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Percentage of sunflower crop affected by three necrotrophic diseases, Phomopsis (caused by Diaporthe spp.), and Sclerotinia head rot and Sclerotinia wilt/basal stem rot (caused by Sclerotinia sclerotiorum). The percentage was calculated by multiplying the percentage of fields with each disease by the average within-field percent incidence excluding unaffected fields, from survey data across North America. Data from National Sunflower Association (2018) and calculations from Gulya et al. (2019).
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