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Grain yield reductions in spring barley due to barley yellow dwarf virus and aphid feeding
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2005
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T.F. Kennedy, J. Connery. (2005) Grain yield reductions in spring barley due to barley yellow dwarf virus and aphid feeding. Irish Journal of Agricultural and Food Research 44: 111–128
Abstract
The occurrence and control of barley yellow dwarf virus (BYDV) in spring barley was
investigated, at Oak Park, in the periods 1990 to 1993 and 1996 to 2001. Barley was
sown in March and April and treated with either organophosphorous or pyrethroid
aphicide at various plant growth stages. The most common aphid encountered was
Sitobion avenae and MAV the most common strain of BYDV. In untreated plots of
March- and April-sown barley, 0.85% and 5.9%, respectively, of tillers had virus symptoms.
Best control of symptoms, from a single aphicide in March- and April-sown
crops, was a treatment at growth stage (g.s.) 14. This treatment contributed 77% of the
reduction in symptoms recorded for multiple treatments in April-sown plots. The
reduction in grain yield due to high, moderate and low BYDV infection in April-sown
barley was 1.1 t/ha (20%), 0.65 t/ha (10%) and 0.36 t/ha (7%), respectively. In Marchsown
barley, pyrethroid aphicide applied at g.s. 14 significantly improved grain yield
by 0.26 t/ha (4%). In the season having the most severe BYDV outbreak, a pyrethroid
aphicide at g.s. 14 was best in controlling yield loss. Pyrethroid aphicide gave better
control of symptoms and better yields than organophosphorous aphicide. The estimated
yield reductions in untreated April-sown barley due to feeding damage by Sitobion
avenae was 0.71 t/ha and 0.83 t/ha (10.6% and 11.3%) in the two seasons in which this
aphid was plentiful. In the three seasons in which Metopolophium dirhodum was recorded
the estimated yield reductions were 0.32 t/ha, 0.48 t/ha and 0.43 t/ha (5.2%, 5.6% and
5.7%).