Volume 49 Number 2 Article 18
Year 1995 Month 4
Title: Field Resistance of 20 Strawberry Cultivars to Black Root Rot
Authors: K.B. Wing, M.P. Pritts and W.K. Wilcoz
Abstract:
Black root rot (BRR), a non-specific disease
typified by blackening of roots, with associated
poor growth and yield, is common in perennial
strawberry plantings worldwide.
Although the
causal.agent of blackening is often unknown,
Pythium spp., Rhizoctonia fragariae Husain &
McKeen and Pratylenchus penetrans (Cobb)
Filip. and Stek. have been identified in association with BRR. Distinct cultivar differences in
tolerance to BRR can be observed in commercial
fields, suggesting the possibility that manage
ment can be achieved by cultivar selection.
Twenty cultivars from various breeding programs throughout North America were planted
in the spring at two field sites (with and without
a history of BRR) in western New York and root
health was assessed during harvest the following
year.
The cultivars most resistant to BRR were
'Tristan', 'Earliglow,' and 'Midway,' while 'Allstar'
NY113 and 'Selva' were least resistant.
When
cultivar rankings at these sites were compared
with those of two other studies, correlations
were nonexistent to negative.
These data suggest
that the causes of BRR can differ among locations, and cultivar selection will be of no value
unless the causal organism at a particular site is
known.
Chemical names used: N-(2,6-dimethylphenyl)-N-methoxyacetyl) alanine methyl ester
(metalaxyl).
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