What would be making the leaves on my potatoes curl in tight knots what is it...
What would be making the leaves on my potatoes curl in tight knots what is it lacking not all plants are doing it just some so think it must be a deficiency
Furnas County Nebraska
Leaf curling at this time of year is often due to herbicide drift. Is this a possibility? With our hot weather, even if a weed killer (herbicide) was applied on a calm day; the herbicide can volatize and then move on air currents to cause damage to nontarget plants. Other causes of leaf curling could be a virus disease (no cure, remove and destroy plants) or maybe aphids. With aphids, you would find the aphids inside the curled up leaves and/or the leaves would feel quite sticky. You might wish to take a sample to your local Extension office or send some pictures of the plants to Ask an Expert or to your local Extension office. Thank-you for using eXtension.
Here is a link to some information on potato leaf roll virus and other potato viruses.