"Annabel" wrote in message
...
Please bear with me here,

If nicotine kills red spider mite
and nicotine is systemic
and plants can take up nicotine via the roots

then could you put a cigarette into the compost of a potted plant to
kill the little buggers

if so what would be the "rate" of cigarettes to litres of compost

It sounds clever, but my guess is that you will end up with the most
expensive compost in the world.

How about taking it one step further and just growing plenty of Nicotiana
specially for composting?

Franz