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Thursday, 31 August 2006
Yellow Leaves

Yellow leaves of Horse Chestnut

I took this photo in Richmond this afternoon, next to the Thames River.  It shows a Horse Chestnut tree infected with the Horse chestnut leaf miner or Cameraria ohridella:

Larvae of C. ohridella mine within the leaves of horse chestnut, and the damage caused by large numbers of larvae can be striking. Up to 700 leaf mines have been recorded on a single leaf under favourable conditions. Severely damaged leaves shrivel and turn brown by late summer and fall early, well before normal leaf fall in the autumn.

The spread and establishment of Cameraria ohridella is of particular concern because once established, the moth appears always to maintain exceptionally high rates of infestation without any evidence of decline. In European towns and cities there has been no decrease in populations even after many years, and severe damage to horse chestnuts has occurred on an annual basis, greatly impairing the visual appearance of the trees.

There is no evidence from Europe that trees have died or shown a progressive decline in health as a direct consequence of attack by Cameraria ohridella. However, it is possible that differences in climate or interactions with other pests and diseases might lead to greater impact on horse chestnut in Great Britain.

The second last sentence (“Don’t Panic”) is probably the most significant.

Posted by bigblue on 31/08/2006 at 10:06 PM
Filed under: EuropeUnited KingdomEngland • (0) CommentsPermalinkBookmark or Share

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