Elm leaf beetle

The elm tree population in Williamstown has significant environmental, historical and amenity value, protected by planning and heritage policies. Council has over 900 elm trees ranging from newly planted to mature.

Treatment of Elm Leaf Beetle (ELB) occurs annually and is broken down into a three-year cycle. The majority of the work occurs in Williamstown and is broken down into streets/blocks. Additional works may be required if an outbreak occurs in a previously treated area. If left untreated, the elm leaf beetle severely defoliates the elm causing it to shut down and potentially die.

The Elm Leaf Beetle treatments include all park trees in the Williamstown area and all streets external to Williamstown. All trees will be soil injected and should last for three years.

What does an elm leaf beetle look like?

The elm leaf beetle is small, around 4mm long, dark brown/green with two lighter green stripes running down its back.

What do elm leaf beetle eggs look like?

The eggs of the beetles are laid on the underside of the leaf in late November and look like two rows of bright yellow dollops from a VERY small piping bag.

They hatch after about eight days and the first incarnation of larvae crawl about initiating leaf damage.

Skeletisation of Elm leaves

Photo 1. Skeletisation of elm leaves

elm leaf beetle and eggs

Photo 2. Elm leaf beetle and yellow elm leaf beetle eggs