have all the flies gone?
John A Burton
are all conscious of the decline in species of birds, such as spotted
flycatchers, marsh tits and skylarks, but there has been very little
comment on the disappearance of flying insects. Of course it is
difficult to be objective so I start from a purely subject point
of view. Twenty or more years ago I recall often having to clean
my windscreen because there were so many squashed insects on it
when driving around at dusk. I also recall cycling to the local
pub on a summer's evening and on arrival having my beard literally
pale green with aphids trapped in it. And when I first moved to
Suffolk full time in 1978, I recall buying the nasty old sticky
flypapers to hang in my study, and they soon became the ghoulish
graveyard of countless flies. I grew up in an era, when most houses
still had net curtains, which were not as is so often assumed today
to conceal the goings on inside, but to keep the flies from flying
through a window open for ventilation.
As I write,
I have before me a book entitled: Fighting The Fly Peril: a popular
and practical handbook, published in 1915, at a time when horses
were still a major form of transport, and consequently manure still
a major source of breeding grounds for flies, even in towns. Now
even in the wider countryside, flies are a rarity, and along with
them it appears that numerous other insects are disappearing.
If this entirely
subjective, anecdotal evidence is remotely true it is very worrying
since so much wildlife is dependent on insects. It would certainly
help explain the dramatic drops in numbers of birds. But where is
the data on insect numbers? Years ago I often dabbled in entomology,
but do not recall ever keeping records of sweep net catches - we
just picked out the interesting specimens and shook the rest free.
The same at light traps for moths. Presumably someone, somewhere
has some quantitative data. If so I would very much like to know
about it. I have tried finding references on the internet, but failed.
A lead or two would be very useful.