Premium
Colletotrichum gloeosporioides as the cause of stem tip dieback of cassava
Author(s) -
MOSES E.,
NASH C.,
STRANGE R. N.,
BAILEY J. A.
Publication year - 1996
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1996.tb02897.x
Subject(s) - biology , colletotrichum gloeosporioides , fungus , inoculation , ribosomal dna , botany , shoot , cultivar , horticulture , phylogenetics , gene , genetics
A fungus with morphological features corresponding to the group species Colletorichum gloeosporioides was consistently isolated from cassava with shoots showing dieback symptoms in Ghana. When four locally‐grown cultivars were inoculated with isolates of the fungus, they developed disease symptoms, which consisted of discrete dark brown lesions on the stems followed by defoliation. Koch's postulates were completed by re‐isolating the fungus from the inoculated plants. The relatedness of the isolates lo other members of the genus Calletotrichum , whose identities were well established, was investigated by comparison of the nucleotide sequence of domain 2 of their ribosomal DNA. The cassava isolates differed from authentic isolates of C. gloeosporioides by only one nucleotide among the 193 analysed. The causal agent of cassava stem tip dieback (STDB) is thus identified as a form of C. gloeosporioides.