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Unwanted tree!
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For more on marking an answer as the "Best Answer", please visit our FAQ.The sticky stuff that comes out of the tree in summer is known as "honeydew", which is the result of aphids feeding on the leaves, often a black mould will grow on it afterwoods,
As a compromise i would suggest the tree is pruned/lopped in the summer when its in full leaf, i've seen street trees managed in this way..
Recent research (see link at end); quite technical but interesting reading
Crown-reduction reduced soil drying by trees in the year of pruning, but the effects were
generally small and disappeared within the following season, unless the reduction was severe, in
which case the effects were larger and persisted for up to two years.For practical soil moisture conservation, severe crown-reduction 70-90% of crown volume
would have to be applied. Reduction of up to 50% crown volume is not consistently effective
for decreasing soil drying. In practical terms I have reservations about the use of crown reduction for controlling water uptake. The degree of reduction required is probably detrimental to the long term health of the tree but, in cases of tree related building subsidence, it may be the only way forward short of removing the tree. I think the implication is that correct species choice and planting distances are required in the first instance. The problem today however is that we are dealing with trees that are already mature and few options are open to us.
http://www.bre.co.uk/filelibrary/Water_Use_report_May_2004_final_submitted_exec_summ.pdf