Robuta

https://www.uidaho.edu/extension/publications/bul-1024 Powdery Scab of Potato | University of Idaho Powdery scab is a formidable and damaging fungus-like pathogen that damages potatoes worldwide. It causes gall formation on roots as well as lesions on the... powdery scabpotatouniversityidaho https://en.wikipedia.org/wiki/Powdery_scab Powdery scab - Wikipedia powdery scabwikipedia