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Resistance Risk of Corn Pathogens to QoI Fungicides

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In many corn growing regions all over the world different fungal diseases can periodically cause significant yield losses and affect quality of the grain. Corn seedlings, leaves, stalks and ears can be heavily diseased. Most of pathogenic fungi belong to the Ascomycetes or Deuteromycetes, but also Basidiomycetes and Oomycetes are pathogenic on corn. The occurrence of a disease depends on the region, climatic conditions, the variety grown and the agricultural practice. Fungicidal applications help to control such diseases and may lead to increased yield. Compounds which are demethylation inhibitors (DMI) or quinone outside inhibitors (QoI) are active against most important corn diseases. Resistance management is recommended to maintain the effectiveness of these compounds. Three factors play an important role in the development of resistance to a fungicide: fungicide risk, pathogen risk and agronomic risk. These are discussed and explained.
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Keywords: CORN DISEASES; QOI; RESISTANCE RISK

Document Type: Research Article

Publication date: 01 October 2012

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