  Plant had died and decayed by 26 July 2010. (The partially excavated carcass is shown below).  Control #166 had also died of a disease when we visited in March 2016. We suspect this may be a rot following damage by an insect such as the blue cactus borer but we have not yet positively identified the organism that is responsible. Here are some more images of #166 in 2016:
Control #148 was showing indications of a fungal disease on 10 March 2014.    Control #164 is infested with some sort of a scale insect. 10 March 2014.   And also on #180 in March 2016.  All of the above were in Jim Hogg County, Texas.
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Cactus
Conservation
Institute
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