunbergii, it was examined to figure out the effect of insecticides by the injecting period, twice a month on a sunny day around 10 AM from January to September. Injecting of insecticides was tested at a dose of 5ml per cm dbh of a pine tree after boring with hand drill at 50 cm high from the ground. As a result, abmectin 1.8% EC and phospamidon 50% SL were injected over 90% of mortalities from the end of January to the middle of March but as time goes by, injecting insecticides tended to decrease. To compare the volume of injecting insecticides in a day, between 10 AM and 2 PM on February 23rd, abamectin 1.8% EC was injected at a dose of 5ml per pine trees with micro pipette after boring with a drill machine at 50 cm high from the ground. As a result, injecting insecticide of a pine which was injected around 10 AM was completely injected and about 90% of the insecticide was injected in case of a pine that was injected around 2 PM. Trunk injection of insecticides was examined to figure out differences of the volume of injected insecticides before and after rain. There was no difference not only the rainfall but also the bored direction.

Trunk injection of nematicides is applied to prevent pine wilt disease(PWD). Although the trunk injection of nematicides is effective to PWD prevention, it is not effective to vector insects such as adults of M. alternatus and M. saltuarius. Thus, This study was investigated for the insecticidal activity and the effect of feeding deterrence by injecting to pine trees with acetamiprid. For screening effective nematicides, some insecticides were injected to pines on December 30th, 2008 and their insecticidal activities and feeding areas of M. alternatus and M. saltuarius were investigated in the insects breeding dishes (100× 40mm) where put on 1 to 2-year-old twig which was selected from injected pine trees in early June. As a result, insecticidal activity and feeding deterrence of acetamicprid were most effective. Feeding areas of M. alterantus adults, when tested with 1-year-old twig and 2-year-old twig of healthy pine trees, were 170.3±107.0 mm2 and 258.0±123.2 mm2 respectively. And Feeding areas of M. alterantus adults, when tested with 1-year-old twig and 2-year-old twig of pines injected at a dose of 0.3 ml per cm dbh of a pine tree with acetamiprid, were 57.7±72.3 mm2 and 65.7±51.2 mm2 respectively and their mortalities also were 0%, 28.6%. The feeding areas of M. alterantus adults tested with 1-year-old twig and 2-year-old twig of pine trees injected at a dose of 0.6 ml per cm dbh of a pine tree with acetamiprid, were not fed on it and the mortalities were 28.0%, 57.1% respectively. In case of the feeding areas of M. saltuarius adults, when tested with 1-year-old twig and 2-year-old twig of healthy pine trees, it was 112.±35.1 mm2 and 159.2±65.2 mm2 respectively. And the feeding areas of M. saltuarius adults, when tested with 1-year-old twig and 2-year-old twig of injected pine trees at a dose of 0.3 ml per cm dbh of a pine tree with acetamiprid were 0.61±0.0 mm2 and 8.1±12.4 mm2 and both mortalities were 23.1%. Although M. saltuarius adults, when tested with 1-year-old twig of a pine tree injected at a dose of 0.6 ml per cm dbh of a pine tree with acetamiprid, were not fed on it but M. saltuarius adults tested with 2-year-old twig of the same pine tree were 2.0±3.7 mm2 and their mortalities were 53.8%, 61.5% respectively. We investigated insecticidal activities, the effects of feeding deterrence of acetamiprid for vector insects where fed twigs of injected pines by stop up hole with a cork or not, and the trunk injection to pine trees at a dose of 0.5, 1 ㎖ per ㎝ dbh of a pine tree with acetamiprid on the early June. As a result, all of the vector insects were not fed and the feeding area was within 11 ㎟ and the mortality of M. alternatus was 70%.