Posted: 05/08/2016 at 23:27
Spray with a mixture of 1 part milk to about 19 parts water at 5 day intervals - you should see an improvement in a couple of weeks. Also, you say that your climbers get "lots of rainwater". Are you actually watering them? If they are on a wall, they will get far less rain than you think because of the rain shadow effect.
Also, remember that there are many different mildews; the mildew on one plant will not necessarily affect another. So the mildew on your climbers, for example, is not the same as on your fruit trees. You do not have one attack of mildew, but many different ones, possibly caused by a common factor.
Last edited: 05 August 2016 23:27:57