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Aphids on silver birch


 
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mongolianyurt
Rank attained: Hazel Tree
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PostPosted: Tue Mar 05, 2013 8:06 pm    Post subject: Aphids on silver birch Reply with quote

Hi could anyone help me with the following...just after seeing loads and loads of aphids on my silver birches that I planted last March. How can I get rid of them organically? Could they kill the trees or spread to other trees as they are part of a native hedge. The leaves did have brown spots on them and turn yellow before Autumn last year....I thought it might have been part of leaf fall process....

They also have lots of white spots all over the branches and main stem, we live about 2km from the sea...could it be sea salt or are my silver birches doomed!!
Thanks in advance for any help.
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Greengage
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PostPosted: Tue Mar 05, 2013 10:20 pm    Post subject: Reply with quote

Aphids are sucking insects and can transmit viruses, your spots could be scale insects any chance of pic. to remove aphids you could use washing up liquid mixed with water or Power wash them off with garden hose. Dont think your problem is terminal but you will have problems if you have roses or veg garden. suprised you have them now with weather so cold.
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mongolianyurt
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PostPosted: Thu Mar 07, 2013 9:55 pm    Post subject: Reply with quote

Thanks Greengage. I'll try and sort out a photo and post it. I can scrape off the white spots with my finger nail and it is powdery like salt...never encountered scale insects before...could this be a sign of their presence? Thank you.
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Greengage
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PostPosted: Fri Mar 08, 2013 7:31 pm    Post subject: Reply with quote

Scale insect picture
http://ugatcext.blogspot.ie/2010/10/scale-insects.html
APhids on rhs wewbsite scrol down
http://www.rhs.org.uk/Gardening/Grow-Your-Own/Advice
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mongolianyurt
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PostPosted: Sun Mar 10, 2013 9:39 pm    Post subject: Reply with quote

Hi, here's photo of aphids attached.

I did more googleing and think it might have birch dieback as well, yellow leaves last Summer, end of branches weak and dead looking, so perhaps the aphids came along because its so weak. Might not have had enough water in dry period week or so back also.

Cant figure out white spots seen in photo either. Again as I mentioned they scrape off with my nail and turn to gritty salt like substance.



Birch aphids1.jpg
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Birch aphids1.jpg


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Greengage
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PostPosted: Sun Mar 10, 2013 10:14 pm    Post subject: Reply with quote

the little white spots are probably Lenticles on the branch, this is natural google lenticles on birch for more info
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mongolianyurt
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PostPosted: Wed Aug 07, 2013 3:41 pm    Post subject: Canker on birch Reply with quote

Hello all, could someone let me know how to treat canker on my silver birches please? They are the same trees mentioned above. I don't think they are at all healthy!

It seems to be causing the dieback as well. Should I take out these trees altogether or can they be saved by pruning and or fungicide? If so is there a fungicide recommended?

Thank you.
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