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The effects of barley yellow dwarf virus and powdery mildew in oats and barley with single and dual infections
Author(s) -
POTTER L. R.
Publication year - 1980
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.1744-7348.1980.tb03891.x
Subject(s) - barley yellow dwarf , powdery mildew , mildew , biology , erysiphe graminis , agronomy , luteovirus , hordeum vulgare , virus , poaceae , horticulture , plant virus , virology
SUMMARY Prior infection by barley yellow dwarf virus (BYDV) initially suppressed, then subsequently enhanced the amount of powdery mildew ( Erysiphe graminis DC ex Mérat) on oat cv. Maldwyn and barley cv. Proctor. Carbendazim applied as a spray decreased mildew on virus‐free and BYDV‐infected plants, but had no effect on virus symptoms. In oats, both mildew and BYDV infection significantly increased the number of heads but decreased the number of grains per head. Mildew infection of BYDV‐infected plants had no further effect. BYDV significantly increased the 1000 grain weight of oats, but mildew caused no significant alteration in grain weights of either virus‐free or BYDV‐infected plants. Both mildew and BYDV reduced the yield of oats, but mildew infection of BYDV‐infected plants caused no further significant alteration. Percentage crude protein was increased in grain from both BYDV‐infected and mildew‐infected oats, but significantly only in BYDV‐infected plants. In barley, the number of spikelets on the main shoot, the number of heads and the number of grains per head were all significantly reduced by BYDV but not by mildew. Mildew infection of BYDV‐infected plants had no further effect. Both BYDV and mildew significantly reduced the 1000 grain weight of barley, but mildew infection of BYDV‐infected plants caused a significant increase in 1000 grain weight compared to mildew‐free, virus‐infected plants. The yield of barley was significantly reduced by mildew and by BYDV, but no additional yield loss was caused by mildew infection of BYDV‐infected plants. The percentage crude protein of barley was increased, but not significantly, by mildew and by BYDV.