| tomato chocolate spot virus, a member of a new torradovirus species that causes a necrosis-associated disease of tomato in guatemala. | tomatoes in guatemala have been affected by a new disease, locally known as "mancha de chocolate" (chocolate spot). the disease is characterized by distinct necrotic spots on leaves, stems and petioles that eventually expand and cause a dieback of apical tissues. samples from symptomatic plants tested negative for infection by tomato spotted wilt virus, tobacco streak virus, tobacco etch virus and other known tomato-infecting viruses. a virus-like agent was sap-transmitted from diseased tissue t ... | 2010 | 20376682 |