These symptoms resemble those of bacterial pustule. This is a bacterial disease caused by Xanthomonas axonopodis pv glycines. Symptoms appear as minute, pale-green spots with raised centres that enlarge to irregularly shaped lesions. Most lesions have prominent pustules on the underside of the leaf. When the lesions join together, leaves become ragged and may drop from the leaf. Bacterial pustule rarely causes defoliation and yield loss. The pathogen can be transmitted by seed and can be spread by windblown rain, rain splash or by machinery during wet conditions. The disease is common in areas prone to warm and wet weather.Scouting is recommended between R1 through R6 of soybean developmental stages.
Some of the recommended management options are; use of resistant varieties and pathogen-free seeds.Crop rotation and plowing the field before planting also help to reduce field inoculum level. Avoid cultivation when the leaves are wet.
Than you for the clarification Mr. Murithi
You are welcome, hope the information is helpful.