Halogenated hydrocarbons covers a lot more than just DDT.

All the persistent ones are banned for crops in any reasonable country.
Some may still be used for termite control, but few people eat wood.

But the problem with POP's was that the invertebrates getting some dosage
from the wood etc. were eaten by animals higher up the food chain.

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Regards from Robert Seago : http://www.users.zetnet.co.uk/rjseago