Rabbit Anti-Xaphf polyclonal antibody for ELISA. The common bean (Phaseolus vulgaris L.) is one of the most important crops worldwide in both economic and nutritional aspects. Common and fuscous blights of bean caused by Xanthomonas axonopodis pv. phaseoli and its variant "Xanthomonas axonopodis pv. phaseoli var. fuscans" (proposed name) occur frequently in temperate and tropical climates. Common blight, including fuscous blight, is one of the five major diseases of beans leading to important yield losses. Symptoms and epidemiology of these two diseases and ecology of the pathogens are thought to be similar, fuscous strains being generally more aggressive than X. axonopodis pv phaseoli strains.