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Apr 13, 2017 at 12:42 history edited CommunityBot
replaced http://gardening.stackexchange.com/ with https://gardening.stackexchange.com/
Aug 23, 2013 at 19:31 history edited kevinskio CC BY-SA 3.0
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Aug 23, 2013 at 17:43 comment added RockScience dspace.unict.it/bitstream/10761/1219/1/… for a good reference
Aug 23, 2013 at 16:43 vote accept RockScience
Aug 23, 2013 at 16:43 comment added RockScience thank you very much for your help. After some research based on your hint, it seems to be 'Parlatoria ziziphi', which is indeed a variety of black scale. The leaves are not really sticky but comparing my plant with pictures of this scale is clear.
Aug 23, 2013 at 10:55 history answered kevinskio CC BY-SA 3.0