Similar water-soaked spots form on the pods and enlarge into reddish brown lesions (Figure 6). These lesions enlarge to 10 mm or greater (Figure 5) and may kill the leaflet. Leaf symptoms initially appear as water-soaked spots that become necrotic, light brown lesions of irregular shape with distinct, bright yellow margins (Figure 4). If infection occurs early in pod development, the pod may become bent or twisted at the infection site (Figure 3). Sunken brown spots can form on the pods (Figure 2). These lesions may enlarge, coalesce, and fall out giving the leaves a tattered appearance. The initial foliar symptom of bacterial brown spot is small water-soaked spots that develop into distinctive necrotic brown spots about 3-8mm in diameter, often with a narrow, diffuse yellow margin (Figure 1). Common blight and halo blight are rarely observed nowadays presumably due to the routine use of certified seed. It is common in wet, cool years in snap and dry beans. These diseases can cause serious yield losses in heavily infected bean fields.īrown spot is no longer considered an economic problem in most years in New York. phaseoli, and halo blight, caused by Pseudomonas syringae pv.
syringae, common bacterial blight, caused by Xanthomonas campestris pv. There are three distinct bacterial diseases that have been found on snap and dry beans in New York: Bacterial brown spot, caused by Pseudomonas syringae pv.
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