Myochrous denticollis
(Say, 1824)
Southern Corn Leaf Beetle
A small leaf beetle in the Chrysomelidae, measuring approximately 3/16 inch (about 4.8 mm) long. are dark brown and often soil-covered, with three distinct teeth on each lateral edge of the that give the its name. It is a documented agricultural pest of corn, particularly in Illinois, and has been reported from Central America and North America.
Pronunciation
How to pronounce Myochrous denticollis: /maɪˈɒkrəs dɛntɪˈkɒlɪs/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
The is distinguished by three prominent teeth on each lateral margin of the pronotum (), the feature referenced in its specific epithet "denticollis" (Latin for "toothed-collar"). are approximately 3/16 inch long and about one-third as wide, with a dark brown coloration. The body is often covered with soil particles, which can obscure the underlying coloration.
Images
Habitat
Agricultural areas with corn ; overwinter beneath soil and plant debris and in clumps of certain weed .
Distribution
Recorded from Central America and North America; specific records include Illinois (United States) and Québec (Canada).
Seasonality
emerge in early spring after ; active period coincides with young weed growth and early-planted corn.
Diet
feed on young corn plants and weed including cocklebur, smartweed, and crabgrass.
Life Cycle
Overwinters as beneath soil and plant debris; emerges in early spring to resume feeding.
Behavior
exhibit a drop-and-hide response when disturbed, falling from food plants to the ground to conceal themselves. This makes detection difficult in the field.
Human Relevance
Documented crop pest causing damage to corn in Illinois; economic impact appears localized rather than widespread.