scholarly journals Distribution, Incidence and Severity of the Catalpa Powdery Mildew Caused by Erysiphe elevata in North-Eastern Romania

2018 ◽  
Vol 10 (4) ◽  
pp. 614-617
Author(s):  
Vasilică C. CHINAN ◽  
Ciprian C. MÂNZU
Keyword(s):  
Powdery Mildew ◽  
Host Plant ◽  
North American ◽  
High Frequency ◽  
Green Spaces ◽  
The North ◽  
North Eastern

Erysiphe elevata is a North American fungus that causes the powdery mildew of Catalpa species. The present study brings new data on the spread of this species in Romania, and given its invasiveness in Europe, the study evaluates the incidence and intensity of the powdery mildew caused to Catalpa bignonioides (Southern catalpa). In 2017, 12 North-Estern Romanian cities where C. bignonioides had been planted in green spaces were investigated. The results have shown that the pathogen is widespread in the North-Estern part of Romania, accompanying the host plant in all of the localities investigated. In addition, the high frequency of the disease, confirms the invasiveness of E. elevata, most affected being the trees that were planted along streets and in public squares. A specimen of E. elevata was sequenced and the BLAST results revealed that it is identical to samples from France and Korea.

scholarly journals Daphnia diversity in water bodies of the Po River Basin

2016 ◽  
Author(s):  
Silvia Marková ◽  
Catia Maurone ◽  
Erica Racchetti ◽  
Marco Bartoli ◽  
Valeria Rossi
Keyword(s):  
River Basin ◽  
North American ◽  
Water Bodies ◽  
12S Rrna ◽  
Long Distance ◽  
Po River ◽  
The North ◽  
North Eastern ◽  
Northern European Russia ◽  
Po River Basin

<p>Shallow water bodies dominate the areal extent of continental waters and host a proportion of biodiversity higher than the percentage of Earth’s surface they cover. <em>Daphnia</em> is a key component of small aquatic ecosystems food webs. Here we present the result of a survey in 24 ponds located in the core of Po river Basin, to assess the actual spreading of <em>Daphnia</em> species in one of the most productive areas of the Northern hemisphere. By using diagnostic genetic markers (<em>12S rRNA </em>and <em>ND5 </em>genes) we identified five <em>Daphnia</em> species: <em>D. ambigua</em>, <em>D. curvirostris</em>, <em>D. longispina</em>, <em>D. obtusa</em> and <em>D. pulex </em>in fourteen ponds. Additional analyses of two nuclear genes (<em>LdhA</em> and <em>Rab4</em>) revealed that <em>D. pulex</em> in the study area is native European strain. In opposite, <em>D. ambigua</em> shared haplotype with the North-Eastern American lineage that was introduced to Europe by long-distance dispersal. In the Po river Basin we identified a highly divergent lineage of <em>D. longispina </em>group that formed a clade with individuals from northern European Russia and might represent a new <em>Daphnia </em>species. <em>Daphnia</em> species in the Cremona province have European origin, except for <em>D. ambigua</em> which is a North American species spreading across Europe. Future attention will require monitoring of invasive species, particularly <em>D. ambigua</em> and the North American invasive clone of <em>D. pulex </em>that is already present in Northern Italy. </p>

scholarly journals First records of the North American leafhopper Gyponana mail (Hemiptera: Cicadellidae) invading urban gardens and agroecosystems in Europe

2021 ◽  
pp. 213-219
Author(s):  
Valeria Trivellone ◽  
Vally Forte ◽  
Luisa Filippin ◽  
Christopher H. Dietrich
Keyword(s):  
Phylogenetic Analysis ◽  
Host Plant ◽  
North American ◽  
Male Genitalia ◽  
Morphological Study ◽  
European Population ◽  
Northern Italy ◽  
Urban Gardens ◽  
The North ◽  
Palearctic Region

The Nearctic leafhopper species Gyponana (Gyponana) mali DeLong, 1942 is reported from Europe for the fi rst time and represents the fi rst record of the tribe Gyponini Stål, 1870 (Hemiptera: Cicadellidae: Iassinae: Gyponini) for the Palearctic Region. Specimens were collected in southern Switzerland (Ticino) and two regions of northern Italy (Lombardy and Veneto) in 2015–2019. The preferred host plant in these areas appears to be Cornus sanguinea L. Phylogenetic analysis of the COI barcode sequences grouped one of the European specimens with three individuals of G. (G.) mali from Ontario, Canada. Morphological study indicated that the male genitalia of the European population are intermediate between G. (G.) mali and G. (G.) extenda DeLong, 1942.

