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Diagnostics Guide for Soybean Problems (Seedling to Flowering (Plants…
Diagnostics Guide for Soybean Problems
Seedling to Flowering
Plants Dead
In small areas of individual plants
Seedling blights and root rots
Phytophthora
Pythium
Rhizoctonia
Fusarium
Round burnt areas in field
Lightning damage
Plants Stunned
Leaves Discolored/ Root Injury
Soybean cyst nematode
Root Insects
White Grub
Grape Colaspis
Garden Symphylan
Chlorimuron or Imidazolinoneherbicide injury
Yellowing followed by necrosis
Glyphosate herbicide injury
Yellowing between veins
Mn Deficiency
Fe deficiency ( Iron)
Leaves malformed, puckered, or discolored
Soybean mosaic virus
Nutrient Deficiency
Thrips
Chloroacetamide herbicide Injury
Diphenyl herbicide injury
ALS Inhibitor herbicide Injury
Plant growth regulator herbicide injury
Stem bent or twisted
Plant growth regulator herbicide injury
Sandblasted Appearance
Two Spotted Spider Mite
Plants Normal in height but leaves Damaged
Leaves discolored or with lesion
Foliar Disease
Bacterial Blight
Septoria Brown Spot
Bacteria Pustule
Downy Mildew
Nutrient Deficiency
Leaves Torn
Hail or Hard Rains and Wind
Bacterial Blight
Bacterial Pustule
Small Holes in Leaves
Insect Damage
Southern Corn Rootworm
Bean Leaf Beetle
Japanese Beetle
Large Holes in Leaves
Insects
Grasshopper
Blister Beetle
Interveinal chlorosis or necrosis on leaves
Triazine herbicide injury
Contact burn or necrotic lesion
Contact Herbicide
Dyphenylether herbicide
Paraquat
Bentazon
Planting to Emergence
Poor Emergence
Seedling twisted, mishappen, or hypocotyl thickened underground
Dinitroaniline herbicide injury
Soil crust or compaction
Hypocotyl elongated but not reaching surface
Planted too deep
Seed swelled
Soil too wet or cold
Seed eaten or sprout cut
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 Dacay
Pythium
Fusarium
Rhizoctonia
Phomopsis
No Seed- Soil disturbed
Planter failure
Clogged Planter
Bird or rodent feeding
Flowering to Maturity
Plants normal height
Chlorotic Leaves or necrotic lesion
Leaf Diseases
Brown spot
Bacteria Pustule
Downy Mildew
Interveinal chlorosis & necrosis of leaves
Sudden death syndrome
Brown stem rot
Insects feedings on leave
Insect Damage
Japanese Beetle
Grasshopper
Cabbage or soybean looper
Green cloverworm
Green leaf beetle
Mexican bean beetle
Webworm or leaf roller
Soybean Aphid
Improper maturation
Plants die prematurely, lesion on or discoloration of stems
Stem & Root Rots
Pod & Stem Blight
Brown Stem Rot
Carcoal Rot
Stem canker
Anthracnose
Phytophthora
Plants remain green
Thiocarbamate herbicide injury
Bud Blight Virus
Damage to seeds or pods
Insects feeding
Grasshopper
Corn earworm
Fall armyworm
European corn borer
Abnormal color or shriveled seeds
Stink bugs
Pod & Seed diseases
Anthracnose
Downy Mildew
Purple seed stain
Pod & Stem blight
Stem canker
Soybean mosaic virus
Bacterial Blight
