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Produce => Edible Plants => Topic started by: ceres on May 21, 2009, 22:40:04

Title: Diseased Potatoes
Post by: ceres on May 21, 2009, 22:40:04
I've dug up a couple of my Rocket plants which have been fine.  Got to the next one in the row today and all the tubers are diseased.  I thought initially they looked blighted but I think it's way too early and the haulms are healthy.

The problem seems to start with brown discolouration around the stalk area of the tuber which looks like it causes it to split open and rot as the tuber swells.  The potatoes are all mis-shapen, small, flattened, sort of pumpkin shape.

Any ideas?

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Title: Re: Diseased Potatoes
Post by: Tattieman on May 21, 2009, 23:19:50
I would say it is potato spraing which can be present in the soil. It just seems to effect some areas and then everything else is fine.
Title: Re: Diseased Potatoes
Post by: ceres on May 21, 2009, 23:55:16
Thanks Tattieman.  I've been googling and I'm not sure about the spraing.  The affected tubers don't have the brown markings inside.  Found the Potato Council's website (great for id on pests, diseases and conditions btw) and these are the best I can match to:

http://www.potato.org.uk/department/knowledge_transfer/pests_and_diseases/ref.html?item=49 (http://www.potato.org.uk/department/knowledge_transfer/pests_and_diseases/ref.html?item=49)

and this one:

http://www.potato.org.uk/department/knowledge_transfer/pests_and_diseases/ref.html?item=34 (http://www.potato.org.uk/department/knowledge_transfer/pests_and_diseases/ref.html?item=34)

Might send the picture to Alan Roman and see what they say.

Title: Re: Diseased Potatoes
Post by: PurpleHeather on May 22, 2009, 00:56:09
They look like they have been in a bad drought.
Title: Re: Diseased Potatoes
Post by: davyw1 on May 22, 2009, 07:32:22
what about watery wound rot
Title: Re: Diseased Potatoes
Post by: Tattieman on May 22, 2009, 08:04:49
Yeah send it to Alan and tell him this is the crop you got off his seed ;D
You should get a quick reply ;)
Title: Re: Diseased Potatoes
Post by: Tee Gee on May 22, 2009, 14:29:28
Looks like 'Blackleg' to me

see here; http://www.potato.org.uk/department/knowledge_transfer/pests_and_diseases/ref.html?item=11 (http://www.potato.org.uk/department/knowledge_transfer/pests_and_diseases/ref.html?item=11)
Title: Re: Diseased Potatoes
Post by: Tattieman on May 22, 2009, 18:29:50
I think we should all agree that it is a case of spraing with vascular browning and a touch of blackleg with watery wound rot thrown in for good measure ;D
It is a strange thing as Rocket have good resistance to spraing and blackleg. They can crack and split if they are left to mature.
It shouldn't be blackleg if the haulm was healthy.
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