horse chestnut tree

Question

Hi – my horse chestnut tree of around 50 years old is suffering from the leaf miner moth grubs and has done for a number of years. It rallied afew years ago but had a bad year last year with no conkers. This year the leaf buds are already falling from the tree. I need to feed it and help it in some way. What can you suggest I can buy and feed the root system with? I read this: ‘Percival and Berkshire arboricultural consultant Simon Holmes have assessed the efficacy of three “systemic inducing agents” – Messenger (active substance harpin protein), Phoenix (potassium phosphite) and Rigel (salicylic acid derivative) – and a conventional insecticide, deltamethrin, against the pest, with all providing some control.’ and would like to know if I can buy these to feed the tree with.. if so how do I measure out the right amount and can I put the solution into the earth on top of the soil around the tree? I can buy halo harpin and Rigel G online but would appreciate some advice.. many thanks. I’m in the UK. Martine Parry

Answer 1

I am sorry. I just realized that you were in the uk. Consult this website to find information on the nearest service that can help: https://www.gov.uk/government/organisations/department-for-environment-food-rural-affairs

Answer 2

Unfortunately, if this has been an ongoing problem for this long, then there is no way to get to the nest deep within the tree. Aging trees that become infested with such problems will usually die out as it is destroyed from the inside. I would consult with your local extension service for further options. This link will help you find the nearest one to you: https://www.gardeningknowhow.com/extension-search/