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Thread: Potato mosaic virus

  1. #9
    Snoop Puss's Avatar
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    Quote Originally Posted by nickdub View Post
    top and roots in the Council green waste - dig a 2' hole and bury the compost would be my method.
    This is why I asked. According to various websites, soil is a vector for this virus, which is why I'd be worried about burying the compost. I found this:
    "PMTV is spread by spores of the powdery scab pathogen Spongospora subterranea. Powdery scab favours moist soil and cooler temperatures ranging from 11 to 15 C. PMTV is widespread in parts of both North and South America, and can remain alive for up to 18 years in soil within fungal spores or in host plants."

    I have to say, I was assuming it was something like magnesium deficiency. Where did you get the potatoes from?

    Bikermike, there are lots of websites that have photos of symptoms of mineral deficiencies and diseases in potatoes. This one looks to be quite good on nutrient deficiencies as you can see a set of photos alongside each other and compare:
    https://www.yara.co.uk/crop-nutritio...cies-potatoes/
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    bikermike is offline Cropper
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    Thanks Snoopers!

    I may have potassium deficiency.
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    Just replied to a post on another forum about a possible virus infection. As far as I know if the green and yellowing on the leaves have some sort of definite pattern then it's a soil deficiency. I've just giggled images for this and it is possible that's what you have. See what others think.
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  4. #12
    nickdub is offline Early Fruiter
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    Quote Originally Posted by Snoop Puss View Post
    This is why I asked. According to various websites, soil is a vector for this virus, which is why I'd be worried about burying the compost. I found this:
    "PMTV is spread by spores of the powdery scab pathogen Spongospora subterranea. Powdery scab favours moist soil and cooler temperatures ranging from 11 to 15 C. PMTV is widespread in parts of both North and South America, and can remain alive for up to 18 years in soil within fungal spores or in host plants."

    I have to say, I was assuming it was something like magnesium deficiency. Where did you get the potatoes from?

    Bikermike, there are lots of websites that have photos of symptoms of mineral deficiencies and diseases in potatoes. This one looks to be quite good on nutrient deficiencies as you can see a set of photos alongside each other and compare:
    https://www.yara.co.uk/crop-nutritio...cies-potatoes/
    Its true that a lot of diseases are soil born, but personally I wouldn't worry about burying suspect compost, as long as I wasn't planting anything from the same family in that area - ie if burying potato compost I'd happily plant courgettes on top of it, but not tomatoes.
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    I noticed a similar thing on one of my potato plants today. It's Desirée, certified seed grown in fresh multipurpose compost, so a virus would be very unlucky. It's about time to start feeding with tomato fertilizer so I'll see whether it goes away.

    Potato mosaic virus-potatoleaves.jpg
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    nickdub is offline Early Fruiter
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    Quote Originally Posted by Martin H View Post
    I noticed a similar thing on one of my potato plants today. It's Desirée, certified seed grown in fresh multipurpose compost, so a virus would be very unlucky. It's about time to start feeding with tomato fertilizer so I'll see whether it goes away.

    Attachment 86755
    The marks on the leaves on your plants look a lot more like a deficiency pattern to me - pretty typical for it to be regular and near the end of the leaves.

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    They're seed potatoes and the compost is fresh. I cut off the affected leaves and thought about leaving the bucket in an isolated location to see if more leaves would yellow (to see whether it was fertiliser burn or viral infection). But I think it might be safer to dispose of it. It's only a little bucket and I have more in potato grow sacks, so not worth the risk. Thanks all for your advice!
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    ^If it's only a little bucket, then nutrient deficiency is a strong possibility. The feed in compost, even fresh, doesn't last for long. Move the bucket elsewhere, just in case, and try feeding and see if that helps.
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