In the last decade, the image, which is already common in all southern countries (Latvia, Lithuania, Poland), and is now even the so-called "normal" - is, the previously nice green leaf chestnuts (Aesculus hippocastanum) has been replaced with trees with brownish leaves and it is sometimes massive.
What? Who?
In this case, it may be a moth, known as a horse-chestnut leaf miner (Cameraria ohridella).
The moth is in itself a nice-looking and meaningful being - http://insecta.pro/gallery/70366, its larvae are making the brown spots that can distract us.
In the case of soft winters, the pupae spend their time cheerfully in the fallen leaves and are back in action in the springtime.
There is also a fungal disease in Estonia that causes quite same thing, it is called Guignardia aesculii, but it can be easily distinguished from horse-chestnut leaf miner actions - look at the damaged leaf against light, and if you see that the spots are much brighter than the edges, it is a leaf miner work.
Why is it like that?
This is probably because the climatic conditions of our location have changed for years now - long dry autumns and soft winters - all this has affected the general health of plants and the possibilities of fungi and insect pests living in different warmer regions to move to new hunting grounds.
Is it dangerous to plants?
At the moment, in general, not particularly - it is a problem for the plant to prevent the photosynthesis process and thus to inhibit the natural processes of the plant, but for humans, the problem is limited to a reduction in the ornamentation of the plants, which, for example, in certain gardens like botanical gardens, arboretums and nurseries can be quite uncomfortable.
What to do?
In principle, we can do our best for our plants - to take care of the availability of nutrients in the soil and access the necessary moisture, and - collecting and burning or composting the fallen leaves is a very important factor - this is probably the most useful method of protection.
Source: Urbandendro
http://ravelreiljan.blogspot.com/
 |
| Horse-chestnut leaf miner Damage (Cameraria ohridella). Photo: Ravel Reiljan |
What? Who?
In this case, it may be a moth, known as a horse-chestnut leaf miner (Cameraria ohridella).
The moth is in itself a nice-looking and meaningful being - http://insecta.pro/gallery/70366, its larvae are making the brown spots that can distract us.
In the case of soft winters, the pupae spend their time cheerfully in the fallen leaves and are back in action in the springtime.
There is also a fungal disease in Estonia that causes quite same thing, it is called Guignardia aesculii, but it can be easily distinguished from horse-chestnut leaf miner actions - look at the damaged leaf against light, and if you see that the spots are much brighter than the edges, it is a leaf miner work.
 |
| Horse-chestnut leaf miner Damage (Cameraria ohridella). Photo: Ravel Reiljan |
Why is it like that?
This is probably because the climatic conditions of our location have changed for years now - long dry autumns and soft winters - all this has affected the general health of plants and the possibilities of fungi and insect pests living in different warmer regions to move to new hunting grounds.
Is it dangerous to plants?
At the moment, in general, not particularly - it is a problem for the plant to prevent the photosynthesis process and thus to inhibit the natural processes of the plant, but for humans, the problem is limited to a reduction in the ornamentation of the plants, which, for example, in certain gardens like botanical gardens, arboretums and nurseries can be quite uncomfortable.
What to do?
In principle, we can do our best for our plants - to take care of the availability of nutrients in the soil and access the necessary moisture, and - collecting and burning or composting the fallen leaves is a very important factor - this is probably the most useful method of protection.
Source: Urbandendro
http://ravelreiljan.blogspot.com/
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