The Chrysobothris femorata (Olivier, 1790) species group is currently comprised of five species from North American localities north of Mexico. One previously described and synonymized species, C. quadriimpressa Gory & Laporte, 1837 is resurrected. In addition, neotypes are designated for C. femorata, C. rugosiceps Melsheimer, 1845 and C. viridiceps Melsheimer, 1845 as the type specimen for each of these species is lost. A key is included to facilitate identification of the 12 species, 11 of which have deciduous trees as hosts and one species from woody goldenrod, Chrysoma pauciflosculosa (Michx.). Six new species of Chrysobothris are described herein: C. mescalero, C. seminole, C. wintu, C. comanche, C. caddo, and C. shawnee. The new species are each fully described and the elytra, male genitalia, and female pygidium (8th abdominal tergite) of all species are illustrated.
Cereal leaf beetles (CLB), Oulema melanopus (L.), oviposited more eggs on ‘Downy’ winter wheat, Triticum aestivum L., than expected based on its previous classification as very resistant to the CLB. Within a field of Downy, beetles oviposited on those leaves with fewer and shorter trichomes. The trichome profile (length and density) of all leaves were determined for Downy grown in southwestern Michigan. Trichome profiles differed significantly between years for the same leaf number and between different leaves the same year. The flag leaf was not as resistant as the three leaves below it. The overall trichome profile was best estimated by samples from the mid‐region of the leaf. Trichome density of the seedling first leaf was positively correlated with leaf length and negatively correlated with soil moisture in laboratory studies. Trichome profiles of the first seedling leaf were positively correlated with temperature. Downy grown in the field in 1979 was rated between susceptible and moderately resistant (depending upon which leaf was rated).
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