Abstract
In 21 trap locations across South Australia Rhopalosiphum padi was the most commonly trapped species of cereal aphid. Metopolophium dirhodum (Walker) and Sitobion nr fragariae were rarely trapped at any of the locations other than the Waite Institute. The trap catches of R. padi peaked twice. The first, an autumn peak, began in late April and continued through until the end of May, coinciding with the production of alatoid nymphs in perennial grass pastures. The second, winter peak commenced in July and continued through to the end of sampling, coinciding with alatoid nymph production in annual volunteer grasses and wheat crops. M. dirhodum and S. nr fragariae had only one peak which occurred in winter-spring.
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