Potato leaf brown spots

Janet_ZhouMay 26, 2011

Hi,

We are growing some purple potatoes in our garden, and the plants are having serious brown spots on them. We did some research on the web, and the closest we came to was early blight. But the brown spots do not have concentric circles to them. here are pics: http://janetzhou.smugmug.com/Nature/Potato/i-bc4swH9/0/L/Potato-Leaf-L.jpg

Could it still be early blight, or is it some mineral deficiency, or other disease?

Thanks!

Janet

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taz6122(N.W. AR.6b)

Looks more like Septoria or bacterial speck to me. Look at it through a magnifying glass. A gray spot and several black spots in the middle of the spots would suggest Septoria.

Here is a link that might be useful: Septoria leaf spot

    Bookmark   May 26, 2011 at 5:15AM
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naturegirl_2007 5B SW Michigan(5B SW Michigan)

taz6122: That's a great site I hadn't seen before. It's explanations help me see differences that have confused me in the past. Thanks!

    Bookmark   May 26, 2011 at 7:51AM
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