replaced due scale of the from insect Dr While the leaf miner caterpillar does not kill the tree, it weakens it and makes it vulnerable to other diseases, in particular bleeding canker
, which can be fatal.
Cardiff council said the trees in question were suffering from bacterial bleeding canker
and will be replaced with 10ft trees once the works are completed.
More than half our horse Jackson chestnuts have potentially deadly bleeding canker
which causes sticky trunk lesions.
While the leaf miner does not kill trees, there is a serious bleeding canker
disease that does.
Ken Simons, Warwickshire County Council's forestry officer, said: "The wet start to the year has had a severe impact and this is coupled with many of our common horse chestnuts suffering attacks from a range of pests and diseases, namely bacterial bleeding canker
, leaf miner and leaf blotch.
Horse chestnuts are being hit by leaf miner and bleeding canker
," said Simon.
In recent years a number of devastating problems have hit our chestnuts including a Bleeding Canker
that gradually kills the tree, a scale insect that spreads rapidly and a leaf miner that has come to us from Southern Europe over the last 8 years.
Hilary Makins, head warden of the estate, said: "The crowns and bark are dying and there is the tell-tale black sticky exudation oozing from the trunks, which sadly indicates the presence of bleeding canker
Half the species' estimated one million trees could already be infected with a condition known as bleeding canker
They also say the trees being removed are suffering from bacterial bleeding canker
and will be replaced.
Simon, who is currently running a course this term called the Secret Life of Trees, adds: "We also need to make people aware of the threat to horse chestnut trees from a disease called bleeding canker
and a serious new pest, a leaf miner.
Up to 41% of the nation's estimated 11,100 horse chestnuts have so-called bleeding canker
disease, according to the Forestry Commission's investigation arm, Forest Research.