Enanismo Amarillo Disease of Solanum andigena Potatoes is Caused by Potato Leaf Roll Virus

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Abstract
"Enanismo amarillo" disease which is perpetuated by infected seed tubers was widely distributed in fields of S. andigena ''Renacimiento'' potato in the potato-growing areas of central Peru. Symptoms in diseased plants of 7 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 7 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 .times. S. andigena cultivars was an additional symptom in affected plants of only 1 of them. Isolates of PLRV from plants of 2 different S. andigena cultivars with the disease induced secondary rolling of lower leaves in the S. tuberosum cv. Arran Pilot and an isolate from a plant of the S. tuberosum .times. S. andigena cv. Ticahuasi showing pronounced rolling of lower leaves induced "enanismo amarillo" disease as secondary symptoms in ''Renacimiento''. The disease constitutes the typical response of S. andigena to secondary infection with PLRV.

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