A study on Resistant Substance to Pine Needle Gall Midge Among Phenolic Compounds in Pine Needles

소나무류(類) 침엽내(針葉內)에 함유(含有)된 phenolic compounds 중 솔잎혹파리의 저항성(抵抗性) 물질(物質) 조사(調査)

  • Son, Doo-Sik (College of Agriculture, Kyungpook National Univ.) ;
  • Eom, Tae-Jin (College of Agriculture, Kyungpook National Univ.) ;
  • Seo, Jae-Durk (College of Agriculture, Kyungpook National Univ.) ;
  • Lee, Sang-Rok (Kyungpook Forest Envir. Institute)
  • Received : 1995.12.12
  • Published : 1996.09.30

Abstract

This study was carried out to study the resistant substances to pine needle gall midge and seasonal variation of phenolic compounds in pine needles among susceptible and resistant species to pine needle gall midge. Free and water soluble phenolic compounds contained in pine needles showed seasonal variations among pine species. But, catechol, vanillic acid and syringic acid including phenolic compounds showed no variation between pine species, even the amount of those component varied by the seasons. Salicylic acid in pine needles showed 140ppm in Pinus virginiana, 35ppm in Pinus thunbergii and 72ppm in hybrid pine, Pinus thunbergii${\times}$P. virginiana, but traces in Pinus densiflora on May and June, hatching season in larvae of pine needle gall midge. There was high level of salicylic acid in resistant species to pine needle gall midge but traces in susceptible species. As our previous researches, the necrosis rate of larvae of pine needle gall midge showed high level on the solution of phenolic compounds extracted from needles of P. virginiana and salicylic acid, and there was no gall formation in P. virginiana, so that salicylic acid in pine needles seems to have relation with those results. Therefore, it is estimated that salicylic acid is resistant substance to pine needle gall midge.

Acknowledgement

Supported by : 한국학술진흥재단