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Apple trees - Damage to bark with white grubs underneath

Hi,

Is anyone please able to help identify the pest shown in the attached photos? All affected trees are of the same variety (sweet coppin) and there are three other varieties in the orchard, none of which appear to be affected. 

Affected bark is definitely dead, it pulls off easily exposing the damp wood underneath with the grubs clearly visible and their almost sawn in trails, there are also multiple holes bored into the trunks. 

My guess is all affected trees need grubbing out and burning, however I'd love someone to be able to advise what exactly is going on with them.

Many thanks in advance for any help




Posts

  • FireFire Posts: 19,096
    bump
  • I suspected the same as @pansyface. Certainly the results of some kind of bark beetle grub.  The grubs eat the cambium layer (the thin living part of trunks and branches which is between the wood and the outer bark.)  Some general info here:

    A trowel in the hand is worth a thousand lost under a bush.
  • Hi both, thank-you very much for the comments.

    Thinking back the affected trees haven't been the healthiest specimens for a while (lots of lychen, irregular fruiting in particular), it might just be this particular variety isn't very well suited to the site and the beetles have taken advantage of them in their weakened state. 

    I'll be grubbing them out next weekend then...

    Thanks again. 
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