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Etiology

Identification of Additional Habitats of Nectria haematococca Mating Population VI. Hans D. VanEtten, Associate Professor, Department of Plant Pathology, Cornell University, Ithaca, NY 14853; Phytopathology 68:1552-1556. Accepted for publication 16 May 1978. Copyright © 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-1552.

One hundred and fifty-two isolates of Fusarium solani were tested for ability to cross with two hermaphroditic isolates of opposite mating type of Nectria haematococca mating population VI. Of the 44 isolates which produced a fertile cross, 21 were obtained from diseased pea and at least two isolates were obtained from diseased parts of each of the following plants: chickpea, potato, tuliptree, alfalfa, cottonwood, and sainfoin. Most of the isolates identified as members of mating population VI were tested for virulence on pea. In general, the most virulent isolates on pea originally had been isolated from pea. However, several of the isolates obtained from habitats other than pea were as virulent as or more virulent than some of those from pea. These results indicate that isolates of N. haematococca mating population VI pathogenic on pea can be found in a variety of habitats.