Tree Diseases


Municipal Office

395 Mulock Drive P.O. Box 328 Station Main, Newmarket, Ontario
L3Y 4X7

Email Us

As with any ecological feature, Trees in Newmarket are vulnerable to pests, disease, and injury. Well-known invasive species and diseases such as the Emerald Ash Borer have done significant damage to certain species. Other fungal infections such as Tar Spot and Cankers can weaken trees or make them appear to be in danger without necessarily causing the death of the tree.

These threats include the Emerald Ash Borer, Cankerworm, and other invasive species and diseases.

The Emerald Ash Borer is in NewmarketPhoto of of the Emerald Ash Borer Bug

The Emerald Ash Borer (EAB) is in Newmarket. The EAB is an invasive species that attacks and kills Ash trees. EAB poses no health risk to humans or pets but Ash trees of all species and sizes (with the exception of Mountain Ash tree) are susceptible to attack from the EAB. 

Read more about the EAB here.


Fall cankerworm has been identified in the following locations in Newmarket: fall-cankerworm.jpg

  • Bogart Creek near Srigley Street
  • D'arcy Street and Church Street

Read more about cankerworm here.

Lymantria dispar dispar (European Gypsy Moth) Gypsy Moth Caterpillar.jpg

Lymantria dispar dispar (LDD) also known as the Gypsy Moth, is an invasive insect that has been found in the Town of Newmarket. LLD caterpillars will eat the leaves of a variety of trees but oak species are generally targeted. Most healthy trees can withstand one to several years of defoliation by LDD as healthy trees are able to regrow their leaves during the same growing season within two to three weeks.

Read more about LDD moth here.