In vitro selection of fungicides for control of leaf blight of sweet persimmon tree caused by Pestalotiopsis theae

In vitro에서 단감나무 둥근갈색무늬병 방제를 위한 살균제 선발

  • Chang, T.H. (Dae Yu Co., Ltd. Research Institute of Plant Nutrition) ;
  • Lim, T.H. (Dae Yu Co., Ltd. Research Institute of Plant Nutrition)
  • 장태현 ((주)대유 식물영양연구소) ;
  • 임태헌 ((주)대유 식물영양연구소)
  • Published : 2001.12.31

Abstract

In vitro experiments, several fungicides including prochloraz, tebuconazole, fluazinam, fludioxonil, and iminoctadine-triacetate showed more than 85% inhibition of mycelial growth of Pestalotiopsis theae (SP-3). Dichlofluanid and chlorothalonil inhibited mycelial growth at the rate of 10 and 33%, however benomyl did not inhibit mycelial growth of the fungus. Minimum inhibitory concentration(MICs) of iminictadine-triacetate on the mycelial growth of SP-3 isolate was $10{\mu}g/m{\ell}$, but that of P. theae $\underline{MAFF}$ 752002 and P. longiseta $\underline{MAFF}$ 752001 was $1{\mu}g/m{\ell}$. MIC of benomyl, chlorothalonil, dichlorofluanid was $1,000{\mu}g/m{\ell}$, and that of fludioxonil, fluazinam, tebuconazole was $10{\mu}g/m{\ell}$. Conidial germination was inhibited more than 80% in tile medium which contained $1{\mu}g/m{\ell}$ of prochloraz, tebuconazole, fluazinam, fludioxonil, and minoctadine-triacetate. Control values of benomyl, chlorothalonil and dichlofluanid were 40, 60 and 30%, respectively. The controlling effect of iminoctadine-triacetate ($10{\mu}g/m{\ell}$) aganist P. theae (SP-3) in leaf disc test was more than 93%, but benomyl and dichlofluanid could not control leaf blight disease caused by P. theae (SP-3). Tebuconazole, fluazinam, fludioxonil, and iminoctadine-triacetate showed more than 94% of protective and curative effect of leaf blight of sweet persimmon, while, benomyl and dichlofluanid did not show any control effect of the disease.

Keywords

Pestalotiopsis theae(SP-3);prochloraz;tebuconazole;benomyl;dichlofluanid;fluazinam;fludioxonil;iminoctadine-triacetate