Obviously, the ecological carrying capacity for native insects has fallen
off a cliff over the past 20 years or so.  Pesticides and habitat
fragmentation at first appear to be appealing suspects - but studies have
taken place in ecological reserves, not in fragmented habitat influenced by
pesticides.

The native insects are experiencing massive declines in biodensity - the
famous German Study demonstrated 75% declines in flying insect populations .
 https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0185809
<https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0185809>


https://www.pnas.org/content/114/30/E6089#:~:text=We%20describe%20this%20as%20a,population%20extinctions

*Dwindling population sizes and range shrinkages amount to a massive
anthropogenic erosion of biodiversity and of the ecosystem services
essential to civilization. This “biological annihilation” underlines the
seriousness for humanity of Earth’s ongoing sixth mass extinction event.  *

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