Tolerance of Carrot to Meloidogyne hapla. L. W. Yarger, Graduate Assistant, Department of Horticulture, Michigan State University, East Lansing 48824. L. R. Baker, Department of Horticulture, Michigan State University, East Lansing 48824. Plant Dis. 65:337-339. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-337.

Twenty-one cultivars and breeding lines of carrot (Daucus carota L.) were assayed for their response to northern root-knot nematode (Meloidogyne hapla) under greenhouse conditions. MSU 872 and MSU 5988 were considered tolerant, with three or four galls per root; and MSU 9555, MSU 1394, and Gold Pak 28 were susceptible, with 20–41 galls per root. In muck soil in naturally infested fields, Spartan Classic and MSU 872 were tolerant (averages of 22 and 23% galled roots, respectively), and MSU 1394 and MSU 9555 were susceptible to M. Hapla (averages of 45 and 49%, respectively).