VIEW ARTICLE

Etiology

Enanismo Amarillo Disease of Solanum andigena Potatoes is Caused by Potato Leaf Roll Virus. A. Rodriguez, Research Student, International Potato Center, Apartado 5969, Lima, Peru, Present address of senior author: Instituto Colombiano Agropecuario Apartado Aéreo 7984, Bogotá, Colombia; R. A. C. Jones, Virologist, International Potato Center, Apartado 5969, Lima, Peru. Phytopathology 68:39-43. Accepted for publication 6 June 1977. Copyright © 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-39.

“Enanismo amarillo” disease which is perpetuated by infected seed tubers was found to be widely distributed in fields of Solanum andigena ‘Renacimiento’ potato in the potato-growing areas of central Peru. Symptoms in diseased plants of seven different S. andigena cultivars were: marginal and interveinal chlorosis of leaflets, a marked upright habit of growth, and stunting. Although potato leaf roll virus (PLRV) was detected in diseased plants of all seven cultivars by aphid transmission to Physalis floridana seedlings and was the only virus consistently isolated from them, the rolling of lower leaves which is typical of secondary infection with this virus in S. tuberosum and S. tuberosum × S. andigena cultivars was an additional symptom in affected plants of only one of them. Isolates of PLRV from plants of two different S. andigena cultivars with the disease induced secondary rolling of lower leaves in the S. tuberosum cultivar Arran Pilot and an isolate from a plant of the S. tuberosum × S. andigena cultivar Ticahuasi showing pronounced rolling of lower leaves induced “enanismo amarillo” disease as secondary symptoms in Renacimiento. The disease, therefore, constitutes the typical response of S. andigena to secondary infection with PLRV.