Re: [cumberland-plain-psyllids:29] Digest for cumberland-plain-psyllids@googlegroups.com - 2 Messages in 2 Topics

[Don Burke]

Given that Imidacloprid has been strongly implicated in Bee Colony Collapse Disorder - it would be very irresponsible to spray it as previously suggested. Mark is sort of correct - the psyllids do attack at this time of year BUT this last 12-18 months has featured a very severe level of damage. I have observed these trees over the last 30 years and this is by far the worst attack.  This is very likely to be due to compromised immune systems due to the recent 10 year drought.

Don Burke FAIH, Tree surgeon & Arborist

On 03/04/2013, at 5:51 PM, cumberland-p...@googlegroups.com wrote:

  Today's Topic Summary

Group: http://groups.google.com/group/cumberland-plain-psyllids/topics

• Reply to Mark [1 Update]
• [cumberland-plain-psyllids:27] Digest for cumberland-p...@googlegroups.com - 1 Message in 1 Topic [1 Update]

 Reply to Mark

"wayne olling" <wayne....@optusnet.com.au> Apr 03 12:28AM +1100  

Mark,
 
Thank you very much for your advice.
 
I certainly hope it is as you suggest - signs of normal, not plague activity of Psyllid activity.
 
The White Oil seemed to work on the juvenile last year but then it might just have been a seasonal influence as you suggest.
 
Best Wishes,
Wayne

 

 [cumberland-plain-psyllids:27] Digest for cumberland-p...@googlegroups.com - 1 Message in 1 Topic

<ma...@arboristnetwork.com.au> Apr 02 08:41PM +1100  

Wayne
 

 
White oil will be largely ineffective since the lerp/test will prevent
coverage of the spiracles. Imidacloprid is a much better option and has a
very high LD50 so can be readily used as a spray on small trees. It is
systemic and can be applied in numerous other ways.
 

 
The Australian College of Arboriculture holds an off label permit to apply
Imidacloprid as a soil injectant (and to train and licence others to do the
same)a process that took four and a half years to obtain.
 

 
However, I would not be concerned about normal levels of psyllid activity.
A population of Grey Box Psyllid is common at this time of the year and
normally peaks over the winter months then subsides. Unfortunately, Red Gum
Psyllid (Glycaspis brimblecombei) peaks at the same time so predation and
parasitoid activity can be a little stretched.
 

 
The dieback of flushing foliage appears to be more related to depleted
carbohydrate reserves. Maintaining optimal soil moisture levels will be of
benefit in minimising the demands on these reserves. Carbohydrate
supplements (molasses) has also been shown to be absorbed by roots so this
may be of use with important trees.
 

 
Mark
 

 
From: cumberland-p...@googlegroups.com
[mailto:cumberland-p...@googlegroups.com]
Sent: Tuesday, 2 April 2013 5:51 PM
To: Digest Recipients
Subject: [cumberland-plain-psyllids:27] Digest for
cumberland-p...@googlegroups.com - 1 Message in 1 Topic
 

 
Today's Topic Summary
 
Group: <http://groups.google.com/group/cumberland-plain-psyllids/topics>
http://groups.google.com/group/cumberland-plain-psyllids/topics
 
§ Psyllid Report [1 Update]
 

<http://groups.google.com/group/cumberland-plain-psyllids/t/60f09ad6b39cbe6a
> Psyllid Report
 
"wayne olling" <wayne....@optusnet.com.au> Apr 01 04:47PM +1100
 
Greg,

Further to my report last week:

The juvenile (just over 2m tall) E. moluccana at the corner of Leabons Lane
& Seven Hills Rd South, Seven Hills, has more intensive Lace Lerp activity
now than last week despite my having sprayed infected leaves last week with
White Oil. Activity has spread on the tree.

Another mature E. moluccana on a private property in Seven Hills South which
had been stripped of all leaves in the last round of Lace Lerp activity has
recovered in recent weeks to have about a third of the tree with leaf cover.
However, in just this past week I have observed the uniform death of the
regrowth leaves as you would see with leaves of a branch broken off from a
tree. Either the tree has given up or it has been poisoned. I don't think it
is Lace Lerp activity due to the sudden and uniform leaf death. It is on a
private property so I can't get to within 30 metres of the tree to check
further.

Best Wishes,
Wayne
 

 
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