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Fusarium rhizome rot of ginger in Queensland
Get PDFA rhizome rot of ginger in Queensland is shown to be caused by a strain of Fusarium oxysporum and is considered to be a distinct form referred to F. oxysporum f. zingiberi Trujillo. Control of the disease in artificially inoculated ginger rhizomes was obtained with ethoxyethyl mercury chloride (6% Hg) at 1 lb in 40 gal for 30 min or 2 lb in 40 gal for 10 min. Control was not obtained with a dip treatment with captan, with dust treatments with captan or chloranil, or by curing rhizome pieces for five days before inoculation
Technical notes. A lucerne root rot caused by Pythium myriotylum
Get PDFEach of three isolates of P. myriotylitm proved virulently pathogenic to lucerne seedlings under the conditions of the test. The stems and leaves of inoculated plants became shrivelled, wilted and curled. The most practicable way of reducing losses from root rot caused by Pythimn niyriotylimi appears to be to correct unsatisfactory cultural conditions as far as possible
Technical notes. Puccinia argophylli sp. N. on Argophyllum nullumense in Queensland
No full textIn January 1957 a collection of inconspicuously rusted leaves of the scrub tree Argophyllum nullumense R. T. Baker was made on "The Lost World," a small rain-forest plateau in the rugged McPherson Range of southeastern
Queensland. Argophyllun is a genus of the family Saxifragaceae, tribe Escallonieae. No rust has been recorded from this genus or the related Quintinia, Abrophyllum, Cuttsia, Polyosma and Anopterus. The rust is therefore considered to be an unnamed species, and is described below
Papaw root rot caused by Phytophthora palmivora Butl.
Get PDFA severe root rot of papaw (Carica papaya Gaertn.) in Queensland is caused by Phytophthora palmivora Butl. Waterlogging is an important predisposing factor in the occurrence of the disease. In the Brisbane area, soil temperatures are favourable for growth and sporulation of P. palmivora, except during June, July and August. Field evidence suggests that crop rotation reduces the severity of attack. P. palmivora isolated from roots proved capable of rotting green papaw fruit, but a similar fruit rot has not been found naturally in Queensland
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Abiotic transmission of southern bean mosaic virus in soil
No full textWhen soil in pots was infested with southern bean mosaic virus (SBMV), it became infective for highly susceptible Phaseolus vulgaris bait plants. Soil could be infested by adding either infected plant tops or roots or by growing infected plants in it. Release of SBMV by roots of P. vulgaris cv. Red Kidney reached a maximum at flowering and thereafter declined, but some virus was still recovered in drainage water when the plants were dead. When grown in infested soil P. vulgaris cv. Bountiful was more susceptible to infection at 26°C than at 21 or 32°C, temperatures which were less favourable for plant growth. The addition to virus-infested soil of tomato roots carrying nematodes (Meloidogyne sp.), fungi and other soil biota did not increase virus infection in bait plants. It is concluded that SBMV resembles tobacco mosaic virus in being able to infect plant roots abiotically in infested soil
Species of Pythium in Queensland
Get PDFFourteen species of Pythium have been recorded in Queensland. Notes are given on the morphological and cultural characters found useful in identifying these species. Growth-temperature studies confirm that maximum temperature can be used as an aid to morphology in identification. An annotated host index for Queensland is presented
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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