How does fly spray work? The unanimous explanation on the web is that it contains chemicals that block the effect of an enzyme that causes a muscle to release after it has been ordered by a neurotransmitter to contract. That sentence is too long but, believe me, it is a very short version of the explanation. The result in the fly, or other insect, is uncontrolled muscle spasms, which explains the wild flight of a dying fly, and it is this loss of muscle control that kills the fly if repeated collisions don't. So fly spray poison is a neurotoxin, and, yes, in much bigger quantity it would have the same effect of vertebrates (you and me) as it does on invertebrates (the fly). Some people believe this neurotoxin is sometimes responsible for headaches and other ailments in people.
In my column in The Herald today I tell how, as a child in the 1950s and '60s, we sprayed the house as a matter of course with tin-can fly sprays that coated all surfaces with a poison. I don't know what the toxin was but it was certainly effective. Still, I survived. Who knows whether those who succumbed to leukaemia and other cancers owe their illness to the toxins that pretty well drenched our homes and food. It is known, though, that many of the poisons in household products today do cause cancer. Beyond question. Yet many are still sold freely in Australia for domestic and farm use.
Choice magazine has just found that many of the poisons used in our insect sprays, head lice treatments, flea shampoos and other products that "protect" us from insects have been banned or are in the process of being banned in Europe and the US. It points out that one poison used in insect spray in Australia, chlorpyrifos, is a neurotoxin banned in the US for almost a decade because of its suspected links to childhood leukaemia and diseases or disorders of the reproductive and immune systems.
The problem is, according to Choice, that Australia has a permissive wait-and-see attitude to poisons, as opposed to Europe's requirement that the manufacturer prove the toxin is safe before it is sold.
Can there be any good reason, any excuse, for our authorities' indifference? What can we do about it?