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Planting to Emergence (Poor Emergence (Seedlings twisted, misshapen, or…
Planting to Emergence
Poor Emergence
Seedlings twisted, misshapen, or hypocotyl thickened underground
Dinitroaniline herbicide injury
Soil crust or compaction
Hypocotyl elongated but not reaching surface
Planted too deep
Seed swelled
Soil too cold or wet
Seed eaten or sprout cut
Insects
Seed corn maggot
Wireworm
Seed corn beetle
Cutworm
Bird or rodent feeding
Seed normal, not swelled
Soil too dry, planted too shallow
Seed rotten
Seed decay
Fusarium
Rhizoconia
Pythium
Phomopsis, etc
No seed--soil disturbed
Planter failure
Bird or rodent feeding
Seedling to flowering
Plants stunted
yellowing between veins
mn or fe defficency
leaves malformed, puckered possibly disclored
mosaic disease, trips, herbicide injury
yellowing followed by necrosis
glyphosate herbicide injury
stem bent or twisted
plant growth regulator herbicide injury
leaves discolored, root injury
soybean cyst nematode, root insects: white grub, Grape colapis, Garden symphylan, and herbicide
sandblasted apperance
two spotted spider-mites
Plants normal in height but leaves damaged
small holes in leaves
shouthern corn rootworm, bean leaf beetle, Japanese beetle
large holes in leaves
grasshopper and blister beetle
leaves torn
hail and wind
Interveinal chlorosis or necrosis on lower leaves
triazzine herbicide injury
leaves discolored or with lessions
bacterial blight, septoria brown spot, bacterial pustule, downy mildew
contact burn or necrotic lesions
diphenyl ether herbicides, Paraquat, and bentazon
Plants Dead
In small areas of individual plants
Seedling blights and root rots: phytophthora, pythium, rhizoctonia, fusarium.
Round burnt areas in field
lightning damage
Flowering to Maturity
Improper maturation
Plants die prematurely, lesions on or discoloration of stems
pod and stem blight, brown stem rot, charcoal rot, stem canker, anthracnose, phytophthora
plants remain green
Thiocarbamate herbicide injury, bud blight virus
Damage to pods or weeds
Insect feeding
Grasshoper, corn earworm, fall armyworm, European corn boer
abnormal color or shriveled seeds
stink bug, pod and seed disease. anthracnose, downy mildew, purple seed strain, pod and stem blight, stem canker, soybean mosaic virus, bacterial blight
Plants normal hieght
Interveinal chlorosis and necrosis of leaves
sudden death syndrome, brown stem rot
Insect feeding on leaves
Japanese beetle, grasshopper, cabbage or soybean beetle, green clover, bean leaf beetle, Mexican beetle, webworm or leaf roller, soybean aphid
Chlorotic leaves or necrotic lesions
Brown spot, bacterial pustule, downy mildew, two-spotted spider mites
