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Expansion of the Range of the Cereal Leaf Beetle, Oulema melanopus (L.) (Coleoptera: Chrysomelidae), in Missouri and Iowa

Wayne C. Bailey, Carl E. Carlson, Benjamin Puttler and Charles R. Stoltenow
Journal of the Kansas Entomological Society
Vol. 64, No. 4 (Oct., 1991), pp. 455-457
Stable URL: http://www.jstor.org/stable/25085315
Page Count: 3
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Expansion of the Range of the Cereal Leaf Beetle, Oulema melanopus (L.) (Coleoptera: Chrysomelidae), in Missouri and Iowa
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Abstract

During 1989, the European Chrysomelid, Oulema melanopus (L.), was recovered from 22 of 37 (59%) counties surveyed in eastern Missouri and from 31 of 37 (84%) counties surveyed in eastern Iowa. Westward expansion of this pest continued in 1990 with Missouri and Iowa each reporting 13 additional "new county" records. Infestations were first reported in three counties near St. Louis, MO in 1972 and in four northeastern counties of Iowa in 1987. Soft red winter wheat is the dominant host plant of O. melanopus in Missouri whereas spring oats serve as the dominant host in Iowa. The westward expansion of the range of O. melanopus may be due to substantial increases in small grain acreage, lands enrolled in the Conservation Reserve Program, and/or changes in tillage and production systems. Although no parasitoids of O. melanopus were found in Missouri collections, the larval parasite, Tetrastichus julis (Walker), was present in collections from Allamakee and Fayette counties in Iowa.

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