Abstract
The larva of Pimpla turionellae L. discharges an anal secretion, which acts as an inhibitor of the DOPA-tyrosinase reaction and, simultaneously, has antibiotic effects against bacteria and fungi. Hypertrophied Malpighian tubes and portions of the hindgut are involved in production, temporal storage and ejection of the fluid. The chemical composition of the secretion is complex, comprising acid mucopolysaccharides (hyaluronic acid), which are produced by the Malpighian tubes, and nitrogenous compounds, the source of which may be mainly the glandulous ileum. Tyrosinase inhibition is mediated by the product of the Malpighian vessels, while inhibition of Beauveria spore germination is exerted by the contents of Malpighian tubes and hindgut tissue as well.
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