As soybean fields mature and the harvest season approaches, growers need to remain vigilant against late-season diseases. These infections can strike quickly, causing significant yield and quality losses if left unchecked. 

This article delves into the world of late-season soybean diseases, exploring their signs, symptoms, conducive conditions, and crucial management strategies to help farmers protect their crops and secure a successful harvest.

Interveinal chlorosis followed by necrosis

Blue fungal growth on the crown/root (not always present)

Early planting, high rainfall, poorly drained soils

Blood red stem coloration on the stem near the soil line

Reddish reproductive structures (perithecia) on the root

Gray or tan inner with red to brown borders

Warm, humid conditions during reproduction

Foliar fungicides can help, but timing does not coincide with R3 applications

Necrotic leaves remain attached to petioles

Black specks (microsclerotia) in the root and lower stem

Microsclerotia on the outside of the root