Monterey Cypress.

A client asked me to look at her mature Monterey Cypress, Cupressus macrocarpa, as it is starting to go brown in patches although the rest of the tree looks in good shape. I'm not an expert on trees and I wonder if it's got a disease or parasite. Any experts out there able to help?

Chris

 

Hi Chris

Browning of evergreen foliage can be caused by a number of things; one of the biggest being Cypress aphid. These sites may be of use to you in identifying the problem:

Conifers: brown patches / Royal Horticultural Society

http://apps.rhs.org.uk/advicesearch/profile.aspx?PID=492

Cheers,
Matthew