Spatial and Temporal Distribution of <i>Iris yellow spot virus</i> and Thrips in Colorado Onion Fields

Fig. 3. Scatterplots illustrating the association of the incidence of onion plants with iris yellow spot (IYS) at harvest to percent soil sodium (r = 0.40, P = 0.011): (A) pH (r = -0.61, P < 0.0001); (B) plant population (r = -0.14, P = 0.082); (C), and thrips-days (r = 0.49, P < 0.0001); (D) in six commercial onion fields in western and northeastern Colorado during 2005 and 2006. A total of 218 plots was assessed among the six fields; data points from a given field are colored similarly.



Image from Plant Health Progress article:
Spatial and Temporal Distribution of Iris yellow spot virus and Thrips in Colorado Onion Fields