Usage History of 'psyllid'

The following chart shows how frequently 'psyllid' appeared in printed materials over time. For example, the word 'psyllid' occurred 1 time in books in 1836 and 503 times in 2008. From 1836 to 2008, the word 'psyllid' was used a total of 23,358 times in books scanned by Google. See Reference: Google Ngram project.

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