Abstract
Soybean vein necrosis disease (SVN) is the most widespread virus of soybeans in the United States. This thrip-vetcored virus can cause foliar chlorosis and necrosis, and it can reduce soybean oil content, which may impact producers of high-oleic acid soybeans in the mid-Atlantic. The prevalence of SVN in Delaware is unknown. In addition, we hypothesized that cropping system (i.e., full-season versus double-cropped) beans may differ in SVN, likely owing to duration of exposure to viruliferous thrips. SVN incidence was assessed in 88 soybean fields (48 full season, 40 double crop following small grains) from 2015 to 2017. Each field was assessed at the vegetative growth stage and early reproductive stage. Following statistical analysis using a random mixed repeated measures model, data indicated that SVN incidence increased from 4.5 to 29.8% when comparing vegetative versus reproductive growth stages. SVN incidence was 50% lower in full-season compared with double-cropped soybeans. Our data indicate that double-cropped soybeans or late-planted soybeans may be at higher risk for SVN, and therefore producers of high-oleic acid soybeans should avoid late planting dates.
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