cereal leaf beetle

noun
an Old World leaf beetle, Oulema melanopus, introduced into North America in 1962: a serious pest of small grains, especially oats and cereal grasses.

Origin:
1960–65

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Example sentences
The feeding damage by cereal leaf beetle was determined on the flag leaf as a
  percentage of the whole surface.
Cereal leaf beetle populations were large, but damage was difficult to
  determine.
Cereal leaf beetle infestations were heavier than last year's and required
  control in some locations.
Cereal leaf beetle and alfalfa weevil problems appear to have run their course.
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