Yukon Gold Displaying Potato Virus 7 Symptoms (IMAGE) American Phytopathological Society Caption A, Local hypersensitive resistance (HR) reaction resulted in wilting and dying of inoculated leaves. B, Systemic mottle and HR expressed as yellowing, necrotic rings and spots, and vein necrosis on upper noninoculated leaves. C, Severe HR symptoms on upper noninoculated leaves. D, Plants inoculated at 3 weeks after transplanting became dead by 6 weeks postinoculation compared with plants inoculated at a later age (right). Credit Mohamad Chikh-Ali, Lisa T. Tran, William J. Price, and Alexander V. Karasev Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.