Q.Potatoes
I did not harvest my potatoes, and I do believe they had blight. Now what do I do for the new season?
Certified GKH Gardening Expert
There are two diseases of potatoes that are commonly called blight: late blight and early blight. The following articles will help you identify them and will give you information on treatment.
https://www.rhs.org.uk/advice/profile?PID=217
http://vegetablemdonline.ppath.cornell.edu/factsheets/Potato_LateBlt.htm
http://ipm.uconn.edu/documents/raw2/Early%20Blight%20and%20Late%20Blight%20of%20Potato/Early%20Blight%20and%20Late%20Blight%20of%20Potato.php?aid=52
http://vegetablemdonline.ppath.cornell.edu/factsheets/Potato_EarlyBlt.htm
If you determine that your potatoes had one of these diseases, the best option for next year is to rotate crops- plant something that's not in the nightshade (Solanaceae) plant family and that therefore won't be susceptible to the same diseases:
https://www.gardeningknowhow.com/edible/vegetables/vgen/nightshade-vegetable.htm