Abstract
ABSTRACTTopical application of AltozarTM†, at rates as low as 0.7 nanograms per aphid, caused severe morphological changes and prevented larviposition when applied to third instar Aphis craccivora, although treatment of other instars was less effective. Aphids which failed to reproduce contained fewer oocytes and embryos than untreated aphids, but enormous development of the embryos had occurred, and oocytes within these embryos also exhibited exaggerated development. The reproductive tract of treated aphids was distorted and non‐functional presumably due to pressare from the hyper‐developed embryos. The volume and mean nuclear size of the corpus allatum of treated aphids were significantly smaller than in untreated controls (newly‐moulted adults) and the effect of the chemical on the endocrine system is discussed. Neurosecretory staining revealed no difference between treated and untreated aphids.
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