Potatoes

Have a look at this: Scab but you'll also find lots about it on this site if you search. 

Enjoy your spuds!

Try growing on a different bit of land next year and maybe you might dig in some grass mowings in late autumn too. I often simply dump the mowings on the surface at the end of summer as it discourages the weeds. The worms take much of the grass into the soil and I help out when I fork / dig over at the end of the season.

Good luck for next year 

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PS Excuse if this is reminding grandma about sucking the eggs