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Thuja infested with moths

We have several thuja trees which are infested with moths in a cocoon. Could you please tell me the best method to eliminate these pests?

 

This is the conifer bag moth. It doesn't do too much damage and can be controlled by spraying with an insecticide such as Maldison or Orthene.

Conifers also get attacked by mites which can be controlled with Mavrik which kills other insects as well but is safe to use when bees are around.

UnitecAdvice by Dr Dan Blanchon from Unitec's Diploma in Sustainable Horticulture and Bachelor of Resource Management.

Reproduced with permission from NZOOM Home and Garden content,
from the previous website of  TVNZ News

The views expressed here are not necessarily those of the RNZIH
 
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