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I managed to get some slips started from a store bought (treated) sweet potato in May this year. Took a very long time to get going but eventually got 3 slips started. One of the three has two leaves affected by what looks like a powder, but it is not loose powder. I tried to rub some off of the leaf at left but nothing detached, I only managed to crush the surface of the leaf. The underside of the leaf looks completely normal. Sweet potato leaves with powdery appearance

Colin Beckingham
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1 Answers1

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I am not sure, but it could be colleters. There is a story here about colleters on sweet potatoes, the photos look a little bit different though. They think it is because of overheating.

It can also be a fungal infection, but usually you can scrape that off the leaves.

benn
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