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R1 to R6 (Discolored or dead plants (Barren stalk, no ears, only stunted…
R1 to R6
Discolored or dead plants
Reddish or purple leaves and stalk
Genetic charaecter
Drought or other stress
Injury to leaf or stalk
Corn stunt
Maize dwarf mosaic or other virus
Stress by corn leaf aphids
Nematodes
Plant dies prematurely
Stalk rots
Severe corn borer damage or other stalk injury
Drought
Dead, frosted appearance off leaves
Foliar diseases
Helminthosporium leaf blights
Stewarts 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 aphids
Ear smut
Maize dwarf mosaic
Extreme heat prior to or during pollination
Nematodes
Damage to ear
Shucks eaten or open, kernels eaten or damaged
Grasshopprs
Birds
Rodents or other animals
Kernel's tunneled and eaten
Insect damage
Corn earworm
Corn borer
Picnic beetle
Corn sap beetle
Fall armyworm
Ends of ears eaten off
Deer, livestock
No silks apparent
Delayed silking or failure to silk
Population too high for hybrid
Drought stress
Low phosphorus supply
Nitrogen deficiency
Severe corn leaf ahpid
Silks eaten off
Insect damage
Corn rootworm adult
Grasshopper
Japanese beetle
Wollybear caterpillar
No pollen; tassels sterile
Improper kernel set
2-4D or dicamba applied at improper time
Genetic male sterility
Leaves torn or pieces missing
Large, irregular areas eaten in leaves
Insect damage
Grasshopper
Fall armyworm
