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"fern scale" (black)

Hi Folks,
I know you know what I'm talking about.  It often infests the 
undersides of the fronds.  I thought I ID'd it as Idiopteris 
nephrelepidis, but I'm not 100% positive.
It also looks a lot like Aphis gossypii in its black form.
Can anyone help?  I can use soap and oil, and I'm using some 
parasitic wasps, but I'd sure like to know what it is.  I guess I'd 
better send it off to be ID'd.


Shelley Dillard
Morris Arboretum of the University of Pennsylvania
100 Northwestern Ave.
Philadelphia, Pennsylvania 19118
phone:  215-247-5777 x118
email:  rdillard@pobox.upenn.edu
web site:  http://www.morrisarboretum.org

There are two ways to live your life.  One is as though nothing is a 
miracle.  The other is as though everything is a miracle.
Albert Einstein  

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