Cheshire,
United Kingdom 
I have just noticed what looks like white small caterpillers on my japanese acer tree and wondered why they are on it and how do I get rid of them. We have recently planted it in the ground after in being in a large tub.
4 Jul, 2010
Answers
could be scale insect, looks like sticky white substance
5 Jul, 2010
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Never seen caterpillars on an Acer but this does not mean that they don't have them. Spray with soapy water or hand pick them off - if you've got chickens they will love you!
4 Jul, 2010