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R1 to R6 Katelin and April (Discolored or dead plants (Barren stalk, no…
R1 to R6
Katelin and April
No Silk apparent
Delayed silking or failure to silk
Low phosphorus supply
Nitrogen deficiency
Drought stress
Severe corn leaf aphid
Population too high for hybrid
Silks eaten off
Insect damage
Grasshopper
Japanese beetle
Corn rootworm adult
Wollybear caterpillar
No pollen; tassels sterile
Improper kernel set
2,4-D or Dicamba applied at improper time
Genetic male sterility
Leaves torn or pieces missing
Large, irregular areas eaten in leaves
Insect damage
Fall armyworm
Grasshopper
Damage to Ear
Kernels tunneled and eaten
Insect damage
Picnic beetle
Corn sap beetle
Corn borer
Fall armyworm
Corn Earworm
End of ears eaten off
Deer, Livestock
Shucks eaten or open, kernels eaten or damaged
Birds
Rodents or other animals
Grasshoppers
Discolored or dead plants
Dead, frosted appearance of leaves
Foliar disease
Helminthosporium leaf blights
Stewart's leaf blight
Anthracnose
Frost
Barren stalk, no ears, only stunted nubbins or scattered kernels
Population too high for hybrid or season
Low fertility, especially nitrogen
Drought
Corn leaf aphid
Ear Smut
Maize dwarf mosaic, other viruses
Extreme heat prior to or during pollination
Nematodes
Plants die prematurely
Severe corn borer damage or other stalk injury
Drought
Stalk Rot
Reddish or purple leaves and stalk
Corn stunt
Maize dwarf mosaic or other virus
Injury to leaf or stalk
Stress by corn leaf aphids
Drought or other stress-see barren stalks
Nematodes
Genetic Character
