Abstract
The black cutworm, Agrotis ipsilon (Hufnagel), is a highly polyphagous species; therefore, the larvae are subjected to a wide variety of allelochemics. We have tested the hypothesis that some allelochemics may exert chronic effects on rate of growth, ingestion of food, utilization of food, and pupation. Growth and pupation were inhibited by p-benzoquinone. It inhibited growth by reducing ingestion. The reduced form of p-benzoquinone, hydroquinone, was not biologically active in our experiments. Duroquinone, a synthetic, inhibited survival, growth, and pupation. It inhibited growth by reducing ingestion, the efficiency of conversion of assimilated food, and the overall efficiency of conversion of ingested food. The biologically active concentrations were well within the range at which many allelochemics occur in plants.
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