Effect of Nitrogen Fertilization and Seed Contamination on Epiphytic Populations of <i>Xanthomonas axonopodis</i> pv. <i>allii</i> and Development of Xanthomonas Leaf Blight of Onion

Fig. 2. Epiphytic populations of Xanthomonas axonopodis pv. allii strain R-O177 on onion in relation to nitrogen fertilization rates in 2003 (a) and 2004 (b). Nitrogen was available to plants at approximately 38 and 155 kg/ha in the 0-kg/ha treatment in 2003 and 2004, respectively, from residual soil nitrates.



Image from Plant Health Progress article:
Effect of Nitrogen Fertilization and Seed Contamination on Epiphytic Populations of Xanthomonas axonopodis pv. allii and Development of Xanthomonas Leaf Blight of Onion