Elm Leaf Beetle
The Significance of Elm Trees to Victoria
Victoria has an estimated 70,000 Elm trees spread throughout parks, public and private gardens and as street trees, with the oldest being up to 150 years old. These trees represent a significant world population following the devastation of many millions of Elm trees caused by Dutch Elm Disease in Europe, America and Asia. In southern England alone the loss was estimated at 17 million trees. Currently, Dutch Elm Disease has not been found in Australia although it is in New Zealand.
Beetles can fly up to several kilometres as well as being carried by vehicles. Beetles may enter vehicles parked under Elm trees and then be carried to other sites.
Feeding by Elm Leaf Beetle is restricted to Elm trees of European origin and occasionally the Japanese Zelcova. In Victoria infestations occur on English Elms, Dutch Elms, Golden Elms, Weeping or Scotch Elms, Variegated Elms and Horizontal Elms. Chinese Elms are generally not affected.
Elm Leaf Beetle FAQs
What area does Arborco service for ELB treatment?
All Melbourne suburbs, Regional Victoria.
When do you treat for ELB?
- Stem injection is anytime of the year, preferably june to October as it is prior to emergence of the beetle. Better to treat prior to the leaves emerging in spring.
- Soil injection July – October if soil moisture is adequate.
- Canopy spray – Only when the beetle is active in foliage, November to February
How long does the treatment last?
Stem and soil injections last 2 -3 years.
Why would you inject the tree or soil rather than canopy spray?
Canopy spray lasts 6 – 8 weeks whereas soil or stem injection is effective for 2 – 3 years.
How is ELB treatment priced?
Price is determined by the trunk diameter at 1 metre height in cms.
How do I measure diameter?
Circumference at 1m high divided by 3.142
Multi stem trees are measured at ground level.
Will there be any beetle damage after treatment?
Beetles need to ingest the chemical that kills them, therefore some damage will be evident.