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Soybean Diagnostic Guide (Seedling to Flowering (Round Burnt Area…
Soybean Diagnostic Guide
Planting to Emergence
Seedling twisted, misshapen, or Hypocotyl thickened underground
Herbicide Injury, Soil crust or compaction
Hypocotol elongated, but not reaching surface
Planted Too deep
Seed Swelled
Soil too cold or wet
Seed Eaten or Sprout out
INsects: Seed corn Beetle , Seed Corn Maggot , Wireworm, Cutworm, Bird or rodent Feeding
Seed Normal, not swelled
Soil too dry, planted too shallow
Seed Rotten
Seed Decay: Pythium, Fusarium, Rhizoctania, Phomopsis
No seed, soil disturbed
Planter Failure, Bird or Rodent Feeding
Seedling to Flowering
Round Burnt Area
Lightning Damage
Plants Dead in Small Areas
Seedling Blights and Root Rots, Phytopthora
Leaves discolored or with lesions
Foliar Diseases: Bacterial Blight, Sephoria Brown Spot, Bacterial Pustule, Downy Mildew
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
Sandblasted Appearance
Twospotted Spider-mites
Stems Bent or twisted
Plant Growth Regulator, Herbicide Injury
Leaves malformed
Soybean Mosiac Virus, Nutrient Deficiency, Thrips, Herbicide Injury
Yellowing between Veins
Mn or Fe Deficiency
Yellowing followed by necrosis
Glyphosate Herbicide Injury
Leaves Discolored Root Injury
Soybean Cyst Nematode, Root Insects: White Grub Grape Colaspis, Garden symphylan
Interveinal Chlorosis or necrosis on lower leaves
Triazine herbicide Injury
Contact Burn or necrotic lesions
Contact Herbicide: Diphenyl ether herbicides, Paraquat, Bentazon
Flowering to Maturity
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
Plants remain green
Bud blight virus
Insect feeding on leaves
Insect Damage: Japanese Beetle, Grasshopper, Cabbage or soybean Looper
Insect Feeding
Insects: Grasshoppers, Corn Earworm, Fall Armyworm, European Corn Borer
Interveinal chlorosis and necrosis of leaves
Sudden Death Syndrome, Brown Stem Rot
Abnormail color or shriveled seeds
Stink Bug, Pod and Seed Diseases: Anthracnose, Downy Mildew, Purple seed stain, Pod and Stem Blight, Stem Canker, Soybean Mosiac Virus, Bacterial Blight
Chlorotic Leaves or necrotic lesions
Leaf Diseases: Brown Spot, Bacterial Pustule, Downy Mildew
