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Etiology

Host Specificity of Colletotrichum gloeosporioides f. sp. aeschynomene and C. truncatum in the Leguminosae. G. J. Weidemann, Department of Plant Pathology, University of Arkansas, Fayetteville 72701; D. O. TeBeest(2), and R. D. Cartwright(3). (2)Department of Plant Pathology, University of Arkansas, Fayetteville 72701; (3)Department of Plant Pathology, University of Arkansas, Fayetteville 72701, Present address: Department of Plant Pathology, University of California, Davis 95616. Phytopathology 78:986-990. Accepted for publication 23 February 1988. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/Phyto-78-986.

The host range and virulence of Colletotrichum gloeosporioides f. sp. aeschynomene, used as the mycoherbicide Collego, and C. truncatum were compared on plant species within the Leguminosae. C. g. aeschynomene could be differentiated from C. truncatum on the basis of host range within the Leguminosae and on virulence within Pisum sativum and several other host genera. C. g. aeschynomene was pathogenic on species in nine host genera representing five tribes in the Papilionoideae, but was highly virulent only on Aeschynomene virginica and Lupinus arboreus. C. truncatum was pathogenic on species in six genera in two tribes, but was highly virulent only on Lathyrus odoratus, Vicia ervilia, and most cultivars of P. sativum. Host genera common to both fungi included Lupinus, Indigofera, Cicer, Lathyrus, Lens, Vicia, and Pisum. Morphological studies of C. g. aeschynomene and C. truncatum suggest that C. pisi is synonymous with C. truncatum and not C. gloeosporioides.