Nemaya is a Robusta rootstock bred purely for nematode resistance, used to graft any Arabica variety onto resistant roots.
Nemaya is a pure Coffea canephora (Robusta) rootstock variety, bred by PROMECAFE-CIRAD-CATIE from a cross of two Robusta accessions (C. canephora T3561 x T3751), used exclusively for grafting. Any Arabica variety can be grafted onto Nemaya rootstock to gain resistance to root-knot and lesion nematodes (tolerant to Pratylenchus spp., resistant to Meloidogyne exigua, M. arenaria and M. paranaensis) without affecting the scion's cup quality.
Field notes
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Arabica of any variety can be grafted onto Nemaya rootstock, and WCR says grafting has no effect on cup quality.