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From the greenhouse experiment (2011–2012), aphid counts on susceptible (−,−; Vernal), nematode resistant (+,−; PGI-437), aphid resistant (−,+; Rugged), and combined aphid and nematode resistant (+,+; Pershing) varieties. White bars represent control treatments without nematodes and grey bars represent treatments with nematodes. Values are means ±1SE
