Elm Leaf Beetle Treatment Southern Highlands

Guy O’Donnell B.Sc. ElmConsultants.Com.Au

Do you live in the SOUTHERN HIGHLANDS?

You may not have heard about the Elm Leaf Beetle.

It’s here. 

                           Two mature elm leaf beetles 5-6mm long, biting holes in an Elm leaf resulting in a “shot-hole” appearance

URGENT NOTICE FOR THE 2019/2020 GROWTH SEASON

 

 

THE MASSIVE NUMBERS OF BEETLES NOW PRESENT IN YOUR DISTRICT WILL RESULT IN  RAPID DEFOLIATION THIS SPRING 2019
BOOK YOUR TREATMENT INJECTIONS NOW TO PROTECT YOUR TREES FOR THE SPRING BUD BURST.
IT IS IMPERATIVE TO WATER YOUR TREES FOR AS MANY DAYS AS POSSIBLE BEFORE INJECTIONS IF POSSIBLE AND WEEKLY AFTER INJECTIONS FOR THE BEST POSSIBLE RATE OF CHEMICAL UPTAKE.

In July 2017, starting in Mittagong, I found it had spread to  Bowral, High Range, Burradoo, Moss Vale, Sutton Forest, Exeter, Bundanoon and Berrima and had attacked every Elm I stopped to look at. Fitzroy Falls, Kangaloon and Robertson were the same. Judging by the level of foliage damage, it is in its second or third season in the Highlands. This means there is a significant build up of the beetle population sufficient enough to defoliate a 50 year old Golden Elm, by February, having started in October in one growth season. The only reason the Grand English Elms we love and Golden Elms weren’t seriously attacked by Christmas was the late zero degree frost in October.

But hoping there’s a frost is hardly a reason not to protect your elm against the inevitable.  We can provide an effective level of protection of your tree for up to 3 growth seasons or part thereof. Last spring(2017),  the Highland Elms, were lucky, but the beetle numbers have been  increasing since then, as they do, because ELB cannot be eradicated, and you will see shot holes in the leaves then the larvae causing leaf skeletonising till late March -April. In fact, the beetles will hibernate and emerge in October typically; and the cycle continues.

Repeated defoliation results in terminal bud dieback and loss of the Canopy curvature with resultant tertiary (branchlet) dieback. If prolonged, sporadic dieback of primary and secondary laterals will occur, because photosynthesis will be repeatedly interrupted and photosynthate-storage will be reduced ; ultimately  major laterals i.e. the scaffold branches of the tree will go into decline and die. contact elmconsultants.com.au if you would like to find out more. We service the Southern Highlands, and across to the Central Tablelands.

Sooner or later, most of the Elms in the Highlands will be decimated. Every leaf turns brown, curls and drops.

I discovered and notified Biosecurity in Adelaide after finding the mother tree in Malvern in December 2011. In 3 years it had spread to every suburb across the Metropolitan Area. 2 years later, very few pockets of trees were not attacked and it had spread in a radius upto 2 hours from Adelaide along the major traffic arteries hitching a lift on vehicles and people.  It is now endemic throughout SA wherever Elms grow.

Proof of Treatment 

St Peters Boys school Adelaide

Classic weeping elm

PROOF OF TREATMENT SUMMER 2015 ON 3 GOLDEN ELM CULTIVARS

1ST  Cultiver 20 years old, injected mid summer of 2015

Same tree, first cultiver, one year later, summer 2016

Below, a second cultivar, front view one year after treatment, in the summer 2015

Below, same second cultivar, reverse view, 2 years later in the summer of 2017

Below, second cultivar, 35 years old (different tree) one year after treatment. “I couldn’t resist

putting this photo in,

it’s a beautiful specimen

3rd Cultivar 50 years old. Late Summer 2016

When are the Beetles most active and what damage do they make??

Photos show the process for the first generation. There will be a 2nd and possible third depending upon geographical location and its climate. The monthly timings vary according to climatic influence.

POST- HIBERNATION, EMERGENCE IN SPRING.

DEATH FOR BREAKFAST

Treatment 

Stem injection ONLY

What we do

Methods

Sterility

Why we wont spray

Ladybirds and Assassin bugs help the natural predators colonise your garden.

  

WHAT YOU CAN DO

(A) Interrupt the life cycle

1. 3 DAY DUCT tape

DUCT tape is the safest method. CHANGE IT EVERY 3 DAYS.

Sticky pads can melt , running down trunk and blocking the lenticels of

the bark preventing the bark from breathing

2.Clear all litter from around each tree for 500mm and keep as bare

earth.

3.So when pupae settle there you sweep them up and drop them into

a bucket of water

(B) Irrigation particularly in hot dry climates like Adelaide

1. Water heavily before and after for a couple of weeks each time

your tree is irrigated then once per week through summer in hot

dry climates.

Damage from injectors methods to avoid

I don’t leave plastic plugs in your trees. I only drill a 3.5 mm hole using a sterile drill bit, a sterile injector, and a sterile filler nozzle. The images below show what should NOT be done.

Incredible service from Guy, very happy

01/04/2018

Sharon

We were so lucky to have Guy notice our Elm trees were in danger of not surviving. we hope all the work he has put into the injections work well.

01/09/2018

Valerie de Burca

Guy is an absolute genius when it comes to pest control. Seriously talk to the man for just a few minutes and you’ll see that he knows what he’s doing and he cares. Extremely ethical and knowledgeable. Do yourself a favour and just have a chat.

01/20/2019

Jeannie Wright

Second year after treatment, some damage by beetles in last month to small section of one branch, only apparent from close range. Infestation probably from nearby tree which is badly damaged. No signs of eggs or caterpillars.

01/20/2019

Bob Tinker

The damage, from Elm Leaf Beatle , to our 2 elms has been increasing each year and was getting to a state where we believed It would really impact the trees. After consultation and treatment by Guy during winter , this Springs new growth has shown very minor damage on the lower foliage on one tree and virtually no evidence of attack on the other. These are 30 plus year old trees and to us well worth saving , so will keep in touch with Guy for further advice and treatment if necessary.

01/20/2019

Paul Fioic