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G84-702 Root And Soil Analayses For Nematodes In Corn, David S. Wysong, Eric D. Kerr

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide describes how to interpret laboratory results of samples submitted for nematode analysis and discusses ten species that are potentially damaging to corn.

Several kinds of plant parasitic nematodes (small, soil-inhabiting roundworms) are associated with root injury, poor plant color, stunted growth, and reduced grain yields in field corn. Symptoms caused by these pests are often confused with root rot diseases, nutritional deficiencies or climatic stresses. Special laboratory analyses are, therefore, necessary to determine if nematodes are the primary cause of reduced corn performance. Since corn growers may be unfamiliar with nematode diseases, the following discussion of laboratory reports …

Pollution Of Surface Irrigation Waters By Plant Pathogenic Organisms, James R. Steadman, C. R. Maier, H. F. Schwartz, E. D. Kerr

Department of Plant Pathology: Faculty Publications

Systematic sampling of waterways and irrigation runoff from agricultural lands in the North Platte Project of Nebraska in July and August of 1972–1974 demonstrated that phytopathogenic organisms were disseminated. The organisms monitored included the bean common blight bacterium Xanthomonas phaseoli, the bean white mold fungus Whetzelinia sclerotiorum and various nematodes. Although many types of nematodes often were recovered from irrigation water, Heterodera sp. cysts which cause significant disease problems in the valley were found infrequently. Patterns of movement of the bacterial and fungal organisms were correlated with previous or current season infection of bean plants. The short-term survival of X. …

A Revision Of The Nematodes Of The Leidy Collection, Arthur C. Walton

Harold W. Manter Laboratory: Library Materials

Through the courtesy of Dr. Henry Baldwin Ward of the University of Illinois, and of Dr. J. Percy Moore of the University of Pennsylvania, the extensive nematode collection assembled by the late Joseph Leidy, and now housed in the museum of the University of Pennsylvania, has been made available for critical study and the present report is the first of a series covering this material. The writer wishes to express his hearty appreciation of the kindness of these two men, and also of that of Dr. Joseph Leidy, Jr., in making this opportunity possible. To make the study more complete …

Fusarium Blight Of The Soy Bean And The Relation Of Various Factors To Infection, Richard O. Cromwell

Historical Research Bulletins of the Nebraska Agricultural Experiment Station

An investigation was outlined (1) to determine the parasitism of Fusarium on soy bean, (2) to establish its relationship to Fusaria of the section Elegans in so far as a comparison of the cultural characters permitted, and (3) by means of cross- inoculations and field studies to determine the relationship of this disease of soy beans to the wilt disease of cowpeas (Vigna sinensis Hassk.) caused by Fusarium tracheiphilum Smith. The results of these investigations up to the close of the summer of 1916 have been reported. The studies were continued at the North Carolina Experiment Station until the …

On The Structure And Classification Of North American Parasitic Worms, Henry Baldwin Ward

Harold W. Manter Laboratory: Library Materials

For many years I have been engaged in the study of parasitic worms from North American freshwater hosts, mostly fish; during this time I have had opportunity to examine and compare material from a large number of localities embracing many widely separated points. In this work I have been aided very greatly by studies on individual groups undertaken and published under my direction by various graduate students to whom my obligation is freely expressed here. In connection with this work it has been necessary to examine critically all original records of parasites from similar hosts and to endeavor to reach …

Notes On Some Nematodes From Fresh-Water Fishes, Henry Baldwin Ward, Thomas B. Magath

Harold W. Manter Laboratory: Library Materials

The parasitic nematodes are of conspicuous importance in the field of human disease and also in diseases of the domestic animals, and in his treatise on fish diseases, Hofer (1906), discussing the significance in fish culture of parasites and parasitic disease5, states that among them the nematodes outrank all others in number of types. Yet as fish parasites these forms are almost unknown in North America, and references to them are confined to a few brief notes, almost all of which came from the pen of the distinguished Philadelphia microscopist, anatomist, and parasitologist, Joseph Leidy, whose pioneer work published between …

Rhabditin, Nathan Augustus Cobb

Harold W. Manter Laboratory: Library Materials

Excerpt:

Rhabditin is the term applied by the writer to an organic substance, the type form of which is found crystallized in brilliantly doubly refractive spheres arranged in a definite way in the cells of the intestine. Rhabditis monhystera Bütschli, and other nematodes, in whose metabolism it plays an important role.

Rhabditin crystallizes under the life influences of Rhabditis monhystera into spheres, about 1 to 3 microns in diameter, which are rather slowly soluble in water, rapidly so in alkalies and acids—in the latter without effervescence—and are insoluble or but very slowly soluble in alcohol, glycerin, xylol and oils. The …

Variation In Oxyurias: Its Bearing On The Value Of A Nematode Formula, Stanley B. Fracker

Harold W. Manter Laboratory: Library Materials

Excerpt:

One of the most difficult problems in zoologic science is the classification of round worms. Authors and lecturers, after a carefully outlined and definitely arranged discussion of trematodes and cestodes, are compelled to consider nematodes in a somewhat desultory and inaccurate fashion. Two reasons for this may be given, the greater being the apparent lack of a basis for determining the phylogeny of the major groups, a condition with which we are not at present concerned. The other obstacle is the difficulty of differentiating between species and uncertainty as to the value of different kinds of taxonomic characters. The …

Contributions To A Science Of Nematology, Nathan Augustus Cobb

Harold W. Manter Laboratory of Parasitology: Faculty and Staff Publications

Contents

I. Antarctic Marine Free-Living Nematodes of the Shackleton Expedition.

II. North American Free-Living Fresh-Water Nematodes.

III. The Asymmetry of the Nematode Bunonema inequale, n. sp.

IV. Selachinema, a New Nematode Genus with Remarkable Mandibles.

V. Notes on Nemas.

VI. The Mononchs, a Genus of Free-Living Predatory Nematodes.

VII. Filter-Bed Nemas: Nematodes of the Slow Sand Filter-Beds of American Cities.

VIII. The Orders and Classes of Nemas.

IX. One Hundred New Nemas (Type Species of 100 New Genera).

X. Howardula benigna, a Nemic Parasite Cucumber-Beetle.

XI. Marionella.

XII. Greeffiella.

XIII. An Amendation of Hoplolaimus …

A Nematode Formula, Nathan Augustus Cobb

Harold W. Manter Laboratory of Parasitology: Faculty and Staff Publications

I hope by the aid of this new formula to be able to describe, even without the aid of figures, at least such species as belong to already well known genera, so accurately as to leave little to be desired, and yet so briefly as to leave space for the full discussion of the important relations existing between these worms and diseases of plants.