Lessons from 10 years of stakeholder adoption of a soil bioassay for assessing the risk of spinach Fusarium wilt

Although the maritime Pacific Northwest (PNW) is the only region of the United States suitable climatically for spinach seed production, the acidic soils are highly conducive to spinach Fusarium wilt caused by Fusarium oxysporum f. sp. spinaciae. A soil bioassay developed to quantify the risk of spi...

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Bibliographic Details
Published in:Plant pathology 2021-05, Vol.70 (4), p.778-792
Main Authors: Gyawali, Sanjaya, Derie, Michael L., Gatch, Emily W., Sharma‐Poudyal, Dipak, Toit, Lindsey J.
Format: Article
Language:English
Subjects:
Acidic soils
Agricultural practices
Bioassays
Correlation analysis
Crop rotation
Fusarium
Fusarium oxysporum
Fusarium wilt
Inbreeding
Limestone
Manganese
Parameter identification
regression
Regression analysis
Regression models
Risk
Risk assessment
seed production
Seeds
soil bioassay
Soil chemistry
Soil pH
Soil properties
Soil testing
Soils
Spinach
Vegetables
Wilt
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Summary:Although the maritime Pacific Northwest (PNW) is the only region of the United States suitable climatically for spinach seed production, the acidic soils are highly conducive to spinach Fusarium wilt caused by Fusarium oxysporum f. sp. spinaciae. A soil bioassay developed to quantify the risk of spinach Fusarium wilt in fields has been offered to seed growers annually since 2010. Soil sampled from growers' fields each winter was planted with highly susceptible, moderately susceptible, and partially resistant spinach inbred lines, and the plants rated weekly to calculate a Fusarium wilt severity index (FWSI) and the area under the disease progress curve (AUDPC). Results for 147 soils tested from 2010 to 2013 have been published. This study examined results for an additional 248 soils tested from 2014 to 2019 with the bioassay modified to include an option of agricultural limestone amendment to the soils tested. FWSI and AUDPC were affected significantly (p 
ISSN:0032-0862
1365-3059
DOI:10.1111/ppa.13335