BEEN ORGANIC FOR OVER 20 YEARS, POTATO VINES OR DYING
BEFORE CROP IS READY FOR HARVEST, ALSO, WHITE PIMPLES ARE ON
MOST OF THE SMALL POTATOES. SANDY SOIL --WEST TEXAS-
WATERED WITH DEEP WELL WATER

Taken from:
http://www.dirtdoctor.com/dallasnews.php?id=175:


Q. I have a 30’ by 30’ plot where I plant my potatoes. Every year the plants and potatoes do well but there are little holes in the potatoes as if they’ve been pierced with an ice pick. Could this be fire ants and what can I do about it? It wipes me out every year. Whatever is doing this is eating the inside of the potatoes. – B.B., Cisco, TX
A. If you haven't already, try dry molasses or a fertilizer that contains it and beneficial nematodes. The addition and stimulation of biological activity should neutralize this pest whether it is wireworm (my best guess), fire ants or some other soil-borne beast.