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7-Jun-2007
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#1 |
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Mame & Shohin enthusiast.
Join Date: Mar-2005
Location: East Yorkshire
Country: England
Posts: 128
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Aphids, galls and yellow speckled leaves - how to cure my Oak?
Hello, I have an English Oak bonsai and sadly, it has fallen victim to an aphid infestation. The leaves are contorted and speckled with little yellow dots and there was 'galls' on the branches but I have removed them all.
What can I do to prevent the new growth from becoming infected? How can I solve this problem? Thanks. 
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Aphids, galls and yellow speckled leaves - how to cure my Oak? |
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7-Jun-2007
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#2 |
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rookie
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i'm not sure what's available in England, but a good sysemic insecticide should do a pretty good job of controlling aphids, look for the active ingredient "imidicloprid"
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8-Jun-2007
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#3 |
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bonsaiTALK Master
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Hi Phil, (Mariner?)
Eng Oak (Quercus Robur) seems to be very prone to this in UK bonsai cultivation. They're just a great big "all you can eat for free" hang out for myriad insects. They get mildewy - mould a lot as well. A product like Provado Total Bug Killer should do the trick. Perhaps a tad of fungicide would help as well. Oak are pretty tough and will usually throw out a second flush of growth in summer called Lammas Leaf (reddish) after everything's done eating them. Unless the tree is extremely weak it should be OK. There's big old oaks around Reading and Southampton that are virtually leafless due to insect attack just now while others a quarter mile away in the same field are heavy with leaf. For the last 2 years I have been pre-treating all my trees with insecticide and fungicide round about mid March and have had no major insect probs at all despite a garden full of the wife's flowers. Not very "green" I know but seems to have stopped scale and aphid attacks in recent years. The galls are probably caused by one of many gall wasps that inhabit oak. See http://www.treesforlife.org.uk/forest/species/oak.html Hope this helps. TimR
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