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Knee-High to Tasseling Derek And Matt (Plants discolored, white, yellow,…
Knee-High to Tasseling Derek And Matt
Plants malformed and discolored
Galls; silvery white then black
Smut
Stunting, red leaves, excessive silvering
Maize dwarf mosaic and corn stunt
Maize chlorotic mottle
Stunting, tillering, twitsting
Crazy top (disease)
Narrow leaves, striping
Sorghum downy mildew
Plants have abnormal shape or position
Stalks collapse from rot
European corn borer
2-4-D herbicide injury
Cutworm
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
Herbicide injury
2-4-D dicamba
Slugs
Plants discolored, white, yellow, or purple
Narrow leaves, striping
Sorghum downy mildew
Leaves completely white, or top leaves scattered leaves white
Extreme Heat
White stripes and some white leaves on scattered plants only
Genetic stripe
Yellowing of plants, beginning with lower leaves at leaf tip along midrib
Nitrogen deficiency
Standing water
Yellowing of leaf margins. beginning at tips; affected tissue later turns brown and dies
Potassium deficiency
Yellowing and necrosis of lower leaves beginning at leaf tip.
Herbicide Injury
Photosynthetic inhibiting herbicide(applied post-emergence)
Purpling or reddening of leaves, from tip backward; affects lower leaves initially; leaf tips may later turn dark brown and die
Phosphorus deficiency
Yellow to white interveinal striping on leaves or reddening of leaves
Magnesium Deficiency
Pale green to white striping on leaves
Iron deficiency
Upper leaves show pale green to yellow interveinal discoloration
Manganese deficiency
Lesions or necrotic spots on leaves
Yellow leaf blight
Paraquat
anthracnose
stewarts leaf blight
Helminthosporium leaf blights
Leaves have a window effect but neither surface is broken
Corn blotch leaf miner
Leafhopper eggs
Upper leaves brown and sticky
Corn leaf aphid
Yellow or dead leaves, or plants
Ammonia burn
Glyphosate herbicide injury
Holes in leaves
Leaves eaten
Livestock or wildlife
Leaves skeletonized or window-like
Western corn rootworm adult
Insects
European corn borer
Southwestern corn borer
Stalk borer
Grasshopper
Variegated cutworm
Cutworm
Armyworm
Leaves shredded
Hail injury
Wind damage
