Digital Commons Network^™

Seasonal Population Fluctuations And Natural Control Of The Sweetclover Aphid, G. R. Manglitz, R. E. Hill

Nebraska Agricultural Experiment Station: Historical Research Bulletins

Because the potential of the sweetclover aphid for damaging sweetclover is well documented, yet damage occurs only occasionally under field conditions, it would appear that natural factors which depress midsummer populations are important in preventing greater damage and worthy of detailed study. Thus, this study was begun early in 1959 to investigate the natural factors which generally keep populations of this aphid below levels causing economic damage.

A Review Of The Mites Of The Family Pseudocheylidae Oudemans, 1909 (Acarina, Prostigmata), Edward W. Baker, Warren T. Atyeo

Bulletin of the University of Nebraska State Museum (1924–2023)

Four genera and ten species are included; these are: Pseudocheylus biscalattts Ber1ese, 1888, P. americanus (Ewing), 1909, Stigmocheylus brevisetus Berlese, 1910, Anoplocheylus europaeus (Berlese), 1910, A. clavatus, n. sp., A. aegypticus, n. sp., A. protea (Womersley), 1935, Neocheylus natalensis Tragardh, 1906, N. nidcolus Lawrence, 1954, and N. collis, n. sp.

The Nebraska Sandhill Lakes: Their Characteristics And Fisheries Management Problems, D. B. Mccarraher

Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts

A brief look at the map of Nebraska will readily point out the obvious fact that the sandhills comprise a considerable portion of the land area of the state. To be more precise, an area encompassing around 20,000 square miles or about one quarter of the total state area. This is indeed a vast prairie region long noted for its fine cattle and native hay crops. It is a region of vegetative dune sandhills, sandy basins and valleys, exposed ground water, spring seep lakes and marshes. Since much is already known concerning the land portion of the sandhills it is …

Studies On The Helminth Fauna Of Alaska. Xxxvi. Parasites Of The Wolverine, Gulo Gulo L., With Observations On The Biology Of Taenia Twitchelli Schwartz, 1924, Robert L. Rausch

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Natural biotic relationships already had been severely disrupted in the United States by the time significant interest had developed in faunistic helminthology. Some mammalian species, particularly the larger carnivores, had been extirpated or were represented only by scattered individuals in the few remaining wilderness areas. Thus, it is not remarkable that the helminths of such species as the wolverine, Gulo gulo Linnaeus, have been little studied. Fortunately, however, much of arctic and subarctic North America has endured in its primitive state, and here it is still possible to undertake basic biological studies under undisturbed conditions.

Biological Indices Of Water Pollution, With Special Reference To Fish Populations, Peter Doudoroff, Charles E. Warren

Other Publications in Wildlife Management

A number of investigators have very recently published discussions having to do with biological indices and biological measures of water pollution (1) (2) (7) (13) (14) (15) (16) (26) (27) (28) (29) (30) (36) (38). Fjerdingstad (12) has discussed some of the pertinent European literature. The fundamental concepts presented by these authors are not original, for the idea that aquatic organisms can be useful "indicators" of environmental conditions, and particularly of the degree of pollution of water with organic wastes, has a long history (12). Because of certain novel features and the relatively wide scope of the studies, and the …

Stream Pollution- Aquatic Macro-Invertebrate Communities As Indicators Of Organic Pollution In Lytle Creek, Arden R. Gaufin, Clarence M. Tarzwell

United States Environmental Protection Agency: Publications

Year-round field studies of the com position and ecology of stream communities associated with the purification of organic wastes in streams were initiated on Lytle Creek in October, 1949. This creek, which is located about 45 miles northeast of Cincinnati, Ohio, is a tributary of the Little Miami River. Its drainage basin comprises 27 sq. mi., a third of which is contained within the city limits of Wilmington, Ohio, a city of some 7,412 persons

Neascus Nolfi N. Sp. (Trematoda: Strigeida) From Cyprinid Minnows With Notes On The Artificial Digest Recovery Of Helminths, Glenn L. Hoffman

United States Fish and Wildlife Service: Publications

During an examination of fish from Turtle River, Arvilta, North Dakota, a new Neascus (larval strigeid) was recovered from the musculature and integument of the northern creek chub, Semotilus a. atromaculatus (Mitchell) and the northern common shiner, Notropis cornutus frontalis (Agassiz). This new species is named in honor of Dr. L. O. NoIf, University of Iowa.

Secretion Of Amylase By Rumex Virus Tumors In Vitro, L. G. Nickell, M. K. Brakke

Department of Plant Pathology: Faculty Publications

The secretion of extracellular enzymes by intact cells of higher plants apparently is a rare occurrence. One example of it is the secretion of an extra, cellular amylase by the tissue of a virus-induced tumor from the root of Rumex wetosa L. An amylase is secreted in sufficient quantities by this tissue to enable it to grow as well in vitro on a starch-containing medium as on one containing sucrose.

