What pathogen is responsible for Dry Bean Halo Blight?

Dry Bean Halo Blight is caused by a bacterial pathogen, specifically Pseudomonas syringae pv. phaseolicola. This bacterium infects the leaves of dry beans and leads to the characteristic symptoms of yellowish-green halos around the lesions. The focal point of this condition is the bacterial infection, which spreads through water droplets and contaminated seeds, leading to significant crop loss if not managed properly.

The correct answer highlights the importance of understanding plant pathogens in the context of agronomy and pest management strategies. Identifying the causative agent is vital for effective control measures, such as the use of resistant bean varieties, crop rotation, and proper sanitation practices in farming operations. Recognizing that this condition is not caused by a virus, fungus, or protozoan helps focus research and management efforts on the correct avenues for addressing and mitigating the impact of Dry Bean Halo Blight.