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Severe powdery scab (caused by Spongospora subterranea) occurred in potato tubers harvested from a field trial, which measured effects of agronomic treatments (nitrogen fertiliser rates, irrigation intensities, previous crop rotations) on potato yields. Nitrogen application (400 kg N ha−1) increased weight of tubers per plant by 38 %. Incidence and/or severity of powdery scab were increased by nitrogen...
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