Influence Of Food Plants On Fecundity, Larval Development And Abundance Of The Tuber Flea Beetle In Nebraska, Roscoe E. Hill

Nebraska Agricultural Experiment Station: Historical Research Bulletins

Laboratory and field tests were conducted to determine the effects of different food plants on fecundity, adult longevity and larval development of the tuber flea beetle, Epitrix tuberis Gentner. All food plants tested were those upon which the overwintered beetles commonly feed in the spring following emergence from hibernation.

Research Bulletin 143, Influence Of Food Plants On Fecundity, Larval Development And Abundance Of The Tuber Flea Beetle In Nebraska, 1946

University of Nebraska Historical Extension: Bulletin

Research Bulletin 143, Influence of Food Plants on Fecundity, Larval Development and Abundance of the Tuber Flea Beetle in Nebraska, 1946

57th Annual Report Of The Agricultural Experiment Station May 1944, W.W. Burr

Agricultural Research Division: News and Annual Reports

Contents

Introduction ............. 3

Soils Research ............. 5

Field Crops Research ............. 12

Horticultural Crops ............. 34

Plant Diseases ............. 43

Chemical Studies with Plant Materials ............. 48

Insects and Rodents ............. 52

Feeding Cattle, Hogs and Sheep ............. 61

Dairy Production and Manufacture ............. 72

Poultry Nutrition and Management ............. 78

Animal Diseases ............. 82

Agricultur al Engineering ............. 84

Rural Economics ............. 88

Home Economics ............. 93

Box Butte Experiment Farm ............. 99

North Platte Substation ............. 100

Scotts Bluff Substation ............. 103

Valentine Substation ............. 109

Experiment Station Publications During 1943............. 111

Experiment Station Administration and Staff …

Arterial Anomalies Pertaining To The Aortic Arches And The Branches Arising From Them, Charles William Mccorkle Poynter

University Studies (University of Nebraska) (1888–1984)

For a number of years I have been interested in the arterial variations which have been encountered in my dissecting rooms. Notes have been made of these abnormalities and the literature describing similar conditions has been gradually collected. The more recent textbooks in anatomy devote little space to the subject of arterial variations and the classic works which have reviewed the field are no longer readily consulted; then, too, new facts have been added to our knowledge of arterial development since the most recent of the latter were published. In view of these facts it has seemed worth while to …

Review Of The Phytogeography Of Nebraska. 1. General Survey, By Roscoe Pound, Elizabeth Britton

School of Biological Sciences: Faculty Publications

From the preface we learn that this work is the result of nearly five years of active study of the floral covering of Nebraska, carried on by the members of the Botanical Seminar in the Botanical Survey of the State. The systematic study of the vegetation of Nebraska was begun by Dr. Bessey in 1884, and has since been carried on by him and his students, all previous collecting having been more or less desultory and unreliable. The Botanical Survey was organized in 1892, and its work has been directed to the collecting of specimens and observations for a series …

The Phytogeography Of Nebraska, Roscoe Pound, Frederic E. Clements

Papers in Systematics and Biological Diversity

From the preface we learn that this work is the result of nearly five years of active study of the floral covering of Nebraska, carried on by the members of the Botanical Seminar in the Botanical Survey of the State of Nebraska. The systematic study of the vegetation of Nebraska was begun by Dr. Bessey in 1884, and has since been carried on by him and his students, all previous collecting having been more or less desultory and unreliable. The Botanical Survey was organized in 1892, and its work has been directed to the collecting of specimens and observations for …

Zoology In The High School Curriculum, Henry B. Ward

Studies from the University of Nebraska Zoological Laboratory

A long time has elapsed since Bacon gave to the world the sound advice that “ we should accustom ourselves to things themselves.” Little by little this idea has gained ground, until now it is recognized as a general principle in every grade of educational work and in widely separated departments of study that contact with concrete objects is far more inspiring and thought-producing than the mere scanning of black marks on a white page. So far as natural science is concerned, the varied training which it affords has been abundantly discussed before this association and elsewhere. To be sure, …

A Biological Examination Of Lake Michigan In The Traverse Bay Region, Henry B. Ward

Studies from the University of Nebraska Zoological Laboratory

During the summer of 1893 the Michigan Fish Commission entered upon a biological study of the Great Lakes by maintaining a party on Lake St. Clair. In the report of that two months, written by the director of the laboratory, Professor J. E. Reighard, are given in full the reasons which led to the inception of the undertaking and the aims which its promoters held in view. A study of the life of the lake in all its manifold interrelations and especially of those factors which bore upon the welfare of the food fishes in general and the young whitefish …