1,720,967 research outputs found
First record of the bronze bug, Thaumastocoris peregrinus Carpintero & Dellapé (Heteroptera: Thaumastocoridae), a new exotic pest of Eucalyptus trees in Italy
Full text linkIn September 2011, the bronze bug Thaumastocoris peregrinus Carpintero & Dellapé (Heteroptera: Thaumastocoridae) was detected in Italy infesting Eucalyptus spp. in several urban and rural sites of the Latium region (Italy) (Laudonia & Sasso, 2012). This is the first record of a member of the family Thaumastocoridae from the European and Mediterranean region. Until recently, the Australian group of Thaumastocoridae was considered rare (Cassis et al., 1999), but over the past 10 years, T. peregrinus has rapidly established as a severe pest on 13 species of Eucalyptus and Corymbia citriodora subsp. citriodora in Australia (Noack & Rose, 2007; Noack et al. 2009), and spread to South America (Martinez-Crosa, 2008; Carpintero & Dellapé 2006; Noack & Coviella, 2006; Wilcken et al., 2010; Savaris et al., 2011) and South Africa (Jacobs & Neser, 2005; Giliomee, 2011).
The adult of T. peregrinus is characterized by a strongly dorso-ventrally compressed and elongate body between 2-3.5 mm in length, a broad head, pedicellate eyes, and elongate conspicuous mandibular plates which are curved and broad on the outer margin (Noack et al., 2011). The body is light brown with darker areas. The male genital capsule is asymmetrical. The eggs are dark, oval, with a sculptured chorion and a round operculum, on average 0.5 mm long and 0.2 mm wide. The crawlers and young nymphs are essentially orange, with black spots on the thorax and first abdominal segments. A detailed description of T. peregrinus has been published by Carpintero and Dellapé (2006), and more recently a re-description of the species has been published by Noack et al. (2011).
Infested Eucalyptus trees show leaf silvering, ranging from chlorosis to bronzing. Heavy infestations cause leaves to become red/brown and defoliation occurs. These symptoms are particularly serious and evident on E. grandis, while the prevalent symptoms on other Eucalyptus species are silver leaves. The bronze bugs are also considered as a nuisance, having been reported to ‘sting’ people in urban parks, playgrounds, etc. (Jacobs & Neser, 2005).
In Southern Europe (Italy, Spain and Portugal), Eucalyptus species are probably the only large scale and economically successful short rotation tree plantations also used for industrial purposes, such as production of sawn wood, wood pulp, charcoal and biomass fuel. The nectar from flowers of some eucalypts produces high-quality of monofloral honey. T. peregrinus is a serious pest of Eucalyptus species in the Southern Hemisphere and could become a forest and urban pest in Southern Europe and in the Mediterranean Basin
Andamento delle popolazioni e fenologia di Glycaspis brimblecombei Moore (Hemiptera: Aphalaridae), Psilla del follicolo bianco ceroso dell’Eucalipto rosso
No full textSeasonal occurrence and adaptation of the exotic Glycaspis brimblecombei Moore (Hemiptera: Aphalaridae) in Italy
No full textAlien insects usually adapt their phenology and their needs to the environment into which they are introduced. During 2010, the red gum lerp psyllid, Glycaspis brimblecombei, was accidentally introduced into Italy, becoming an invasive pest of Eucalyptus L'Hér. Eucalypts are very common in Italy as ornamental and forest species. The seasonal adaptation of the psyllid was studied at three field sites. G. brimblecombei showed a seasonal population dynamic, suggesting that many generations occur during the year and the species overwinters in all stages without diapause. The population size in the new area of colonization is affected by low winter temperatures, but also by high temperatures in the absence of rainfall. In Lazio, the specific parasitoid Psyllaephagus bliteus was collected for the first time
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“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
Full text linkWe 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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