"Mike Lyle" wrote in message
...
Rodger Whitlock wrote:
On Sat, 20 Nov 2004 18:27:16 +0000, Rod
wrote:
[...]
It's systemic so it takes a while to work, the pests have to suck
the
sap containing the pesticide, [...]
If it's systemic, then why does it work when applied externally to
cats to rid them of fleas? One of its great advantages in flea
control
is that it kills the fleas before they even have a chance to bite
the
animal -- a blessing for an animal allergic to flea bites.

Interesting. Perhaps the vet concentration is higher than the horti?
Or there's some additive which alters the effect?

Mike.


As I understand it the effect is the same in both cases, once the insect has
ingested the stuff by feeding, the chemical stops it feeding and it starves
to death, it is this change in method which makes it safer to use on mammals
than conventional insecticides.

--
Charlie, gardening in Cornwall.
http://www.roselandhouse.co.uk
Holders of National Plant Collection of Clematis viticella (cvs)