Entomologists around Australia have noted declines in insect populations but the reasons why are unclear. It could be several factors including climate change, increased urbanisation and pesticide usage. Declines in insect populations are not just limited to Australia, but have been noted in other countries as well. Read more at:
https://www.abc.net.au/news/2018-02-24/decline-in-insect-population-baffles-scientists/9481136