Beginner Gardening: Potato... Time to harvest or???, 0 by dsid

dsid wrote:
This is my first attempt at growing potato's. I started the first weekend in May with the seeds of yukon & red potato and put them at the bottom of a whiskey barrel with about 5" of soil. Every few weeks I covered them with additional peet & soil as they grew taller and eventually reached the top of the barrel. I have had a couple of rounds with flea beetles, and have treated them twice with a recommended remedy from the local nursery. We have also had extremely warm temps and low humidity here this year with 42 days over 90 and counting.

As the leaves seem to be getting yellow & brown and the stems are loosing their green color, I am curious if it is time to harvest or if I have made some kind of a blunder.

Any advice is appreciated.