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Yellowing leaves at base of potato plants


 
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loopy
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PostPosted: Mon Jun 22, 2009 10:15 am    Post subject: Yellowing leaves at base of potato plants Reply with quote

As a rule, my plants look generally healthy( pic1). However at the base of the plants (I have them growing in potato bags) I'm finding more and more leaves are yellowing and stalks rotten so I need to break them off. (see second pic). I'm not sure whats causing this..they are pretty confined in the bag, could this be it? I think I have the slugs sorted with beer traps and Im not seeing any in the bag for the last while. Could it be lack of light (hence yellow)? Thanks for any suggestions!


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Plants look generally ok.
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loopy
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PostPosted: Mon Jun 22, 2009 10:42 am    Post subject: Reply with quote

Just had a look at the Is this Blight? post and it looks like it may be Verticullium (not sure of blight). Is is ok just to keep removing damaged leaves/stalks which I hope will ensure the rest of the plant survives!
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michael brenock
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PostPosted: Mon Jun 22, 2009 12:20 pm    Post subject: Reply with quote

probably black leg , a bacterial disease can be transmitted in the seed more a problem in wet Springs, have seen many cases of it this yearbut am surprised that it occrred in grow bags
michael brenock horticultural advisor (retired)
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loopy
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PostPosted: Mon Jun 22, 2009 12:37 pm    Post subject: Reply with quote

Thanks Michael..Im relieved its not blight! Can I just keep stripping out the yellow leaves and stalks or am I better to leave well alone?
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michael brenock
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PostPosted: Mon Jun 22, 2009 4:00 pm    Post subject: Reply with quote

if the affected stalk comes up easy on pulling then it is Blackleg otherwise it could be any one of several root diseases including verticilium or Rhizoctonia. better off to pull up the entire affected stalk at one go.
michael brenock horticultural advisor (retired)
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