Warmer weather brings multitudes of largest and noisiest varieties to east coast, with some as loud as 120 decibels
The sound of summer … green grocer cicadas emerged in huge numbers in the Blue Mountains in September and are now making their appearance in Sydney and parts of Victoria.The sound of summer … green grocer cicadas emerged in huge numbers in the Blue Mountains in September and are now making their appearance in Sydney and parts of Victoria.
Dr Lindsay Popple, a cicada researcher, said early observations and the warmer weather indicated a “pretty big summer for cicadas”.Green grocers were usually one of the earliest, he said. “Then you get this wave of all the other species coming out. Between Christmas and New Year over the eastern seaboard, that’s a peak time for cicadas.”
The insects produced their pulsating chorus by expanding and contracting a flexible organ called a tymbal, a sound amplified by their body structure, he explained. “In big numbers, they’re incredibly acoustically conspicuous.”Acoustic consultant Christophe Delaire, the CEO of Marshall Day Acoustics, said research found cicada noise measured at 50cm could range from the high 70s to above 100dB.
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