Causal agent: Blumeria graminis f. sp. hordei.
Symptoms: first visible signs are fuzzy white to pale grey tufts of mycelia and conidia on the upper surfaces of leaves and leaf sheaths (especially on lower leaves) and sometimes on the spikes. Older fungal tissue is yellowish grey and can be easily rubbed off. Plant tissue becomes chlorotic or necrotic. Spherical black cleistothecia may develop.
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