From 1997 to 1999, Schizaphis graminum (Rondani), intensity (number per tiller) was estimated on 115 occasions from hard red winter wheat fields located throughout the major wheat growing regions of Oklahoma. A total of 32 and 83 fields was sampled during the fall and spring, respectively. The parameters of linear regressions relating the mean number of greenbugs per tiller (m) and the proporti...

We examined the effects of prescribed fire on white pine (Pinus strobus) advance regeneration in small experimental plots in mixed hardwood-pine forests in southwestern Virginia during the fall and spring. Fires killed all newly germinated seedlings in both spring and fall. Saplings (ranging from 0.7 3.4 m in height) all suffered some degree of crown scorch, but sapling survival was higher on p...

To explore the roles of plasticity and genetic variation in the response to spatial and temporal climate variation, we established a common garden consisting of paired collections of native and introduced riparian trees sampled along a latitudinal gradient. The garden in Fort Collins, Colorado (latitude 40.6°N), included 681 native plains cottonwood (Populus deltoides subsp. monilifera) and int...

Aspects of the reproductive biology of male and female Agkistrodon piscivorus are described using histological techniques, reviewed, and compared with historical data on A. piscivorus. These include anatomical description at the macro and microscopic levels, and correlation of the male and female urogenital cycles to the reproductive life history of A. piscivorus. New anatomical descriptions an...

Evolution of glyphosate-resistant kochia is a threat to no-till wheat-fallow and glyphosate-resistant (GR) cropping systems of the US Great Plains. The EPSPS (5-enol-pyruvylshikimate-3-phosphate synthase) gene amplification confers glyphosate resistance in the tested Kochia scoparia (L.) Schrad populations from Montana. Experiments were conducted in spring to fall 2014 (run 1) and summer 2014 t...

Like at most colleges and universities, a relatively small number of courses at Oakton account for a large percentage of student enrollments. In this In the Abstract, we present information about Oakton’s high enrollment courses and the characteristics of students enrolling in them. Data are from Fall 1998 through Spring 2003 semesters, excluding summers. First, what are the high enrollment cou...

The double-deficit hypothesis provides a framework for identifying students atrisk for persistent reading difficulties. I examined the temporal stability of four double-deficit subtypes (no-deficit, naming-speed deficit, phonological deficit, and double-deficit) in 197 low-performing, first-grade readers. Concurrent analyses in fall and spring revealed that students with poor phonemic awareness...