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Characteristics and pathogenicity of Pythium spp. associated with damping‐off of sugar beet in Ireland
Author(s) -
O'SULLIVAN E.,
KAVANAGH J. A.
Publication year - 1992
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.1365-3059.1992.tb02457.x
Subject(s) - pythium , sugar beet , biology , pythium ultimum , damping off , pathogenicity , botany , phycomycetes , horticulture , microbiology and biotechnology , seedling , biological pest control , inoculation
Five hundred and eight Pythium isolates were obtained from diseased sugar‐beet seedlings in the field from beet field soils in Ireland. Pythium sylvaticum and P. intermedium were the dominant species, together representing 86% of isolates, and P. salpingophorum, P. ultimum, P. mamillatum, P. oligandrum and Pythium ‘group HS’were the other species identified. The cultural characteristics of these species corresponded generally with previous descriptions, with the exception of P. sylvaticum and P. mamillatum, which varied in some respects. In glasshouse pathogenicity tests, P. sylvaticum, P. intermedium, P. salpingophorum, P. ultimum, P. mamillatum and one unidentified Pythium isolate caused pre‐emergence and early post‐emergence damping‐off of sugar‐beet seedlings. Isolates off. oligandrum and Pythium ‘group HS’were weakly pathogenic or not pathogenic to beet seedlings.