Horse chestnut leaf miner and bleeding canker

[arb culture]

Really interesting, and very definitely worthy of a first - well done!

 

Just out of curiosity, what management would you now suggest for an early stage infection of syringae on a horse chestnut in a public and well used space?

[rupert]

There are no proven ways of treating the bacterium. However, ensuring the tree is healthy and vigorous will reduce susceptibility to the infection and facilitate recovery. As more than 80% of urban tree disorders are caused by problems below ground it's paramount to create a healthy environment for the tree's roots to thrive. The most common problems include nutrient deficiencies, drought and soil compaction.

 

So anything to remedy these problems (decompaction/aeration of the rhizosphere, nutrient and mycorrhizae spore injection, aplication of organic mulch and restricting public access to the RPA) will improve the tree's chance of survival.

 

Leaf miner infestation will also reduce the tree's photosynthetic performance, depleting starch reserves and reducing the tree's productivity and vigour. Thus also needs to be controlled.

 

It's also worth looking into Allicin/Conquer if the budget allows.