COMPOSITION CONTAINING RUMEX CRISPUS EXTRACT FOR CONTROLLING POWDERY MILDEW

摘要

PURPOSE: A composition containing an extract of Rumex crispus or Rumex japonicus obtained by extracting in methanol and then successively extracting in various organic solvents is provided. Therefore, the composition is effective in eradicating the causative agent of powdery mildew on crops such as Sphaerotheca fuliginea, Blumeria graminis. CONSTITUTION: Rumex crispus or Rumex japonicus is extracted in 80% methanol, the extract is concentrated under reduced pressure, dissolved in 80% methanol and extracted in hexane. Then, the extract is dissolved in 80% methanol, concentrated under reduced pressure, extracted in ethyl acetate and then concentrated under reduced pressure. The composition for controlling powdery mildew contains the extract in the range of 0.0037 to 0.3g/ml, preferably 0.011 to 0.3g/ml, based on the weight of raw material. For an example, the Rumex crispus or Rumex japonicus extract shows a control value of 60 to 100% against barley powdery mildew.