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Powdery mildew

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- White powder coats leaves, shoot tips and flowers in summer. Sometimes confused with downy mildew. Powdery mildew also often is accompanied by stunted and distorted growth, and reduced flowering. Sometimes a pale beige felt appears on the undersides leaves with a yellow area above, or affected foliage can appear black or discoloured.

Rose mildewOn roses, white powdery deposits appear on flower buds and on leaves in spring. The disease overwinters on fallen leaves or as infections on young stems and in buds. In spring the spores re-infect young leaves. This disease can also spread by wind and can re-infect even at low humidity.

Like rose rust, this fungus can only grow on living host tissue.

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Question from anita

I have over a dozen rose bushes highly infected by this. It is mid August, what do I do?

  • Views: 829
  • Replies: 2
  • Posted: Tue. 12th August 2014 14:46
  • Last reply: Wed. 13th August 2014 07:07


Question from shirley Pearce

We have just moved to a newly built house, have put a border to grow flowers. We planted Lonicera Halls Prolific which started off very well. Then we noticed bits of whit on the leafs and leafs falling off. Is it wise to cut it back and start again.

  • Views: 943
  • Replies: 2
  • Posted: Sat. 10th September 2011 11:48
  • Last reply: Sat. 1st October 2011 17:20

Apple Tree leaf mould

Question from Kate Rich

Hi...Some of the leaves on my apple tree are curling up and they are covered in a pale grey powdery white/grey substance that can be wiped off - it also seem to have affected the amount of apples I have this year - although I dont remember there being an awful lot of blossom on it this spring - unlike my peach tree...Any suggestions...Thanks

  • Views: 1186
  • Replies: 0
  • Posted: Sun. 1st May 2011 06:11

Powdry Mildew on amalanchier

General post from Graeme Robinson

Hi, I have a small hedge of amalanchier. They have plenty of space around them and they have been watered regularly. All the planst have been infected with powdery mildew. What is the best course of action to take?


  • Views: 1215
  • Replies: 2
  • Posted: Fri. 20th August 2010 17:55
  • Last reply: Sun. 19th September 2010 13:28