Thesis (M.S.)--Ohio State University, 1944. / Includes bibliographical references (leaf 26). Available online via OhioLINK's ETD Center.

Thesis (M. S.)--Michigan State University, Dept. of Crop and Soil Science, 2006. / Title from PDF t.p. (viewed on November 12, 2007). Available through UMI ProQuest Digital Dissertations. Includes bibliographical references (leaves 88-93).

Thesis (M.S.)--Ohio State University, 1944. / Includes bibliographical references (leaf 44). Available online via OhioLINK's ETD Center.

A carlavirus was isolated from naturally-infected dandelions in the Okanagan Valley, B.C. In total, 31 plant species belonging to 12 families were tested as possible hosts for the dandelion virus. In only four families (Amaranthaceae, Chenopodiaceae, Compositae, Solanaceae) were susceptible species found. The virus was contained as local lesions in Gomphrena globosa and Datura stramonium and became systemic in Chenopodium amaranticolor, C. quinoa and Taraxacum officinale. The carlavirus, for which the name Dandelion Virus S (DVS) is proposed, has slightly curved particles with normal length 637 nm and width 12-13 nm. A purification scheme was developed that yielded 20-30 mg of virus per kg of C. quinoa leaf and stem tissue. Partially purified virus preparations had a single nucleoprotein component in rate zonal sucrose and cesium chloride density gradient centrifugation. The UV absorption spectrum has a maximum at 259 nm and a minimum at 245 nm. The ratio, of A[sub max]/A[sub min] is approximately 1.1; of A₂₆₀/A₂₈₀,1.4. In sap from infected C. quinoa, DVS had a thermal inactivation point of 75-80°; an infectivity dilution end point of 2 x 10⁻⁵ to 2 x 10⁻⁶ ; a longevity in vitro of 4-5 days at 23°, 28-56 days at 4° and at least 16.5 months in a lyophilized state at 23°. An antiserum against DVS was prepared by four intramuscular injections of 1 mg each and the maximum homologous titre was 40,960. Two carlaviruses with similar symptoms in C. quinoa, Peru virus S (PeVS) and Helenium virus S (HVS) were purified for antisera production and comparative serological testing. Antisera to other carlaviruses were also used to determine if serological relationships existed with DVS and other members of the group. Serologically, DVS is related to potato virus S (PVS) and PeVS, and distantly related to chrysanthemum virus B (CVB), Helenium virus S (HVS) and narcissus latent virus (NLV). / Land and Food Systems, Faculty of / Graduate

No description available.

Call number: LD2668 .T4 1978 Z44 / Master of Science

Thesis (Ph. D.)--University of Chicago, 1922. / "Private edition, distributed by the University of Chicago libraries, Chicago, Illinois." Contributions from the Hull botanical laboratory 293 and 295. "Reprinted from the Botanical gazette, vol. LXXIII, nos. 4 and 6, April and June, 1922." "Literature cited": p. 323-324, 446. Also available on the Internet.

No description available.

The compatibility of ACP 2100, a member of the imidazolinone family (chemistry not released), imazaquin (2- [4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H̱-imidazol2- yl]-3-quinolinecarboxylic acid) and triclopyr {[(3,5,6-trichloro-2-pyridinyl)oxy]acetic acid} was investigated for use in a turf management program, including growth regulation and broadleaf weed control. Field and greenhouse results indicated an antagonistic interaction between triclopyr and imazaquin for control of common dandelion (<i>Taraxacum officinale</i> Weber in Wigger). Addition of imazaquin at 276 g ha⁻¹ to triclopyr at 138 g ha⁻¹ resulted in less dandelion control than 138 plus 138 g ha⁻¹, respectively. Greenhouse and laboratory studies indicated a synergistic interaction between ACP 2100 and triclopyr, not apparent in the field. Addition of ACP 2100 to triclopyr at 34 and 69 g ha⁻¹ resulted in less than expected dandelion biomass, indicating increased dandelion control. ACP 2100 initially decreased triclopyr uptake, but resulted in greater uptake 48 hours after treatment. ACP 2100 also increased triclopyr translocation to the crown, root and middle rosette leaves. In the field and greenhouse, triclopyr did not influence growth regulation and decreased turf injury caused by ACP 2100. Studies showed that as the rate of ACP 2100 increased with the rate of triclopyr an antagonism occurred, resulting in decreased turf injury. The low rate of both ACP 2100 and imazaquin in combination resulted in equal turf growth regulation activity to the high rate of either chemical alone or in combination. One greenhouse study indicated that the interaction was synergistic for height suppression with ACP 2100 and imazaquin at rates of 12 plus 17 or 24 g ha⁻¹, respectively. However, field studies showed that ACP 2100/imazaquin combinations resulted in unacceptable injury to ‘l90’ and ‘Glade-Plush-Ram’ Kentucky bluegrass (<i>Poa pratensis</i> L.). The best turf quality, growth regulation and dandelion control was achieved with a combination of ACP 2100 at 96 and 144 g ha⁻¹ plus triclopyr at 276 g ha⁻¹. These results indicate that turf management costs may be reduced without sacrificing dandelion control by incorporating a chemical mowing program into a spring herbicide treatment. / Ph. D.

No description available.