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New Records And Species Of Neotropical Bark Beetles (Scolytidae: Coleoptera), Stephen L. Wood

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 10 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 10 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 10 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 10 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Study Of The Weevil Tribe Celeuthetini Of The Solomon Islands (Coleoptera: Curculionidae), Vasco M. Tanner

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Contamination In Denta Sweetclover During Successive Generations Of Seed Increase, H. J. Gorz, Francis A. Haskins

Department of Agronomy and Horticulture: Faculty Publications

Contamination levels observed in the breeder, foundation, and certified seed generations of 'Denta' sweetdover (Melilotus alba Desr.) were 0.71, 1.69, and 3.62%, respectively, as measured by the frequency of plants high in content of o-hydroxycinnamic acid. Based on a sample of plants tested simultaneously for o-hydroxycinnamic acid content and ,β-glucosidase activity, a small but consistent decrease in the frequency of cu plants occurred with succeeding seed generations, while shifts in the frequency of b plants were not consistent in magnitude or direction. Contamination through cross-pollination with CuCuBB plants may be the major factor responsible for the observed decreases in …

A Revision Of Cryptantha Subgenus Oreocarya, Larry Charles Higgins

Theses and Dissertations

This study is a taxonomic revision of Cryptantha subgenus Oreocarya (Boraginaceae), together with descriptions of species, synonyms, distribution maps, and discussions. The present treatment recognizes fifty-seven species and fourteen varieties, all separated by means of a comprehensive key. A history of the group, along with a discussion of the distribution, ecology, and phylogeny is presented. As a basis for the comparison of taxa much of the research has been concentrated on morphological variation in herbarium specimens. Particular attention has been directed to a study of pubescence types, branching patterns, flowers, calyces, and the fruit. The herbarium research has been correlated …

A Study Of Aquatic Fungi In Powell's Slough, Chao-Chih Hsiao

Theses and Dissertations

Aquatic fungi in-Powell's Slough were.studied in 1967 & 1968. Collections were made and water temperature, oxygen content & pH values were measured at weekly intervals. For collections, wire baskets containing substrata were submerged in water for one month. After collecting, substrata were brought to the laboratory. Identification was based on the keys of Sparrow, 1960. Aquatic fungi identified included seven orders, nine families, fifteen genera, and thirty species, from thirty-three collections of fifteen types of substrata. The substrata used in this study were: (i) fruits: apples, rose hips, plums, pears, haws; (ii) twigs: poplar, weeping willow, river birch, weeping white …

A Revision Of The Hedysarum Boreale Complex, Terry Edwin Northstrom

Theses and Dissertations

The Hedysarum boreale complex consists of all North American Members of the genus Hedysarum which possess free wing auricles, sub-equal calyx teeth, hidden leaflet veins, and wingless loment articles. One species, two subspecies, and three varieties are recognized. The traditional methods of comparative morphology are employed in delimiting species in the herbarium, but pertinent data from field work are also included. The somatic chromosome number was determined for all taxa, and was found in all cases to be 16. Distribution maps, illustrations, and graphical comparisons of taxa are included.

Some Parent-Progeny Relationships In Agropyron Elongatum, Max W. Turley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Twenty selected Agropyron elongatum clones were evaluated in parent and progeny nurseries with each clone represented by 560 progenies. Agronomic characters evaluated on the progenies included degree of erectness, three height measurements, and green weight data. Correlations were calculated between the seed yields of the progenies and the forage yield of the parents. General combining ability was determined for the 20 clones.

The clonal source of variation for erectness was high. More variation existed within clones for green weight than for any other character studied. Two specific clones exhibited better over-all general combining ability than the others. Successive seed yields …

Nutritive Values Of Russian Wildrye, Crested Wheatgrass, And Intermediate Wheatgrass Grazed By Cattle On Utah Foothill Ranges, George W. Mitchell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A comparative index to digestible nutrients was established for Russian wildrye, crested wheatgrass, and intermediate wheatgrass seeded on foothill areas of Utah. The nutritive values of these grasses were compared by the lignin ratio method, the chlorophyllan ratio method, and the in vivo rumen bag process.

Average digestion coefficients computed by the lignin ratio method for dry matter, ether extract, cellulose, and gross energy were highest for intermediate wheatgrass. Protein was more digestible for Russian wildrye. Digestible energy was adequate in all species to meet requirements for late lactation.

