Winter Moth Treatments

Boston Tree Preservation controls the Winter Moth either by spraying or systemic injection.


When spraying, Conserve is used.  The active ingredient in Conserve is Spinosad, which is derived from the fermentation of a naturally occurring organism, uniquely combining the efficacy of synthetic insecticides with the benefits of biological insect pest control products.  It has no mammalian toxicity.  To view the MSDS (material safety data sheet) click here.

Applications are made when trees first leaf out and the winter moth is a free-feeding caterpillar.


In situations where spraying is not practical due to the size of the tree or its proximity to waterways, Boston Tree Preservation injects the tree with ACE-jet using the Arborjet closed injection system.  The product is injected directly into the sap flow of the tree with no exposure to the applicator, the soil or the air.  Injection treatments are usually made once every three years.  For more information, click here.