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Apple Tree Dying?

Im not sure what is wrong with my Gala Dwarf Apple tree, it is in a big tub (as the instructions said when i got them from thom/morg). I think it might be dying .
I have another apple tree and pear tree in the same size tubs and they are doing fine.
Can anyone help please.
All advice welcome
Nottinghamshire.
Failure is always an option.
Failure is always an option.
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What sort of compost is it in?
How often is it watered and how much?
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Its in Gro Sure All Purpose Compost. I carefully take the top layers off in late winter, early spring and replace it with Marshalls Organic Extra and new gro -sure mixed together to freshen it up.
I water it when it needs it, evey 4 days or so. If its very warm more often, if its wet less.
Is this wrong?
Failure is always an option.
Watering regime sounds ok, provided you give it enough water each time to wet the rootball. When plants start the season growing well, as your tree has, and then collapse, I'd suspect something's going on with the roots, so they can't support the top growth.
I would rather give a tree a bucketful of water once a week than a little evey few days.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I have just had a look in the compost and found these
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Failure is always an option.
Vine weevil grubs?
Not sure about the longer one
Failure is always an option.
Yep, unfortunately.
(Well, the C shaped ones.)
The other long grub I don't recognize.
Thanks for you help everyone, im on the look out for vine weevil killer now
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Failure is always an option.
Bayer sell a product to kill vine weevil, you juST need to water it on. They say it lasts for 3 months. I've just used it on a small decorative cherry tree in a pot but think i have lost it. As a precaution I have treated all my other plants growing in pots that are susceptible to vine weevil and would suggest you do this too.
Nematodes which attack vine weevil are very effective, and safe to use on edible crops (not that anything edible will come from your apple tree in the near future...) Nemasys is the name of the one I used on my strawberries. Expensive but good.