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Samolus Parviflorus Raf., Norman Tracy

Specimens by Name

No abstract provided.

Factors Influencing Production Of Flower Stalks In Agropyron Cristatum (L.) Gaertn, Neil C. Frischknecht

Theses and Dissertations

A study was made of factors that influence production of different numbers of flower stalks of crested wheatgrass on grazed and ungrazed areas. Both laboratory and field studies were made. Greatest response in flower stalk production resulted from application of nitrogen in the field, amounting to an increase of from 5 to 10 times the numbers of flower stalks on untreated areas. Responses of plants in the greenhouse supported these results. Plants grown in the dark indicated that higher carbohydrate reserves existed in ungrazed than in grazed plants. It was concluded that a high carbohydrate-low nitrogen balance was the primary …

Vegetational Changes In A Mountain Brush Community Of Utah During Eighteen Years, Robert J. Eastmond

Theses and Dissertations

This vegetational analysis is concerned with changes which have cocurred since 1949 in a mountain brush community within an exclosure in the central Wasatch Mountains. The exclosure, established in 1949, is located in Pole Canyon on lower Provo Canyon. Two major studies have been conducted previously, but it has been nine years since the last intensive work was done. Several major changes occurring during the eighteen year period are evident and are described.

Field Observations And Laboratory Studies On Growth And Tillering In Seedlings Of Oryzopsis Hymenoides As Affected By Selected Environmental Factors Of The Sand Dunes Of Lynndyl, Utah, Leopold B. Smigelski

Theses and Dissertations

Seedlings of Indian rice grass Oryzopsis hvmenoides (Roem. & Shult.) Ricker. were studied to determine the effect of soil moisture, photoperiod, depth of burial of germinated grains, temperature, and the rate of soil accumulation on seedling growth and tillering. The study was performed in two phases: Field observations and laboratory studies. Field observations were made on a system of sand dunes located northwest of Lynndyl, Utah. General observations were made from January, 1966 to May, 1968.

Housing Burley Tobacco On Portable Curing Frames, Elmon E. Yoder, Ira E. Massie

Agronomy Notes

Portable frames, wood and steel, and tractor lifts will make tobacco housing a little easier. The following story describes the use of these items in housing a burley tobacco crop.

Flavonoid Chemotaxonomy Of Cacalia (Compositae), Paul Ernest Goldenbaum

Masters Theses

No abstract provided.

Thrips Of The Sagebrush-Grass Range Community In West-Central Utah, Ward Max Tingey

Theses and Dissertations

Three predominant and economically important shrubs of the sagebrush-grass range community in Utah, namely big sagebrush (Artemisia tridentata Nutt.), rubber rabbitbrush (Chrysothamnus nauseosus (Pall.) Britt.), antelope bitterbrush (Purshia tridentata (Pursh) DC), and a widely re-seeded range grass, crested wheatgrass (Agropyron cristatum (L.) Gaertn.) were sampled during the summers of 1966 and 1967, and yielded twenty species of thrips. Three species (Anaphothrips tricolor Moulton, Chirothrips aculeatus Bagnall, Chirothrips simplex Hood) were new distributional records for Utah. Seven species (Frankliniella n. sp. #1, Frankliniella n. sp. #2, Haplothrips n. sp., Leptothrips n. sp., Oedaleothrips n. sp., Sericothrips n. sp. #1, Sericothrips n. …

A Study Of Multiple Embryo Development In The Netleaf Hackberry (Celtis Reticulata), Gary Porter Lawrence

Theses and Dissertations

Previous research has shown that polyembryony occurs in many species of the Ulmaceae. The purpose of this study was to determine the method of multiple embryo formation in netleaf hackberry, Celtis reticulata Torr. Collections of specimens were made throughout a two-year period. Collections were begun in early spring while the trees were still in the bud state. Collections were continued regularly throughout the growing season. The collections were preserved in FAA solution and were prepared for microscopic examination as follows: (1) The tertiary butyl paraffin method was used for dehydrating and embedding. (2) Sectioning was done on a rotary microtome …

A Water-Soluble Factor In Melilotus Officinalis Leaves Which Stimulates Feeding By The Adult Sweetclover Weevil, W. R. Akeson, Herman J. Gorz, Francis A. Haskins, G. R. Manglitz

Department of Agronomy and Horticulture: Faculty Publications

Akeson et al. (1967) reported that the water-methanol phase of a water-methanol-chloroform extract, obtained from leaves of Melilotus officinalis L. Lam. (variety Goldtop), stimulated extensive feeding by the sweetclover weevil, Sitona cylindricollis (Fähreus), on bioassay disks prepared from sweetclover roots. Subsequent studies have shown that a hot-water extract will elicit a similar response. When disks were treated only with the solvent used in extraction, an almost negligible amount of feeding was obtained. Thus, leaves of Goldtop sweetclover apparently contain one or more water-soluble feeding stimulants. Beck (1965) defined a feeding stimulant as a a stimulus tending to promote continuous feeding. …

Vitis Cinerea Noronha, John E. Ebinger

Specimens by Name

No abstract provided.

Floral Induction In Some Members Of The Umbelliferae In Response To Cold Treatment, Photoperiod, Gibberelic Acid, And Kinetin, A: Glenn Wahlquist

Theses and Dissertations

This study was undertaken to determine the influence of different treatments of temperature, photoperiod, gibberellic acid, and kinetin on the flowering responses of certain biennial species of the Umbelliferae. Seven species were selected for study, namely: carrots, wild carrots, parsnips, wild parsnips, poison hemlock, celery, and parsley.

