X Cupressocyparis leylandii aphid

[treemenders]

Hi All.

 

Interesting title grabbed you eh....

 

Got a query really and wanted to see if anyone else had come across it.

 

I've come across a few of these aphid infestations, but mainly on leylandii or lawsons.

 

I've been called out a couple of times recently to look at Western Red Cedars with, what would appear to be, a similar problem.

 

It's not a localised dieback, but all over (inner canopy, tips etc).

 

I took out a completely dead Lawsons the other day with a Thuja beside it. This was perfectly healthy and completely green. 3 days later, brown patches were appearing?

 

Anyone come across this, has it affected Westerns (yee ha!) any treatments?

 

Cheers all. Hope the weather's not messing with you!

 

Andrew

[treefrog]

cypress aphid (cinare cupressi)

Affects all you said not to sure about westerns don t see why it wouldn 't some one else may be able to answer that.

[chilli]

Not seen it at all on thuja but plenty of brown patches on leylandii round my way (mid Anglia). A couple of my customers have bought a chemical from the garden centre to spray on the hedge but my theory is that by the time you see the brown patches, any treatment is too late.

As an aside, I have recognised that leylandii's trimmed more than just once a year are more prone to browning/die back.

[treemenders]

Yeh - the general view is once the brown's appeared, it's too late. I've tired tapping the brown with a stiff brush which then drops and new growth has a chance for some light, but only in minor infestations. I believe the double cutting promotes growth and therefore, more sap in new shoots - which then appeals to the aphid. A harsh winter frost'll get em!! Growing gills and wet rot this week! All the best to all. A