Knowledgebase
I think my Potatoes in my garden may have "Late Blight" #775691
Asked October 18, 2021, 12:10 PM EDT
Jefferson County Colorado
Expert Response
FYI....I have two good jpegs of the problem potatoes, but when I try to upload them I am getting an error "Do not use images you downloaded from the internet. Only use pictures you produced." which is preventing me sending you the images. These are images I took, so not sure why your app is preventing me uploading them.
I have several questions about your potatoes. Did you notice any wilting and browning of the potato foliage? Could the mushy potatoes have been frozen or frosted?
A mushy potato could be caused by many things. If most of the potatoes look normal and don't have mushy parts, they are probably fine. It would be a good idea to store the varieties separately, with attention to temperature and humidity as much as possible.
It is recommended that potatoes should be rotated for 3 years, and this would include all related plants, such as tomatoes, peppers, and eggplants. This is not easy in a small garden.
Below is the url for more information from CSU Extension. I don't know why you can't upload your photos.
https://extension.colostate.edu/topic-areas/yard-garden/potatoes-in-the-home-garden-7-617/
Hello,
Another option is to email the photos to the Jeffco Plant Diagnostic Clinic. Put your ask extension number in the Subject field.
Best regards,
Mari Hackbarth, Clinic Coordinator
- Did you notice any wilting and browning of the potato foliage?
- The plants were hit by a hard frost a week earlier, so I was not able to see any wilting or browning of the foliage
- Could the mushy potatoes have been frozen or frosted?
- Only two were mushy and no others. Seem odd that only two would have frozen.
Hello Dave
Thanks for the picture. It is not possible to tell from a picture if the mushy potato has late blight, but if you could submit a sample of that potato to the clinic we could test it and either confirm or rule out late blight. There is a $20 charge for the culture of your sample. Your potatoes that look healthy are OK to eat.
Thanks for contacting the Plant Clinic.
Charlotte G.