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Download PDF Healthy area duration (HAD) can deliver robust data on the impact of disease. CPM explores the concept and how it’s unpicking some of the physiological effects associated with fungicides. Septoria decreases source capacity by reducing green leaf area which can have a big impact on yield. By Tom Allen-Stevens The level of disease control achieved with a fungicide can be a subjective measurement. Walk into a set of plots on two different dates following treatment and you can draw slightly different conclusions about how effective the products on trial were. “I have a bit of a bugbear about snapshots in time,” comments Julie Smith, principal research scientist in crop pathology at ADAS. “To properly understand the negative impact of disease on yield you need to account for canopy size and this requires a more robust methodology than a single assessment, at a particular point in time.” There’s also the question of the additional effects of fungicides and how these are assessed. “I’m always sceptical of the supposedly ‘disease-free’ crop – every field in every season comes under attack from billions of spores and there’ll usually be septoria present in a winter wheat crop, even if it’s at a…
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