In 1982, a new species of psyllid, Cardiaspina jerramungae, reached outbreak levels on Eucalyptus occidentalis. The primary host species grows in remnant stands in the Lower Great Southern region of Western Australia and until this event was not recognised to be associated with insect outbreaks. Herbarium specimens, a largely unexploited source of data for temporal and spatial history of ecological interactions between plant hosts and insect herbivores, provided evidence of historical insect outbreaks. Evidence of C. jerramungae was traced through herbarium specimens of the preferred hosts, E. occidentalis and Eucalyptus utilis. The earliest evidence of this insect was found on a 1901 specimen of E. occidentalis. There was also evidence of a high population in 1960. Further outbreaks of C. jerramungae are likely, with consequences for the health of its primary host, although their periodicity and duration are unpredictable.

中文翻译：

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植物标本室标本提供了西澳大利亚州下大南部的西洋桉树暴发的硬皮Cardiaspina jerramungae（半翅目：Psylloidea，Aphalaridae）的历史证据。

1982年，一种新的木虱科硬皮虫（Cardiaspina jerramungae）在西方桉树上达到了暴发水平。主要寄主物种生长在西澳大利亚州下大南部地区的残余林分中，直到这一事件被认为与昆虫暴发无关。植物标本室的标本是植物寄主与昆虫食草动物之间生态相互作用的时空历史数据，在很大程度上尚未得到利用，它为昆虫历史爆发提供了证据。通过首选寄主E. occidentalis和Eucalyptus utilis的标本室标本可以追溯到C. jerramungae的证据。该昆虫的最早证据发现于1901年的标本中E. occidentalis。也有证据表明1960年有大量人口。尽管有其周期性和持续时间无法预测，但可能进一步爆发了C. jerramungae，并对其主要寄主的健康造成了影响。