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A Comparative Study of Helminthosporium sativum Pam., King and Bakke and H. victoriae Meehan and Murphy on Oats 1
Author(s) -
Brown A. R.,
Miller J. H.
Publication year - 1954
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1954.00021962004600020003x
Subject(s) - miller , sativum , citation , horticulture , library science , biology , computer science , ecology
PRIOR to the epiphytotic in 1946 of the new oat blight and the publications of Meehan and Murphy (10,11) there were very few references in the literature to any Helminthosporium species parasitizing oats except to H. avenae Eidam. During this period there were many notices in the Plant Disease Reporter, United States Department of Agriculture, dealing with H. sativum as the causal agent of a foot rot, or head and leaf blotch of barley, wheat and certain grasses, but only 'an occasional report of this fungus on oats. There are now, apparently, differences of opinion among plant pathologists and oat breeders concerning the specific identities of H. sativum and H. victoriae. For example, Luttrell (8) showed practically no morphological differences of conidia between the two. Later, however, he (9) said, "Isolates in the H. victoriae group tended to produce smaller, paler, thinner-walled conidia, in this respect resembling H. setariae more closely than H. sativum." He then raised the question of whether these differences are sufficient to necessitate the recognition of a distinct species. Dickson (3) considered H. victoriae similar in morphology to H. sativum, and Rosen (16) designated the cause of H. victoriae blight as "(H. sativum var.? H. victoriae)".