AusBonsai

I'm assuming that those that have English Elms are taking precautions against that nasty little beast known collectively as Elm Leaf Beetle..Pyrrhalta luteola

Here in Boronia Victoria these pests have already snuck in literally overnight.
Watered yesterday and this morning 'scatter gun holes everywhere.
On my large stump that has been growing like a banshee with it's natural tiny leaves has suffered with the beetles chewing tiny holes right at the leaf base.
The other three got the 'trade mark peppering of holes.
This is all overnight with no sign of larva. Plenty of beetles though.
Concentrated Pyrethrum did the initial barrier that has stayed the return although I'm sure they are rampant in the canopy of my neighbors Mature English elm next door.
I have CONFIDOR arriving soon so that will stitch them up as this is the recommended treatment for this murderous little bug.

So in writing I'm just reminding again 'mid October is upon us and this is the trigger for Pyrrhalta luteola to attack.


Regards Steve.
.

A little better Shot of just what damage these little Beetles can do.

They are around decimating large elms here that havent been treated . They just started getting into my large twin trunk EE but a heavy dose of Malathon stopped them in there tracks DIE!

Also note that English elm is not the only species these guys eat. They also like my zelkova and when they get really hungry they also have a few bites from Chinese elm leaves as well.

shibui wrote:Also note that English elm is not the only species these guys eat. They also like my zelkova and when they get really hungry they also have a few bites from Chinese elm leaves as well.

I can vouch for Zelkova . They really get into my golden zelkova garden tree

I don't know if anyone would do this to their bonsai, but as an arborist I regularly inject elms with silva shield at this time of year. I guess it could work. Might save your bigger ornamental trees in the garden too.

Coolsy