| 摘要 |
A fungicidal composition comprising bromophenol compounds isolated from Odonthalia corymbifera is provided to inhibit activity of isocitrate lyase(ICL), appressorium formation of Magnaporthe grisea, and infection of rice blast disease without side effects, so that the composition is useful for control of harmful fungi. A fungicidal composition for controlling Magnaporthe grisea comprises bromophenol compounds represented by the formula(1), isolated from Odonthalia corymbifera, wherein R1 and R2 are each independently hydrogen atom, hydroxy group or bromo group; R3 is C1-C6 linear or branched alkyl group, alkenyl group, alkynyl group or alkoxy group which is optionally substituted by R'; R' is hydrogen atom, hydroxy group, nitro, halogen, amine, C1-C4 lower alkyl, C1-C4 lower alkenyl group or C1-C4 lower alkoxy group; and the bromophenol compounds include 3,5-dibromo-4-hydroxyphenylethylamine, 2,2',3,3'-tetrabromo-4,4',5,5'-tetrahydroxydiphenylmethane, 2,3-dibromo-4,5-dihydroxybenzyl alcohol, 2,3-dibromo-4,5-dihydroxybenzyl methyl ether, 2,2',3-tribromo-3',4,4',5-tetrahydroxy-6'-hydroxymethyldiphenylmethane and 3-bromo-4-(2,3-dibromo-4,5-dihydroxybenzyl)-5-methoxymethylpyrocatechol. Further, the Magnaporthe grisea comprises Magnaporthegrisea, Bipolaris, Drechslera or Rhizoctonia solani(Mananporthe grisea). |
