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Blight or not


 
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pplsgod
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PostPosted: Fri Aug 12, 2011 12:43 pm    Post subject: Blight or not Reply with quote

Hello all...

Was up in allotment the last few days and have been keeping an eye on my potatoes.

One in particular looks a little wilty but not sure if this is blight or the natural dying off process of the foliage.

Would appreciate any comments / thoughts

James



2011-08-11 19.40.28 (1).jpg
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Potato leaves
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2011-08-11 19.40.28 (1).jpg


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pplsgod
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PostPosted: Fri Aug 12, 2011 12:50 pm    Post subject: Reply with quote

Neglected to mention that the allotment is located in a very open location and was battered all week so wind burn was my thinking
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Gautama
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PostPosted: Fri Aug 12, 2011 12:53 pm    Post subject: Reply with quote

I doubt it's blight.
Are the dark bits dry or damp?
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pplsgod
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PostPosted: Fri Aug 12, 2011 12:54 pm    Post subject: Reply with quote

Hi Gautama

Spots are dry, almost crunchy when touched. Dont think water can be lacking after all the rain we have had this week
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gardenman
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PostPosted: Fri Aug 12, 2011 1:10 pm    Post subject: Reply with quote

Slight chlorosis of leaves while leaf veins are staying green along with scorched leaf margins. Could it be Potassium deficiency?

http://nbsystems.co.za/potato/index_14.htm

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pplsgod
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PostPosted: Fri Aug 12, 2011 1:23 pm    Post subject: Reply with quote

Hi Gardenman

That looks about right doesn't it...

What is unusual is that this week is the first I have noticed the problem, we pulled one stalk last Saturday and had maybe 8 good size potatoes but the skins were not yet ready so going to leave the rest for another couple of weeks.

Is there anything that can be done now to help the problem or is it a bit late in the growing season? Liquid tomato feed perhaps?
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michael brenock
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PostPosted: Fri Aug 12, 2011 11:05 pm    Post subject: Reply with quote

looks like black leg disease (bacterial) or it may be slug damage or mechanical damage due to wind, not a nutritional lack as it is too isolated. Dig it out and use the produce and allow the remainder to grow on.
michael brenock horticultural advisor (retired)
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