Potato Scab

Asked January 20, 2017, 5:48 PM EST

My vegetable garden has a pH pf 7.3. To control potato scab it has been recommended that I lower the pH to 5.2 or less. How do I do that? Cheers! David Allan

Morrison County Minnesota

1 Response

Here are three approaches.

One is to lower the soil pH by adding elemental sulfur. This is an ongoing and long term project:
http://www.extension.umn.edu/garden/yard-garden/soils/soil-test-interpretations-and-fertilizer-manag...

Second is to use raised beds, where you can control soil pH quite specifically:
http://www.extension.umn.edu/garden/yard-garden/landscaping/raised-bed-gardens/

Third (and my recommendation) is to ignore the recommendation and plant the potatoes anyway. Potatoes will grow in higher soil pH (and 7.3 is not that high). You might get some scab, but you might not. You can hedge your bets by planting scab-resistant varieties such as described here:
http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/faq6699?opendocument