LDD Moth

Lymantria dispar dispar or “LDD moth” (formerly known as gypsy moth) is a forest defoliating insect found in Ontario. Outbreaks occur every 7 to 10 years.

The province of Ontario posts information here and makes available a protocol document (PDF, 5 pages) with steps to conduct an egg mass survey to estimate the population of the moths on your own property.

News & Related Events:

August 31, 2021 – Hastings County asking for help to track LDD infestations (Hastings County)

July 2021 – see additional resources posted by the Environment Council for Clear, Ston(e)y and White Lakes

June 23, 2021 – as reported by the Ontario Woodlot on Twitter: “A member reports that the virus and fungus are taking hold. The photo shows the classic fungus (left) and virus (right) effects.” [see image at the side]

June 2021 – We are pleased to provide access to a recording of an informative June 10, 2021 gypsy moth webinar hosted by the Eastern Ontario Model Forest (EOMF)  and Ontario Woodlot Association (OWA) websites .  On their webpages you will find a link and passcode to the webinar.

May 22, 2021 – Gypsy moth caterpillars ‘virtually everywhere’ in SW Ontario, expert says (CBC.ca)

May 3, 2021 – Town of Oakville to conduct aerial spraying to combat gypsy moths (Toronto Star)

April 2021 – Gypsy Moth Information from the Regional Forest Health Network (Southern Ontario)


July 30, 2020 – FOCA webinar: Understanding the Gypsy Moth – FOCA Members are welcome to click to view the digital recording of the webinar (1 hour, 15 minutes) or download the slides (PDF, 7 MB)

Information about Gypsy Moths:

July 22, 2020 – How Ontario is battling a very hungry caterpillar (TVO) – Gypsy-moth caterpillars are killing trees throughout the province.

July 15, 2020 – Eastern Ontario in grip of worst Gypsy moth outbreak in 30 years (Belleville Intelligencer)

July 9, 2020 – Forests in Peterborough and the Kawarthas are under attack (Peterborough Examiner)

Michelle LewinLDD Moth