Abstract
Four pseudoguaianolides, parthenin, helinalin, coronopilin and tenulin, were tested for their effects on survival of the confused flour beetle, Tribolium confusum. Tenulin had no significant effect in concentrations tested but the other three compounds significantly reduced survival of the beetles when present in food in concentrations higher than 3.0%. It is suggested that the α-methylene-γ-lactone moiety (absent in tenulin but present in the other three lactones) is responsible for the detrimental properties of selected pseudoguaianolides on survival of flour beetles, whereas the α-β-unsaturated ketone functionality (present in tenulin, parthenin, and helenalin)does not contribute to those properties.
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