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Potato leaf spots
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Author:  mschmitt [ Tue Apr 28, 2009 4:08 pm ]
Post subject:  Potato leaf spots

My potatoes are very happy and healthy. However, recently I am noticing some brown splotches on the lower part of some of the leaves. I am hoping it is the result of too much water but would like some ideas. I am attaching a photo below.

Attachments:
File comment: Here is a picture of the brown leaf splotches.
Potato leaf spot 001.JPG
Potato leaf spot 001.JPG [ 55.93 KiB | Viewed 255326 times ]

Author:  sandih [ Wed Apr 29, 2009 8:39 pm ]
Post subject:  Re: Potato leaf spots

are the areas that are brown also very thin? Looks like there's been a pest sucking the juice out of the leaves to me.

Author:  mschmitt [ Thu Apr 30, 2009 7:04 am ]
Post subject:  Re: Potato leaf spots

Yes they are thin. Any idea of what kind of pest it could be?

Author:  sandih [ Mon May 11, 2009 4:02 pm ]
Post subject:  Re: Potato leaf spots

Could be 4-line plant bug. They have bright red underbelly and suck the juice out of leaves enough that it makes the leaf wilt or makes it look like a fungal disease.

Author:  mschmitt [ Mon May 11, 2009 5:08 pm ]
Post subject:  Re: Potato leaf spots

You are correct on the 4-line plant bug. I saw them on the folliage. I sparyed them with some clove insectacide and it seems to work pretty good. Thanks for your input. It's one of the few things that product seems to work on.

Author:  sandih [ Tue May 12, 2009 9:09 am ]
Post subject:  Re: Potato leaf spots

The other good thing is that the 4-line bug disappears when the weather turns hot.

Author:  mschmitt [ Tue May 12, 2009 9:19 am ]
Post subject:  Re: Potato leaf spots

Coinsidentally so do the potatoes.

Author:  sandih [ Wed May 13, 2009 8:22 am ]
Post subject:  Re: Potato leaf spots

darn the luck

Author:  PeteD [ Sun Jun 21, 2009 10:22 am ]
Post subject:  Re: Potato leaf spots

We, too have spots on the leaves of our potatoes. See the pictures.

Is this the dreaded blight? or something less sinister?

All help would be greatly appreciated. This is our first season with Potatoes.
For reference, the varieties are Vivaldi, Dunluce and Maris Piper.

Thanks,
Pete

Attachments:
Potatoleaf3s.jpg
Potatoleaf3s.jpg [ 9.18 KiB | Viewed 255153 times ]
potatoLeaf2s.jpg
potatoLeaf2s.jpg [ 8.57 KiB | Viewed 255149 times ]
potatoLeaf1s.jpg
potatoLeaf1s.jpg [ 9.69 KiB | Viewed 255149 times ]

Author:  northwesterner [ Sun Dec 30, 2012 11:30 am ]
Post subject:  Re: Potato leaf spots

I found a photo of the bug online so am posting it for my benefit and those others who will be working on another crop of potatoes soon. Thanks, Sandi!

Attachment:
File comment: Here is an image of the four-lined bug from the Purdue University ag site. I haven't seen this one in my yard yet, but it is usually only a matter of time before they find their way here. Since it's about time to plant potatoes, it's time to start looking out for the various pests.
4lined_plant_bug-plant[1].jpeg
4lined_plant_bug-plant[1].jpeg [ 42.24 KiB | Viewed 254493 times ]

Author:  sandih [ Sun Dec 30, 2012 12:11 pm ]
Post subject:  Re: Potato leaf spots

Just remember that potatoes are not normally harmed by this bug; it just makes the foliage look bad. Plant organic seed potatoes in February and harvest them in May.

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