Figure 1. Leaf symptoms of Cercospora kikuchii, which causes purple seed stain of soybean seeds. Leaf symptoms begin as a light purple color that extends over the leaf and develops a leathery appearance.
Figure 2. Field infected with cercospora leaf blight of soybeans. The pathogen overwinters on infested debris or seed.
Figure 3. Close-up of soybean seeds with purple seed stain, caused by a fungal disease, Cercospora kikuchii. Infected seeds have a pink-to-purple discoloration on their seed coats.
Table 1. Efficacy of select foliar fungicides for control of Cercospora leaf blight (Smith, 2020).
* E=Excellent; VG=Very Good; G=Good; F=Fair; P=Poor
The foregoing is provided for informational use only. Please contact your Pioneer sales professional for information and suggestions specific to your operation. Product performance is variable and depends on many factors such as moisture and heat stress, soil type, management practices and environmental stress as well as disease and pest pressures. Individual results may vary.