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Apple tree disease - any ideas?


 
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eris
Rank attained: Hazel Tree
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PostPosted: Wed Jul 08, 2009 7:29 pm    Post subject: Apple tree disease - any ideas? Reply with quote

Can anyone identify this disease that's afflicting my apple tree and if you can, is there a treatment? It doesn't resemble anything I've seen of the common apple tree diseases. All the leaves are like the one in the second picture, covered with irregular brown splodges. Some leaves also have markings that indicate they've been tunnelled by larvae - you can see them in the picture too. The larvae are very small - about half a centimetre long. But it seems to me that the larval problem is separate from the problem causing the brown splodges.

There are also white tufts - see the first pic - on the branches that secrete sticky stuff. The few fruit have fallen off at this stage. The tree has had the disease for several years but this year it looks quite terrible. I sprayed it with Bordeaux mixture at bud break this year and last, but that has had no effect.



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Liparis
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PostPosted: Wed Jul 08, 2009 8:10 pm    Post subject: Reply with quote

Looks to me like the leaves are suffering drought or drying winds. The white substane looks very like wooly aphid they tend to congregate on those lumps and bumps on apple trees where the tree is repairing wounds etc. It has saps quite close to the surface. Check by squishing them, if the squish looks like squished beasties then it's wooly aphid or a similar crerature. Normal spraying won't get through to them so you would need a systemic, the woolyness is a protection. A systemic won't work fast enough to prevent them spreading to other plants so while it's working get yourself some Isopropyl alcohol from a chemist, I always keep a bottle for dealing with the likes of these and scale insect etc. The alcohol breaks down the protection and gets into and kills the insect. You could also use a two pronged attack, spray with the alcohol, then hit them with permythrum once the coating is broken down. I mix the alcohol 50/50 with water for these jobs.
If your tree is badly infested all over with these nasties, then alcohol will be expensive, plus a bad infestation can be having that effect on the leaves.
Bill.

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michael brenock
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PostPosted: Wed Jul 08, 2009 9:20 pm    Post subject: Reply with quote

I think Liparis is right it is wooly aphis and his treatment is correct. The browning of the leaves might be a different problem and the dropping of the fruit could very well be June drop even though it is July. There is a leaf miner attacking the leaf but this is not serious. it is very hard to get rid of Wooly aphis,
michael brenock horticultural advisor (retired)
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eris
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PostPosted: Thu Jul 09, 2009 8:44 am    Post subject: Reply with quote

Thanks for the advice - I'll try what you suggest. Squishing the white fluff produced wet brown stuff with soft granular bits, so I guess those were aphids. I guess the tree could be suffering drought - it's between a wall and a concrete area and shed, so it may not get all the water it needs.
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DennisJennings
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PostPosted: Wed May 11, 2011 5:51 pm    Post subject: Same Problem Reply with quote

Hi
I have exactly the same leaf problem as shown in the first post. I do not have the fluffy aphids problem.
Can anyone provide further help?
Many thanks
Dennis



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Margo
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PostPosted: Wed May 11, 2011 6:06 pm    Post subject: Reply with quote

I had something like this on my quince tree. I took the leaves to Wisley. They told me it was a canker/rust and advised spraying with Bordeaux mixture, or cut it right back. I couldn't spray as the tree was over 20 ft high so I cut it right back. It flowered quite well after that but I never got any fruit.
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michael brenock
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PostPosted: Wed May 11, 2011 10:19 pm    Post subject: Reply with quote

rather surprised that you were told at Wisley that canker was the problem as canker does not affect leaves, shoots and branches only. The leaf is being attacked by a leaf miner, seldom a serious pest and as the pest is concealed within the leaf between the upper and lower skin it is impossible to get at it even if you wanted to spray. Ignore the problem as the tree will survive the attack.
michael brenock horticultural advisor (retired)
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DennisJennings
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PostPosted: Wed May 11, 2011 10:35 pm    Post subject: Reply with quote

Michael,
Thank you.
Dennis
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