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The effects of Pythium sylvaticum , seed‐borne pathogens and seed treatments on the emergence of brassica seedlots of high vigour
Author(s) -
WHITE J. G.,
HO R. K.
Publication year - 1988
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1988.tb02041.x
Subject(s) - metalaxyl , biology , brassica , seed treatment , inoculation , agronomy , horticulture , fungicide , germination
SUMMARY The emergence from brassica seedlots designated by seed merchants as being of high vigour was measured in sterilised soil and in sterilised soil re‐inoculated with Pythium sylvaticum. The mean emergence level of 93·9% in the former compared favourably with the known mean total viability of the seedlots (97·7%). However, P. sylvaticum reduced emergence of 10 out of 16 untreated seedlots. The majority of seedlots gave > 75% emergence but in three cases emergence was reduced by 32·5–40·0%. The effects were not related directly to time taken to emerge, nor were the seedlots most affected those with high levels of infection. A compound seed treatment containing metalaxyl, fenpropimorph and gamma‐HCH restored high emergence levels.