What could be so notable about a humble moth to make it worthy of a memorial? What you see here is a prickly pear. It is a fairly common sight through southern inland Queensland.
However, not so long ago it was choking all before it as an introduced pest. Without any of the pests of its native home, it found the conditions of inland Australia much to its liking and spread, much like the rabbit, until it overran and choked the entire countryside. The land became unsuitable for agriculture or grazing and the future was looking grim.
As had been tried in many other situations, being unable to control the introduced pest by any man-made methods, man turned to a natural predator for assistance. Famously, this method fails many times – think of the cane toad. The introduced control could become yet another introduced pest when it finds other new prey to its liking. However, on this occasion, the humble cactoblastis moth went to work and did what other methods could not. Pastures that had been choked by the all-consuming weed were reduced to cactus wastelands as the moth larvae worked away at the structure of the plant and left them in rotting piles.The control worked.
So today
the prickly pear remains a fairly common sight on the southern and western Darling Downs in Queensland, but it is no longer the choking all-consuming menace it once was. Now all that remains in this story is for us to stop treating the fruit as an uncommon niche delicacy and work out a way to market it so that poachers will want to clean up the rest.
So when you are next travelling the Warrego Highway west from Toowoomba through the Western Darling Downs, keep you eye out not for the plaque, not for the statue, but for the memorial hall built to honour the humble cactoblastis moth that could do what man could not. http://monumentaustralia.org.au/monument_display.php?id=90605&image=1
