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Eastern filbert blight (EFB)  (Anisogramma anomala)  is a serious disease of the European hazelnut  (Coryls avellana) . A single dominant gene for immunity to EFB from  C. avellana  `Gasaway' is being combined with good nut and kernel traits using a modified backcross approach. Additional sources of resistance would be highly desirable. Clones and seedlings of six other species  (C. columa, C. comuta, C. heterophylla, C. sieboldiana, C. amencana,  and C.  jaquemontii]  and a few interspecific hybrid selections were screened in the greenhouse to identify new sources of resistance.  C. jacquemontii  seedlings and  C. columa  clones were highly susceptible.  C. comuta, C. hetemphylla,  and  C. sieboldiana  clones were resistant, as were 86% of the  C. americana  seedlings tested. Five  C. americana  ×  C. avellana  hybrids from New York were resistant under field conditions. One of four  C. comuta  ×  C. avellana  and two of three  C. hetemphylla  ×  C. avellana  hybrids were resistant.

521 PB 483 RESISTANCE TO EASTERN FILBERT BLIGHT IN CORYLUS SPECIES AND INTERSPECIFIC HYBRIDS