Blood and Bone for roses

neptune wrote:

Balinbear wrote:I was talking to someone at our garden day about it and he said that the Adelaide Uni (I think that is who he said) did some tests using all the chemicals, milk etc and they found that most effective control of powdery mildew was to hose the plants with water a couple of times a day to wash the spores off.

This is in line with an old rose grower who recommended in a book (not sure which one) that overhead watering in the afternoon was the best method of control which is completely opposite to the normal recommendations so far as watering goes.
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This is what I have been saying  for years on here....so glad the Uni agrees with me....