RE: [cumberland-plain-psyllids:27] Digest for cumberland-plain-psyllids@googlegroups.com - 1 Message in 1 Topic
ma...@arboristnetwork.com.au
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
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Subject: [cumberland-plain-psyllids:27] Digest for cumberland-p...@googlegroups.com - 1 Message in 1 Topic
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§ Psyllid Report [1 Update]
"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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