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Old 10-01-2010, 03:46 PM
 
3,004 posts, read 3,874,097 times
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This was the first year that we tried to grow potatoes. They are white potatoes, not sure if they are russets. Anyway, they did not get very big at all, though we got a lot of them. As I'm washing and cutting them, I'm finding that about 2/3 of them have brown or black rot spots in the dead center of the potato. What causes this?

We used a neighbor's horse manure as fertilizer but it had sat for a year before we used it so I thought it should be properly composted and okay to use.

We live in northern Oregon where there is a lot of rainfall but planted in late spring/early summer so they didn't really get waterlogged. They had good sun exposure.

Not sure what went wrong. Why so small, and why the rot spots?
Anyone?
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Old 10-02-2010, 12:11 PM
 
7,138 posts, read 14,599,556 times
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Quote:
Originally Posted by chattypatty View Post
This was the first year that we tried to grow potatoes. They are white potatoes, not sure if they are russets. Anyway, they did not get very big at all, though we got a lot of them. As I'm washing and cutting them, I'm finding that about 2/3 of them have brown or black rot spots in the dead center of the potato. What causes this?

We used a neighbor's horse manure as fertilizer but it had sat for a year before we used it so I thought it should be properly composted and okay to use.

We live in northern Oregon where there is a lot of rainfall but planted in late spring/early summer so they didn't really get waterlogged. They had good sun exposure.

Not sure what went wrong. Why so small, and why the rot spots?
Anyone?

Maybe from this fungus?


Phytophthora infestans - Wikipedia, the free encyclopedia
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Old 10-02-2010, 01:22 PM
 
Location: PNW
682 posts, read 2,412,524 times
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It's most likely "hollow heart," a common condition with potatoes. They are still fine to eat, just cut away the affected area.

HS945/HS197: Potato Physiological Disorders - Brown Center and Hollow Heart
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Old 10-02-2010, 10:49 PM
 
3,004 posts, read 3,874,097 times
Reputation: 2028
Quote:
Originally Posted by figmalt View Post
It's most likely "hollow heart," a common condition with potatoes. They are still fine to eat, just cut away the affected area.

HS945/HS197: Potato Physiological Disorders - Brown Center and Hollow Heart
That's interesting because we had an unusually unseasonably warm May, during which we planted everything, and then a cold spell came along in June and lasted about three weeks and it was VERY cold, even got to freezing a couple of nights. All our plants suffered and most of them failed altogether. I'll bet this is what happened to our potatoes.

Thanks.
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