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Blisters on peach fan in greenhouse

My peach fan inside the greenhouse is covered in little dark blisters which can be scraped off and leave a powdery deposit. The leaves are dying and falling off from the top. It was recently covered in ants but they have gone now. Help please!?Help

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  • pansyfacepansyface PEAK DISTRICT DerbyshirePosts: 20,550
    edited May 2020
    They look like scale insects. They suck the sap, weakening the tree, and exude a honey type of liquid which the ants drink.

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  • I had some of those on my peach tree. As pansyface says they are scale insects. I rubbed them all of with my finger nails. Look 
    especially under the branch, this is where they get the most sap from. After you have got rid of them all, feed your tree and mollycoddle it. Keeping a eye out for more as the very small ones may have been missed, they will grow and multiply if left on. One thing in your favour is that they move very slowly. Valerie 
  • Many thanks Valerie, I'll take your advice.
  • Is it worth picking off the dusty bumps do you think? And/or cut off infected
    branches?
  • I’ve had scale really badly affect my lime tree recently. If you’ve got the time to remove the bugs from really badly infested areas you could try that but I found any leaves ended up dropping anyway. 
    I’ve done two ‘deep cleans’ of my tree removing over 100 scale. Using rubbing alcohol and a cloth/ cotton pad apparently the best way to ensure you kill them. 
    I’ve had most success after using the ‘Provanto ultimate fruit and veg bug killer concentrate’. Not a fan of chemical pesticides but manually removing them wasn’t stopping them reappearing. 
    I still find the odd few that need removed now but they’re almost gone. Definitely needs a bit of perseverance to keep on top of. 
    I probably wouldn’t Prince the branches as they should recover. The leaves may not.
    Good luck. 
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