The Uptake Of Calcium By Iso Lines And Kentucky Varieties Of Nicotiana Tabacum L., Francis J. Shay

Morehead State Theses and Dissertations

A thesis presented to the faculty of the School of Sciences and Mathematics at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Biology by Francis J. Shay on July 18, 1968.

Broussonetia Papyrifera Vent., John E. Ebinger

Specimens by Name

No abstract provided.

Vitis Riparia Michx., John E. Ebinger

Specimens by Name

No abstract provided.

Hottonia Inflata Elliot, R. Dale Thomas, Joan Hutto

Specimens by Name

No abstract provided.

Lysimachia Lanceolata Walter, G. A. Hellinga

Specimens by Name

No abstract provided.

Management Practices To Reduce Losses Caused By Hail Damage To Burley Tobacco, Allen Wallace, George Byers, Terry Rock

Agronomy Notes

It is estimated that Kentucky farmers have suffered income losses caused by hail damage to burley tobacco in excess of $6 million annually over the last five years . Such losses could often be substantially reduced through proper management of the crop following hail, according to studies involving artificial and natural hail damage.

Ticks Of The National Reactor Testing Station, Dorald M. Allred

Brigham Young University Science Bulletin, Biological Series

During the period from June, 1966, to September, 1967, 27 amphibians of two species, 446 reptiles of eight species, 561 birds of 81 species, and 4050 mammals of 26 species were examined for ectoparasites at the National Reactor Testing Station in southern Idaho. Of seven species of ticks collected, the predominant one was Ixodes kingi, found on mammals of 12 species. Next in abundance was Dermacentor andersoni found on birds of three species and mammals of 16 species. Haemaphysalis leporispalustris was taken from birds of 10 species and six spvecies of mammals. Four other species of Ixodes were taken from …

Osteology And Myology Of Phrynosoma P. Platyrhinos Girard And Phrynosoma D. Hernandesi Girard, Richard L. Jenkins, Wilmer W. Tanner

Brigham Young University Science Bulletin, Biological Series

This study confirms the work of Etheridge (1964) in suggesting the peculiarity of the genus Phrynosoma within the family Iguanidae. The anterior osteology and myology of Phrynosoma platyrhinos platyrhinos Girard and Phrynosoma douglassi hernandesi Girard indicate Phrynosoma to be highly specialized and to differ significantlv from the Iguanid structure as portrayed by Oelrich (1956), Robison and Tanner (1962), and Avery and Tanner (1964). They also differ because of: ( 1 ) absence of lacrimal and postfrontal bones; (2) occurrence of occipital (also mandibular and temporal) spines; (3) posterodorsal shift of the skull elements; (4) divided nature of the M. sternohyoideus, …

Front Matter, Vol. 9 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 10 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 9 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 10 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Vitis Riparia Michx., John E. Ebinger

Specimens by Name

No abstract provided.

Notes On The Fern Family Matoniaceae From The Western United States, Samuel R. Rushforth

Theses and Dissertations

A Cretaceous fern flora haas been recently discovered near Westwater, Grand County, Utah. Among specimens collected from Westwater are many forms related to extant members of the fern family Matoniaceae. This family was widely distributed geographically throughout most of the Mesozoic Era, and matoniaceous ferns have been collected from several fossil localities in the United States. The Matoniaceae was especially important in the United States during Lower Cretaceous times. Five species, Matonidium brownii Rushforth, Matonidium lanceopennis Rushforth, Matonidium galleyi (Miner) Rushforth, Matonidium americanum Berry em. Rushforth, and Matonidium sp., and one variety, Matonidium brownii var. extenda Rushforth, are considered in …

Viola Pubescens Aiton, L. Kloker

Specimens by Name

No abstract provided.

Viola Pratincola Greene, Richard W. Crites

Specimens by Name

No abstract provided.

Chemical Weed Control In Tobacco Fields, James W. Herron

Agronomy Notes

Enide 50W and Vernam 6E are the two herbicides recommended in 1968 for weed control in tobacco fields.

Isolation And Partial Characterization Of The Toxic Substance From Eremocarpus Setigerus Benth, Shuliang Lee

Loma Linda University Electronic Theses, Dissertations & Projects

The work on the active substance of Eremocarpus setigerus Benth has been previously performed by Naito and Noller. However, the investigation was not complete. Therefore we isolated and tested this substance by steam distillation and thin layer chromatography technique. A yellow sticky toxic substance was isolated with Rf values of 0.15 in benzene system and 0.57 in benzene-absolute ethanol (95:5 v/v) system.

The toxic substance which is free of halogen, nitrogen, and sulfur, is soluble in ethyl ether, ethanol, and concentrated sulfuric acid. It has a maximum absorption in the ultraviolet region that indicates the presence of unsaturation. Its infrared …

A Study On The Effectiveness Of Precipitation In The Salt Desert Shrub Type, Sam Finley Brewster

Theses and Dissertations

The purpose of this study was to measure quantitatively the effectiveness of precipitation by determining the amount and timing (i.e. distribution-in-time) of plant absorption of moisture during the summers of 1965 and 1966. In addition the effectiveness of precipitation was related to some causal factors, especially those factors which help provide a procedure for calculation of this effectiveness.