This is one of the problems with growing honeysuckle against a wall, there
is a lot of stagnant air so you can get a build up of humidity, just right
for mildew. Some varieties are more prone, and I find the worst to be the
little yellow leafed Lonicera Japonica aureo reticulata.
If you think of it, Honeysuckle is a hedge row plant where it has air moving
through it

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk