Tetraploid Sources of Potato Resistance to Myzus persicae, Macrosiphum euphorbiae, and Empoasca fabae123

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Abstract
Six hundred clones of potato, Solanum tuberosum L. andigena (Juz. & Buk.), a tetraploid subspecies cultivated in the Andes of South America, were screened for resistance to the green peach aphid, Myzus persicae (Sulzer), and the potato aphid, Macrosiphum euphorbiae (Thomas). After one unreplicated and 2 replicated clonal selection cycles, resistance to M. persicae was confirmed in 6 clones and to M. euphorbiae in 13 clones. Five clones (N503-141, N503-246, N551-17, N551-18, N558-26) were resistant to both species. Also, 382 clones of S. t. andigena were screened for resistance to nymphal infestation and feeding damage (hopperburn) by the potato leafhopper, Empoasca fabae (Harris). After 3 selection cycles, 7 clones were resistant to infestation and 7 clones were resistant to hopperburn. Three clones (N511-14, N551-15, N551-16) were resistant to both hopperburn and nymphal infestation. Another clone, N502-26, was resistant to hopperburn despite relatively large nymphal infestations. Resistance to nymphal infestation also was confirmed for 7 clones of an agronomically-advanced population of S. tuberosum tuberosum (L.) None of the clones were resistant to all 3 target pests.

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