Spread of the North American snowberry powdery mildew fungus, Erysiphe symphoricarpi (syn. Microsphaera symphoricarpi), to Europe

2002 ◽  
Vol 106 (9) ◽  
pp. 1086-1092 ◽  
Author(s):  
Levente Kiss ◽  
Adrien Bolay ◽  
Susumu Takamatsu ◽  
Roger T.A. Cook ◽  
Saranya Limkaisang ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
North American ◽  
Powdery Mildew Fungus ◽  
The North

scholarly journals Arboreal Coleoptera Associated with Leucosidea sericea (Rosaceae) at the Golden Gate Highlands National Park

Koedoe ◽  
1988 ◽  
Vol 31 (1) ◽  
Author(s):  
Schalk Louw
Keyword(s):  
Host Plant ◽  
National Park ◽  
Turnover Rate ◽  
Structural Complexity ◽  
Golden Gate ◽  
The North ◽  
North Eastern ◽  
Activity Cycles ◽  
Sun And Shade ◽  
Study Sites

An analysis was made of arboreal Coleoptera on Leucosidea sericea from the Golden Gate Highlands National Park in the north-eastern Orange Free State, Republic of South Africa. Five sites were selected from which samples were taken, using a beating technique, at equal intensity, during 13 consecutive months. A total of 117 species representing 35 families were recorded and allocated to four guilds, namely phytophages (47 species), predators (44 species), scavengers (16 species) and tourists (10 species). This diversity is attributed to the structural complexity and range of the host plant. The scarcity of a large number of these species is primarily ascribed to a high seasonal turnover rate. Species diversity and numbers of individuals were found to vary between the different study sites and are attributed to the growth stage and condition of the host plant, as well as the effect of sun and shade on activity cycles and the choice of feeding levels.

Ultrastructural and immunological demonstration of the nodulation of the European Alnus glutinosa (L.) Gaertn. host plant by the North-American Alnus crispa var. mollis Fern, root nodule endophyte

1977 ◽  
Vol 23 (11) ◽  
pp. 1529-1547 ◽  
Author(s):  
M. Lalonde ◽  
A. Quispel
Keyword(s):  
Host Plant ◽  
North American ◽  
Root Nodule ◽  
Light And Electron Microscopy ◽  
Root Hairs ◽  
Alnus Glutinosa ◽  
Bacterial Cells ◽  
Cortical Cells ◽  
Alnus Crispa ◽  
The North

The inoculation of the European Alnus glutinosa (L.) Gaertn. host plant by a crushed-nodule inoculum, prepared with the North-American Alnus crispa var. mollis Fern, root nodule, was successful. Fluorescein- and ferritin-labelled antibodies, specific against the A. crispa var. mollis root nodule endophyte (Lalonde et al. 1975), demonstrated the identity of this endophyte in the resulting nodules. The nodulation process of this abnormal host–endophyte system was studied by light and electron microscopy. An excretion of host blebs containing electron-dense polysaccharide material, resulting in the formation of exo-encapsulation threads containing presumptive endophytic bacterial cells, was associated with deformed root hairs. Originating from an exoen-capsulation thread, the endophyte penetrates the root hair cell and then migrates as a hypha toward the cortical cells of the root. Its migration in the cortical cells of the primary nodule results in the induction of a lateral root which develops as the true nodule. The ultrastructure of the A. crispa var. mollis endophyte developing in the primary and true nodule of the abnormal A. glutinosa host was similar to the one induced inside its normal A. crispa var. mollis host. The actinomycetal intruder was a branched and septate hypha able to produce septate vesicles. The endophyte was always encapsulated in an electron-dense polysaccharide material surrounded by a host plasma membrane envelope. However, in this abnormal host–endophyte system, the number of primary nodules formed per root system was drastically reduced, and their appearance was delayed by 1 to 2 weeks. The delayed nodules were effective in fixing nitrogen and able to support satisfactory plant growth in a nitrogen-free medium.

