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Brown spot, also known as Septoria leaf spot, occurs in all soybean growing regions of the U.S. and is the most common foliar disease of soybean in Ohio. It primarily causes premature defoliation of the lower canopy, but can also infect seeds, pods, and stems. According to several experimental field trials, yield losses are limited on current cultivars.
Characteristic small, brown, irregular lesions surrounded by leaf chlorosis.
Symptomatic leaves are usually located in the lower canopy.