|
Symptoms
| |
Spots on the leaves initially pale brown, later intense brown, roundish to oval, later confluent and elongated, often bordered by the leaf veins. Fruiting bodies of the asexual stage mainly on the upper leaf surface: small black conidiomata (pycnidial type) with distinctly darker ostiole, spores (conidia) of two types: macroconidia oval swith a short hyaline appendage, microconidia allantoid, hyaline. Possibilities of error: mainly horse chestnut mining moth (Cameraria ohridella, but this with leaf mines filled with feces. Other leaf inhabiting fungal species are much rarer.
|
|
Impact
| |
This disease can cuase premature defoliation and intense browning of chestnut-leaves, especially following rainy periods in spring. Intensity can easily reach the one typical for horse chestnut mining moth. Damage generally low, since repeated infestations are rare.
|
|
Control
| |
In urban areas removal of leaves in autumn is usually sufficient to reduce the infection-potential for the followoing year. Application of fungicides is possible, it should be done at the time of budburst (see federal register of plant protection); however, in most cases it is not necessary.
|
| Hosts |
|
Horse chestnut;
|
| Affected plant parts
| |
Leaf;
|
|
|
|
Guignardia aesculi: leaf spots
|
Guignardia aesculi: leaf spots with fruiting bodies of
|
Guignardia aesculi: leaf spots, early stage
|
|
|
Guignardia aesculi: fruiting bodies of , pycnidia with dark stained ostiole
|
Guignardia aesculi: fruiting bodies of , pycnidium and spores (conidia)
|
|
|
The shown graphical material is copyrighted. © 2006 BFW Wien. You can use the images for your own publications only if you name the source AND if you have a valid agreement with BFW Vienna. Furthermore images in high resolution are for sale at BFW.
In this case please contact (Department of Forest Protection) or , our PR manager.
|
