"Martin Brown" wrote ...

Scale insects and wooly aphids won't even notice water spray unless you use
a destructive pressure that strips bark and removes all the leaves.


Actually I use water with a bit of washing up liquid to clean my Citrus
trees of scale, something they seem very prone to. I use a sprayer pumped up
as hard as possible and starting at the top go over every branch and leaf
blasting them off. It works well but you also get soaked.
--
Regards. Bob Hobden.
Posted to this Newsgroup from the W of London, UK