Distribution and Metabolism of a Juvenile Hormone Analogue within Colonies of the Red Imported Fire Ant13

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Abstract
The distribution and metabolism of the juvenile hormone analogue (JHA), 1-(4′-ethylphenoxy)-6,7-epoxy-3, 7-dimethyl-2-octene (R-20458) was studied in Solenopsis invicta Buren. The JHA was formulated in once refined soybean oil and fed to adult workers of small colonies. Adult workers retained the largest amount of the JHA compared to other stages throughout the experimental period. The level of JHA in the larvae increased to 7% through 36 h and then slowly declined. Pupae, queen, and egg stages received only traces of the radiolabel, most of which were metabolic products. The half-life of the JHA in these colonies never exceeded 2 days. Experiments designed to study the distribution of JHA fed to adults within an individual ant revealed that through 11 days over ½ the radiolabel remained in the crop. This radioactivity consisted primarily of metabolic products of the parent compound.

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