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Soybean Problem Diagnostic Guide (Flowering to maturity (Plants normal…
Soybean Problem Diagnostic Guide
Planting to emergence
Poor emergence
No seed -soil distributed
Planter failure (clogged planter plate, etc.) Bird or rodent feeding
Seed normal, not swelled
Sil too dry, planted too shallow
Seed swelled
Soil too cold or wet
Seedlings twisted, misshapen, or hypocotyl thickened underground
Planted too deep
Seed eaten or sprout cut
Insects: Seed corn beetle, Seed corn maggot, Wireworm, Cutworm, Bird or rodent feeding
Seed rotten
Seed decay: Pythium, Fusarium, Rhizoctonia, Phomopsis, etc.
Flowering to maturity
Plants normal height
Chlorotic leaves or necrotic lesions
Leaf diseases: Brown spot, bacterial pustule, downy mildew
Two Spotted spider mites, Glyphosate herbicide injury
Interveinal chlorosis and necrosis of leaves
Sudden death syndrome (normal pith color)
Brown stem rot (reddish-brown pith color)
Insect feeding on leaves
Insect damage: Japanese beetle, grasshopper, cabbage or soybean looper, green cloverworm, bean leaf beetle, mexican bean beetle, webworm or leaf roller, soybean aphid
Improper maturation
Plants die prematurely, lesions on or discoloration of stems
Stem and root rots: pod and stem blight, brown stem rot, charcoal rot, stem canker, anthracnose, phytophthora
Plants remain green
Thiocarbonate herbicide injury, bud blight virus
Damage to pods or seeds
Insect feeding
Insects: grasshopper, corn earworm, fall armyworm, european corn borer
Abnormal color or shriveled seeds
Stink bug, Pod and seed diseases: Anthracnose, Downy mildew, Purple seed stain, pod and stem blight, stem canker, soybean mosaic virus, bacterial blight
Seedling to Flowering
Appearance
Plants dead
In small areas of individual plants
Seedling Blights and root rots: Phytophthora, Pythium, Rhizoctonia, Fusarium
Round burnt areas in fields
Lightning damage
Plants stunted
Leaves discolored, root injury
Soybean cyst nematode root insects: White Grub, Grape colaspis, Garden symphylan, imidazolinine or chlorimuron, Herbicide injury
Yellowing folloed by necrosis
Glyphosate herbicide injury (non-glyphosate-resistant soybeans)
Yellowing between veins
Mn or Fe deficiency
Leaves malformed, puckered, possibly discolored
Soybean mosaic virus, nutrient deficiency, thrips, chloroacetamide herbicide injury, diphenyl ether herbicide injury, ALS inhibitor herbicide injury, Plant growth regulator herbicide injury
Stems bent or twisted
Plant growth regulator herbicide injury
Sandblasted appearance
Twospotted spidermite
Plants normal in height but leaves damaged
Leaves discolored or with lesions
Foliar diseases: Bacterial blight, septoria brown spot Bacterial pustule, Downy mildew, Nutrient dificency
Leaves torn
Hail or hard rains and wind, Bacterial blight or pustule
Small holes in leaves
Insect Damage: Southern corn rootworm, Bean leaf beetle, Japanese Beetle
Large holes in leaves
Insect Damage: Grasshopper, Blister beetle
Interveinal chlorosis or necrosis on lower leaves
Trizazine herbicide injury
Contact burn or necrotic lesions
Contact herbicide: Diphenyl ether herbicide, Paraquat, Bentazon
