August 27, 2008

Early Fall or what is going on here?

I have noticed this year that the chestnut trees looked to be infected with some kind of worm or some other leaf maladie... I didn't look it up until now, because I kept forgetting... 

But, the other day when Barbara and I were walking together.. We started to discuss it when we noticed trees whose leaves were already brown and that had a pile of dead leaves at the base of the trunk. When we got to the Parc de Sceaux, we really noticed that all of the marroniers leaves were really brown and a lot of leaves were already on the ground, at the end of August!!! Just a bit early for fall... 

So, I did some research tonight and found out this info... 


Leaf Miner

Horse Chestnut Leaf Miner is an insect pest, Cameria ohridella, which attacks the leaves of the horse chestnut. This arrived in the UK in 2002 from Europe. The larvae mine within the leaves and can cause striking widespread damage. Severely damaged leaves shrivel and turn brown and fall by late summer, well before the normal autumn season. There is no evidence so far that this causes the tree itself to die, as only the leaves are affected: the tree's reduced photosynthetic ability may affect its growth during the growing season.

Experts recommend the leaves should be disposed of during the winter months to limit the spread.

Leaf Blotch

Guinardia, or Leaf Blotch, is one of the most common diseases, caused by the fungus Guignardia aesculi. This disease can be mistaken for the leaf miner disease. It is recognisable by the reddish or dull brown irregular blotches that are often concentrated at the tips and margins of the infected leaves. The blotches are often outlined by a conspicuous yellow band. Again this disease only affects the leaves of the trees, reducing their photosynthetic ability and leaves need to be disposed of during the winter to limit its spread.

1 comment:

Le Tigre in France said...

The tree outside of the apartment has actually turned all red already, the amount of rain and cold weather we've had in Moselle has tricked it into an early autumn!