The genus Alucita in North America, with description of two new species (Lepidoptera: Alucitidae)

2004 ◽  
Vol 136 (4) ◽  
pp. 553-579 ◽  
Author(s):  
Bernard Landry ◽  
Jean-François Landry
Keyword(s):  
New York ◽  
British Columbia ◽  
New Species ◽  
North America ◽  
Host Plant ◽  
North American ◽  
Type Locality ◽  
Widespread Species ◽  
The North ◽  
Two New Species

AbstractThe North American fauna of Alucitidae is shown to include three widespread species: Alucita montana Barnes et Lindsey, 1921 (nec Cockerell), Alucita adriendenisisp. nov. (type locality: Manitoulin Island, Ontario, Canada), and Alucitalalanneisp. nov. (type locality: Maynooth, Ontario, Canada). Alucita hexadactyla (L., 1758) and A. huebneri Wallengren, 1862 do not occur in North America. The three North American species are described and illustrated. Alucita montana is found from southwestern Quebec and Vermont, west to British Columbia, and south to Arizona, California, and Texas; its caterpillar is associated with Symphoricarpos spp. (Caprifoliaceae). Alucita adriendenisi is known from northwestern Quebec and New York, west to Alberta and the Northwest Territories, with more southern populations (isolated?) in West Virginia, Arizona, and Texas; its caterpillar feeds on flowers of Lonicera dioica L. (Caprifoliaceae) in Michigan. Alucita lalannei has been found in Ontario, Manitoba, and Alberta, Canada; its host plant is unknown.

Polysynthesis in the Arctic/Sub-Arctic

2017 ◽  
Author(s):  
Michael Fortescue
Keyword(s):  
North American ◽  
The Arctic ◽  
The North ◽  
North Eastern ◽  
Siberian Arctic ◽  
The World ◽  
Language Area

The North American and north-eastern Siberian Arctic and Sub-Arctic contain a large contiguous area of highly polysynthetic languages belonging to three language families, Eskimo-Aleut, Chukotko-Kamchatkan, and Na-Dene. These contain some of the most extreme and yet diverse polysynthetic languages in the world; between them they cover three of the main sub-types of polysynthesis, respectively the suffixing-only, the noun-incorporating, and the templatic type. There has been contact influence between all three (especially between Eskimo and Chukotian), but they do not form a canonical language area as regards the diffusion of polysynthesis. The polysynthetic profile of the principal languages concerned is sketched, as well as those of somewhat less highly polysynthetic Aleut, Itelmen, and Tlingit.

scholarly journals On the inference of a southern origin of the North American firefly Photinus pyralis

2019 ◽  
Author(s):  
Ana Catalán ◽  
Sebastian Höhna ◽  
Sarah E. Lower ◽  
Pablo Duchen
Keyword(s):  
North American ◽  
Eastern Coast ◽  
Ecological Niches ◽  
Photinus Pyralis ◽  
The North ◽  
Ideal System ◽  
Wide Range ◽  
North Eastern ◽  
Demographic Inference ◽  
Population Demographic

AbstractThe firefly Photinus pyralis inhabits a wide range of latitudinal and ecological niches, with populations living from temperate to tropical habitats. Its ample geographic distribution makes this species an ideal system for the study of local adaptation and demographic inference of wild populations. Therefore, in this study we modelled and inferred different demographic scenarios for North American populations of P. pyralis, collected from Texas to New Jersey. To do this, we used a combination of ABC techniques (for multi-population/colonization analyses), and likelihood inference (dadi) for single-population demographic inference, which proved useful with our RAD data.We uncovered that the most ancestral North American population lays in Texas, which further colonized the Central region of the US and more recently the North Eastern coast. Our study confidently rejects a demographic scenario where the North Eastern populations colonized more southern populations until reaching Texas. Our results suggest that P. pyralis originated in Central- or South America, followed by migration events that populated northern latitudes. Finally, modelling the demographic history of North American P. pyralis serves as a null model of nucleotide diversity patterns, which will inform future studies of adaptation, not only in P. pyralis, but also in other North American taxa.

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