New Zealand Journal of Crop and Horticultural Science abstracts
Pathogenic variability in Mycosphaerella fijiensis Morelet,
cause of black Sigatoka in banana and plantain
R. A. FULLERTON
T. L. OLSEN
The Horticulture and Food Research Institute
of New Zealand
Mount Albert Research Centre
Private Bag 92169
Auckland, New Zealand
Abstract Sixty-three strains of Mycosphaerella
fijiensis Morelet obtained from various Musa hosts in a range of
different countries and localities were inoculated to juvenile plants of a
standard set of Musa genotypes. Individual strains had consistent but
different patterns of pathogenicity on the host set. Some genotypes (SF215,
II-249 (`Saimea'), `Grande Naine') were susceptible to practically all
isolates. Others, e.g., `T8' and `Calcutta', were resistant to some isolates
but susceptible to others. Strains from Papua New Guinea and the Pacific
Islands exhibited a wide range of pathogenic diversity. Some strains from those
regions were pathogenic on juvenile plants of genotypes commonly used as
sources of resistance in breeding programmes (`Calcutta', `Paka', and `Pisang
Lilin'). These strains may threaten resistant progeny derived from those
genotypes. Analysis of pathogenicity of strains collected over 4 years in
Rarotonga, Cook Islands, has confirmed field observations that `Paka'
resistance is no longer effective on that Island. `Paka' virulence has been
found to be widespread in strains from the Pacific Islands and Papua New
Guinea. Juvenile plants of `Yangambi' (AAA), generally considered to be
resistant to M. fijiensis, were susceptible to strains which were
virulent on `Paka'. The availability of pure cultures of strains with
differential virulence on specific Musa genotypes will facilitate the
analysis of the inheritance of resistance to M. fijiensis.
Keywords banana; diseases; Sigatoka; Musa;
Mycosphaerella; M. fijiensis; M. musicola; pathogenic
diversity
New Zealand Journal of Crop and Horticultural Science, 1995, Vol. 23:
39-48
0114-0671/95/2301-0039 $2.50/0 (c) The Royal Society of New Zealand
1995
PDF file of entire paper: medium quality (774K); (scanned from paper original: notes about this process)
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