Results from the chlorophyllan ratio method were excessively high and were …

Quantitative Evaluation Of Saponin Content In Du Puits Alfalfa Foliage (Medicago Sativa L.) With Trichoderma, Wang Li-Chun

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Selections in Du Puits alfalfa (Medicago sativa L. ) were evaluated for saponin content. The data obtained from the Trichoderma bioassay were converted to saponin values by regressions and standard curves. It was necessary to adjust the concentration of alfalfa extract in the bioassay so that the saponin content in alfalfa was estimated in that portion of the curve showing a marked response to saponin. A different regression was established for each group of low and high saponin plants of Du Puits alfalfa. The standard curve prepared with extract of Du Puits alfalfa used on the basis of its …

Improvements In The Biological Assay Of Tobacco Mosaic Virus, Calvin Ray Lamborn

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Bean plants which were most susceptible to tobacco mosaic virus (TMV) were selected from more than 1,000 plant introductions. Thirty-eight percent of the lines tested developed local lesions, an indication of susceptibility to TMV. Six percent were better local lesion hosts than the commonly used bean variety (Pinto). Some lines were nine times more susceptible than the variety Pinto. Selections from P. I. 164353, 165455, 273673, 227379 and 223006 appeared to be the best local lesion hosts. A selection from P. I. 223006 produced lesions which were larger, lighter in color and slower developing than those of any other line …

The Alkaloids Of Delphinium Occidentale S. Wats., Lester B. Kreps

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Total and individual alkaloids were determined for duncecap larkspur from emergence through seed production. Total alkaloids were determined by a titration method. Individual alkaloids were separated by thin-layer chromatography and determinations made by cochromatography.

Total alkaloid concentration was highest during early vegetative growth then decreased steadily throughout the season. Decrease in total alkaloids was specific for a certain plant part. Total alakloids in stems and petioles declined more rapidly in the spring than did alkaloids in the apexes and leaves. Seasonal decline of total alkaloid was not noted in the crowns and roots; alkaloid concentration remained constant throughout the year …

Gas Chromatographic Determination Of Changes In Concentration Of Pipecolic Acid And Other Free Amino Acids In Hypersensitive Tobacco Plants Induced By Tobacco Mosaic Virus And Temperature, David Francis Brown

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Changes in concentrations of pipecolic acid and other free amino acids in Nicotiana tabacum, L. cv. Xanthi induced by tobacco mosaic virus (TMV) incubated at 75 or 95 F after inoculation were investigated gas chromatographically. A preliminary extraction and gas chromatographic technique for separation and quantitative determination of the free amino acids, using hydroxyproline as an internal standard, was developed.

Amino acids were converted into their trifluoroacetyl n-butyl (TAB) derivatives and gas chromatographed on 0.325 percent ethylene glycol adipate (EGA) columns. Resolution was generally good, but glycine-isoleucine and phenylalanine-aspartic acids were not resolved on old columns. The over-all …

Some Factors Affecting Germination And Seedling Growth Of Scotch Thistle, C. J. Scifres, M. K. Mccarty

Nebraska Agricultural Experiment Station: Historical Research Bulletins

Scotch thistle (Onopordum acanthium L.) is a native of Eurasia. Scotch thistle is found in the grasslands of central Nebraska, with heaviest infestations in Gosper, Dawson, and Valley Counties and limited occurrence in 18 additional counties. The Nebraska Unicameral declared it a noxious weed in 1965. This study measures the effects of some environmental factors on scotch thistle germination and seedling growth, and clarifies some of the interactions of these with inherent characteristics of the achene. The effect of achene coat, stratification, light, temperature, growth regulators, pH, depth of planting, salinity, germination inhibitors, and moisture stress were studied.

Behavior Of Pesticides In Plants, Logan A. Norris

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

A number of chemicals of diverse characteristics have arbitrarily been classed together on the basis of their use and given the descriptive name "pesticides. " An unfortunate aura of mystery has developed about these chemicals. However, there is nothing unique or mysterious about the chemicals we refer to as "pesticides." Like other chemicals, they have properties which can be accurately measured; they obey all the laws of physics, chemistry, and biology.

Chemical Firebreaks, Geoffrey A. Pearce

Journal of the Department of Agriculture, Western Australia, Series 4

MANY public bodies are making regular use of herbicides to create firebreaks. In Western Australia more than $200,000 is being spent on chemicals each year to protect property from fire.

