Abstract
Previous reports have indicated that inactive compounds in extracts of the abdomen tips of females of Heliothis zea (Boddie) and H. virescens (F.) may mask the sex pheromone, preventing males from making normal responses to the extracts. Experimentation, including the assay of fractions of abdomen tip extracts that were separated by gas chromatography and subsequently recombined, failed to confirm the presence of such masking compounds.

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