1,720,960 research outputs found
Life cycle and host plant of Lepyronia coleoptrata (L.) (Auchenorrhyncha Cercopidae) in northern Italy
No full textCultural control of Cameraria ohridella on horsechestnut in urban areas by removing fallen leaves in autumn
No full textSince the 1990s, the leafminer Cameraria ohridella has spread in central and southern Europe causing heavy damage on horsechestnut (Aesculus hippocastanum). Because biological control of the pest is not yet a reality, other measures must be adopted. Cultural control by removing fallen leaves of horsechestnut in autumn has often been proposed, and with this 3-year study the effectiveness of this practice under urban conditions has been shown and measured. The almost complete removal of leaves caused a significant reduction in infestation. The area of leaf surface injured decreased on average by more than 90% in early June, three quarters in late July, and a third in late August, and early leaf fall was always avoided. The proximity to sites with no leaf removal reduced the benefits of leaf removal as the season advanced. In the context of Integrated Pest Management, this cultural method contributes significantly to reduce C. ohridella damage
Mating disruption of the small fruit tortrix (Grapholita lobarzewskii) in organic apple orchards of northeastern Italy
No full textThe small fruit tortrix, Grapholita lobarzewskii (Nowicki) (Lepidoptera Tortricidae), is a serious problem in the organic apple orchards of the Friuli Venezia Giulia region (northeastern Italy), particularly in hilly areas. Three trials on mating disruption of G. lobarzewskii were carried out in two organic apple orchards characterized respectively by very high and low population pressure of this carpophagous pest. Red Isomate-OFM (C-plus)® dispensers, used for the control of the Oriental fruit moth, Grapholita molesta (Busck), were applied once a year at a rate of 600 dispensers/ha. The pheromone blend released from the dispensers has remarkable analogies with that of G. lobarzewskii. In plots where the dispensers were applied, the male catches in the pheromone traps were very low or null, indirectly confirming the mating reduction. A reduction of eggs laid on apple fruit was also observed. Mating disruption reduced significantly the percentage of apple fruit attacked by the small fruit tortrix both in the apple orchard with very high population pressure and in the orchard with low population pressure. A not negligible proportion of infested fruit rotted and fell much earlier with respect to harvest time and it suggests partial weight compensation by undamaged apple fruit. In the orchard with a high population pressure, mating disruption was not able to reduce the percentage of attacked apple fruit to acceptable levels. However, since alternative control methods against the small fruit tortrix are not currently available to organic agriculture, the mating disruption approach must be advised in all the apple-growing areas where this pest causes severe damage
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
Residual activity of chitin synthesis inhibitors on Lobesia botrana larvae reared in the laboratory on field collected grape berries
No full textVariations 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
- …
