Ochratoxin A: An antiinsectan metabolite from the sclerotia of Aspergillus carbonarius NRRL 369

  • Wicklow D
  • Dowd P
  • Alfatafta A
 et al. 
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Abstract

Ochratoxin A, a known mycotoxin with demonstrated toxicity to insects, has been isolated from the sclerotia of the fungus Aspergillus carbonarius NRRL 369. The sclerotia, harvested from a solid substrate fermentation of corn kernels at 28 degrees C, produced quantities of ochratoxin A exceeding 50 ppm/g dry weight of sclerotia. Evidence is presented that ochratoxin A accounts for the activity of the methanol extract against larvae of the detritivorous beetle Carpophilus hemipterus (Nitidulidae) (75% reduction in feeding rate) and corn ear worm Helicoverpa tea (50% mortality with 99% reduction in weight gain among surviving larvae) when incorporated into a pinto bean diet at levels less than those occurring naturally in the sclerotia

Author-supplied keywords

  • Aspergillus
  • MYCOTOXIN
  • fungus
  • ochratoxin A
  • toxicity

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Authors

  • D T Wicklow

  • P F Dowd

  • A A Alfatafta

  • J B Gloer

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