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Stephen N. Wegulo and Miguel Vilchez

day the cultivars were transplanted and served as a source of inoculum. Average disease severity on these plants at the time they were placed around the benches was 3 on a scale of 0 to 5 (0 = no symptoms; 1 = 1% to 20% of foliage covered with powdery

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Yunwen Wang, Huangjun Lu, Richard N. Raid, Gregg S. Nuessly, and Georgy Faroutine

scored for disease incidence and severity. The disease incidence was calculated by the percent of infected plant among all plants in each row. The disease severity of a plant was evaluated using the 0–4 rating system as reported by Bull et al. (2007

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Mohsen Mohseni-Moghadam, Christopher S. Cramer, Robert L. Steiner, and Rebecca Creamer

were to screen onion germplasm for IYSV tolerance/resistance in terms of disease severity and incidence to determine the correlation between severity ratings and a measure of virus titer in the plant and to determine the relationship of plant sampling

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Jiaqi Yan, Megan M. Dewdney, Pamela D. Roberts, and Mark A. Ritenour

to 5–10 ppm ethylene and continuous light to speed lesion appearance (Baldassari et al., 2007; Brodrick and Rabie, 1970 ; Er et al., 2013 ). The number of new lesions on each fruit (disease severity) and percent of fruit that developing new lesions

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Susan C. Miyasaka, Charles E. McCulloch, and Scot C. Nelson

taken at about five months after planting ( Table 1 ). Horsfall and Barratt (1945) proposed a disease assessment scale comprising logarithmic, not linear, disease severity classes that are symmetrical about 50%. We used a modified Horsfall

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Andre Luiz Biscaia Ribeiro da Silva, Joara Secchi Candian, Elizanilda Ramalho do Rego, Timothy Coolong, and Bhabesh Dutta

Fall 2018 and Spring 2019, respectively. Severity of BR ratings was conducted at weekly intervals starting from 7 DPI and were performed until harvest. In each screening, an overall score of BR severity was assigned for each plot using the disease

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Michelle A. Grabowski and Dean K. Malvick

Chambers, Chagrin Falls, OH) set to 18 °C for 14 h of light and 16 °C for 10 h of dark. Lesion length was measured at 4 and 14 d after inoculation (DAI) as a rating of disease severity. As a result of a unique and unexpected resistance response of

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Ravi Bika, Cristi Palmer, Lisa Alexander, and Fulya Baysal-Gurel

, 18 and 24 °C, and 18.5 and 23 °C, respectively; and average RH was 66%, 68%, and 62%, respectively. Data recording. Evaluations were made on botrytis blight disease severity and phytotoxicity using a 1 to 5 ordinal scale [1 = no symptom (0%), 2 = 1

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Leah L. Granke, Layla E. Crawford, and Mary K. Hausbeck

-bearing plants remained on the greenhouse bench for the duration of the experiment. Powdery mildew disease severity was assessed every week in the glasshouse (six ratings, 375 plants) and every 2 weeks (seven ratings, 209 plants) in the polyethylene greenhouse

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David Noshad, Andrew Riseman, and Zamir Punja

tap root, most leaves chlorotic with some leaf abscission; or 5 = plant is dead. A plant disease index (PDI) was developed based on both disease incidence (DI) and disease severity (DS) as follows: where DS = disease severity (i.e., average DPR