Northern Root Knot Nematode in Peanut Peanut Notes No. 84 2019
A farmer had a question about Northern Root Knot Nematode’s impact on peanut. Here is Dr. Shew’s answer.
Northern is the most common RK species in our area. It is not nearly as damaging as the peanut root knot but it can cause root and pod damage. Roots galls are small but the galling makes the root system prone to damage from root rotting fungi. It makes small galls on pods. Above ground, you’d see mild stunting and yellowing in patches. I’m not sure I’ve ever seen a bad case of it except where we deliberately infested soil. I’d expect to see problems, if any, associated with poor rotations.