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Corn leaf aphids
The corn leaf aphid sucks sap from plants and deposits a sticky substance called "honeydew." The honeydew can become moldy, giving the tops of the plants a black, sooty appearance, interferes with plant photosynthesis.
The corn leaf aphid is a blue-green or gray, soft-bodied, spherical insect about the size of a pinhead (1.6 mm in length). It has approximately 9 generations per year. Female corn leaf aphids do not lay eggs, as do most other insects, but give birth to living young. These young, called nymphs, resemble the adults except that they are smaller and are sexually immature. Adults and nymphs can often be found clustered within the whorls or upper parts of corn plants over isolated or wide areas of a field.
Heavily infested corn leaves may wilt, curl, and show yellow patches of discoloration. When tassels and silks are covered with honeydew, the pollination process may be disrupted. Also, excessive aphid feeding within the whorl prior to tassel emergence appears to be directly related to incomplete kernel development and/or barren ears.
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