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Knee High (V7) to Tasseling (VT) (Plants Discolored, White, Yellow, or…
Knee High (V7) to Tasseling (VT)
Plants Have Abnormal Shape or Position
Stalks collapse from rot
2,4-D herbicide injury
Cutworm
European corn borer
stalks collapse from stem rot
Pythium stalk rot
Bacterial Stalk rot
Plants lean or fall over
Nematodes
2,4-D herbicide injury
Strong winds before brace roots have formed
Mechanical injury
Rootworm
brace roots malformed or missing
2,4-D, Dicamba
slugs
Herbicide injury
Plants Malformed and Discolored
Galls; silvery white then black
Smut
stunting red leaves, striping
Maize dwarf mosiac and corn stunt
Maize chlorotic Mottle
Stunting, tillering, twisting
Crazy Top Disease
narrow leaves, striping
Srghum downy mildew
Plants Discolored, White, Yellow, or Purple on Leaves
Interveinal chlorosis or purpling
Amino acid synthesis inhibitor herbicide
Purpling or reddening of leaves from tip backward affects lower leaves initially leaf tips may later turn dark brown and die
Phosphorus deficiency
yellowing of necrosis of lower leaves beginning at leaf tip
Herbicide injury
Photosynthetic inhibiting herbicide
yellow to white interveinal striping in leaves or reddening of leaves
Magnesium deficiency
Yellowing of leaf margins, beginning at tips, affected tissue later turns brown and dies
Potassium deficiency
Pale green to white striping on leaves
iron deficiency
Yellowing of plants, beginning with lower leaves at leaf tip along midrib
Nitrogen deficiency
standing water
upper leaves show pale green to yellow interveinal discoloration
manganese deficiency
White stripes and some white leaves on scattered plants only
Genetic Stripe
Leaves completely white, or top leaves or scattered leaves white
Extreme heat
lesions or necrotic spots on leaves
Paraquat, atrizine + oil or other photosynthetic inhibitor herbicides
Foliar diseases
stewarts leaf blight
Helminthosporium leaf blights
anthracnose
southern, and norethern, leaf spot
yellow leaf blight
upper leaves brown and sticky
corn leaf aphid
Leaves have a window effect but niether surface is broken
Corn blotch leaf miner
leafhopper eggs
yellow or dead leaves, or plants
Ammonia burn
Glyphosate herbicide injury
Hole in leaves
leaves skeletonized or window-like
western corn rootworm adult
leaves shredded
Hail injury
wind damage
Leaves eaten
insects
European corn borer
southwestern corn borer
stalk borer
grasshopper
Variegated cutworm
cutworm
armyworm
livestock or wildlife