In many situations where the buildings and property are of great value, the cost of the chemical becomes insignificant.

Anatomy Of Periderm And Cortex Of Fouquieriaceae, James Henrickson

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Simple Treatment Will Protect Farm-Stored Grain, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

WITH unusually large quantities of grain likely to be stored on farms this season, 1970 will be an important year for the control of pests in stored grain.

Infested grain from farms is responsible for almost all outbreaks of infestation in bulk storages, leading to costly treatment by the grain handling authority. Effective control on the farm would eliminate most of this.

Pasture Establishment In The Wheatbelt, M L. Poole

Journal of the Department of Agriculture, Western Australia, Series 4

The value of legume based wheatbelt pastures is so great that considerable care is warranted during their establishment. Without such care patchy establishment or even complete failure is likely to occur.

IN THE WHEATBELT too many farmers still put less effort into their seeding of pasture species than their seeding of crops.

This may be because both compete for the farmer's time in the busy seeding period and it is the cereal crop which possesses the obvious cash value.

However, the total value of a good pasture has to be assessed over a period of several years because of its …

Weed Control In Pastures : A Practical Approach For Sheep Areas, Geoffrey A. Pearce

Journal of the Department of Agriculture, Western Australia, Series 4

IN the past, chemical treatments for the control of weeds in pastures have been costly and severe on pasture, and have had to be repeated over a number of years. The method outlined in this article overcomes nearly all these disadvantages.

Control Of Clover Infertility In Sheep, H G. Neil, H. E. Fels, C. M. Francis

Journal of the Department of Agriculture, Western Australia, Series 4

A summary of practices recommended for the control of infertility caused by subterranean clover in West Australian sheep.

PROLONGED grazing of green subterranean clover pastures often reduces ewe fertility. In more extreme cases, obvious signs of clover disease occur.

High Stocking Rate On Kikuyu Dairy Pasture : Progress Report On Grazing Trials On Kikuyu-Sub. Clover Pasture At Denmark Research Station, F E. Ryan

Journal of the Department of Agriculture, Western Australia, Series 4

KIKUYU is one of the most valuable pasture plants on dairy farms in the South-West of Western Australia.

It combines well with subterranean clover and ryegrass if heavily stocked, and pastures managed in this way can be cut for legume-grass hay in the spring. However, relatively little is known of its carrying capacity or potential for production under grazing.

Wren Wheat Unimpressive In West Australian Trials, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

WREN WHEAT, the subject of current controversy in the Eastern States, has been tested in trials in Western Australia and the results have indicated that it is not likely to yield well in this State.

Lupins In Western Australia. 2. Cultivation Methods, John Sylvester Gladstones

Journal of the Department of Agriculture, Western Australia, Series 4

While lupins are by and large plants of lighter and less fertile soils, important differences exist among them in their soil preferences.

There may also be some differences in climatic requirements. Present knowledge of these differences is summarized in the Table below.

Linseed : An Alternative Crop For The South Coast, R J. Doyle, R. J. Guyton

Journal of the Department of Agriculture, Western Australia, Series 4

IN the over-17 inch rainfall zone of the south coast region of Western Australia animal production is the main farm enterprise.

Although farmers in the main cereal growing regions of W.A. crop about one-third of their cleared land each year, farmers in the south have been reluctant to crop more than about 12 per cent, of their cleared area.

Deferred Grazing Improves Soft Spinifex Association, H Suijdendorp

Journal of the Department of Agriculture, Western Australia, Series 4

THE Pastoral region in Western Australia where Triodia pungens (soft spinifex) makes up most of the vegetation, covers an area of about 17,000 square miles in the Forrest and De Grey pastoral areas.

On the deeper granitic sands in much of the region, plant associations revert to a pure stand of soft spinifex after about five or six years' grazing. It is common practice to burn at this stage, to encourage the re-establishment of other species and the production of palatable spinifex regrowth.

Engineering For Higher Yields, Yoshiaki Ishizuka

Department of Agronomy and Horticulture: Faculty Publications

It was difficult for me to understand the meaning of "engineering" as used in the title of my speech. I asked Dr. Haskins who told me that the term engineering is used here because one traditional role of the engineer has been the application of scientific principles in the solution of practical problems, and that in this case we want to consider the application of biological principles in both past and future increases in crop yield. Accordingly, I intend to express my thoughts on this problem, and to ask your suggestions for obtaining higher and better yields in the future. …