APHIDS ON STRAWBERRY IN NOVA SCOTIA

1968 ◽  
Vol 100 (8) ◽  
pp. 869-878 ◽  
Author(s):  
H. T. Stultz
Keyword(s):  
Nova Scotia ◽  
Myzus Persicae ◽  
The Other ◽  
Macrosiphum Euphorbiae ◽  
Consistent Difference ◽  
Fragaria Vesca ◽  
The Third ◽  
Winter Cover ◽  
Aulacorthum Solani

AbstractFifty-six species were recognized among 6886 aphids identified in 312 collections taken from strawberry plantations in Nova Scotia, 1961–1966. Forty-nine species were classed as errants and seven were classed as colonizers on strawberry. The most numerous colonizers were Rhodobium porosum (Sanderson) and Macrosiphum euphorbiae (Thomas), averaging 71 and 18.5% respectively of all the aphids identified. The other colonizers were Aphis forbesi Weed (1.4%), Aulacorthum solani (Kaltenbach) (1.0%). Myzus persicae (Sulzer) (1.0%), Chaetosiphon fragaefolii (Cockerell) (0.1%), C. minor (Forbes) (0.2%), and Chaetosiphon sp. (0.1%).Colonizers, mostly R. porosum, were observed on strawberry plantations from the time winter cover was removed in the spring until late in November when a winter cover was applied. Alate viviparous females were first observed during the second week of June on both old and new plantations and were most numerous during a period extending from the third week m June until nearly the end of August. Nymphs were first seen on new plantations when the first alatae were observed. Apterous viviparae reached near-maximum numbers early in July and were present, sometimes in relatively high number, until nearly the end of September. Sexuales began to appear late in September, reached peak numbers early in November, and were still present when observations were discontinued late in November. No consistent difference was noted in the numbers of aphids alighting on or colonizing plants of three different commercial strawberry varieties (Sparkle, Catskill, and Robinson). The amount of colonization was markedly greater on the commercial varieties than it was on Fragaria vesca L. (EMC). The significance of the results in relation to the control of aphid-borne viruses is discussed.

APHID DISSEMINATION OF STRAWBERRY VIRUSES IN NOVA SCOTIA

1964 ◽  
Vol 44 (3) ◽  
pp. 235-239 ◽  
Author(s):  
D. L. Craig ◽  
H. T. Stultz
Keyword(s):  
Nova Scotia ◽  
Myzus Persicae ◽  
Dominant Species ◽  
Virus Disease ◽  
Mottle Virus ◽  
Fragaria Vesca ◽  
Disease Symptoms ◽  
Indicator Plants ◽  
Aulacorthum Solani

In Nova Scotia, strawberry virus disease symptoms appeared in 12% of the Fragaria vesca L. (EMC) plants present in faunal study plots planted in 1961 and in 14% in plots planted in 1962.Latent-C virus and mottle virus were the dominant diseases and were present in approximately equal numbers of the indicator plants. A smaller number of indicator planes were dwarfed but otherwise free of symptoms associated with previously described virus diseases.Known vectors present in the plots included Rhodobium porosum (Sanderson), Myzus persicae (Sulz.), Aulacorthum solani (Kalt.), Amphorophura rubi (Kalt.), and Pentatrichopus minor (Forbes). R. porosum was the dominant species.

Aphid (Hemiptera: Aphididae) populations and the incidence of virus yellows on insecticide-free sugarbeet in south-eastern England in 1978-81

1987 ◽  
Vol 77 (4) ◽  
pp. 617-628 ◽  
Author(s):  
W. A. Thornhill ◽  
G. D. Heathcote
Keyword(s):  
Myzus Persicae ◽  
Annual Variation ◽  
Aphid Species ◽  
The Other ◽  
Aphis Fabae ◽  
Macrosiphum Euphorbiae ◽  
South Eastern ◽  
Winter Temperatures ◽  
Syrphid Larvae ◽  
Aphid Populations

AbstractThe populations of the most common aphid species on sugarbeet, and their principal predators, were monitored on insecticide-free study areas of the crop in south-eastern England in 1978–81. The peak populations of Myzus persicae (Sulzer) varied considerably in size from year to year and were related to the severity of the previous winter. Those of Aphis fabae fabae Scopoli, which occurred slightly later in the season, also varied greatly in size but were not strongly linked to winter temperatures. The sizes of the peak populations of Macrosiphum euphorbiae (Thomas) were similar each year. The annual variation in the level of infection by virus yellows reflected the peak populations of Myzus persicae and not those of the other aphid species. Coccinellids first appeared in the sugarbeet each year in mid-late June, as the aphid populations were developing, and their peak populations did not vary greatly from year to year. Syrphid larvae appeared later in the season than coccinellids, and their numbers seemed closely linked to those of A. f. fabae. Anystid mites were observed on most count dates in all years. The implications of the findings of the study for control of aphids and virus yellows are discussed.

The development of Monoctonus paludum Marshall (Hym., Braconidae) in Nasonovia ribis-nigri on lettuce, and immunity reactions in other Lettuce Aphids

1961 ◽  
Vol 52 (1) ◽  
pp. 147-163 ◽  
Author(s):  
D. C. Griffiths
Keyword(s):  
Myzus Persicae ◽  
Blood Cells ◽  
The Other ◽  
Degenerative Changes ◽  
Macrosiphum Euphorbiae ◽  
Time Intervals ◽  
Developmental Processes ◽  
Capsule Formation ◽  
Normal Host ◽  
Aphid Host

Aphids belonging to the species Nasonovia ribis-nigri (Mosley), Aulacorthum circumflexum (Buckt.), Macrosiphum euphorbiae (Thos.), Myzus persicae (Sulz.) and A. solani (Kalt.) were exposed to attack by the parasite, Monoctonus paludum Marshall, and were sectioned and dissected at various time-intervals after attack in order to observe the developmental processes of the parasite.The egg was always laid in the posterior mass of fused ventral nerve ganglia in the thorax of the aphid host.The development of the parasite in N. ribis-nigri, its normal host on lettuce, is described.In the species A. circumflexum the development of the parasite was arrested after approximately 24 hours by the secretion around it of a thin brown capsule formed by certain of the host's blood cells.In the other three species, Macrosiphum euphorbiae, Myzus persicae and A. solani, no capsule formation occurred. The development of the parasite embryos was rather variable in these but it was common for parasites in Macrosiphum euphorbiae to reach the stage normal for 24-hour embryos and for parasites in Myzus persicae and A. solani to reach stages rather less advanced than this before degenerative changes set in.The degenerative changes in the parasite embryos are described for each species of aphid and the nature of these changes is discussed.

Efficacy of some insecticide modules against major insect pests and spider population of rice, Oryza sativa L.

ENTOMON ◽  
2018 ◽  
Vol 43 (4) ◽  
pp. 257-262
Author(s):  
Atanu Seni ◽  
Bhimasen Naik
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Untreated Control ◽  
Insect Pests ◽  
Oryza Sativa L ◽  
Gall Midge ◽  
Stem Borer ◽  
The Other ◽  
The Third ◽  
Treated Plot

Experiments were carried out to assess some insecticide modules against major insect pests of rice. Each module consists of a basal application of carbofuran 3G @ 1 kg a.i ha-1 at 20 DAT and Rynaxypyr 20 SC @ 30 g a.i ha-1 at 45 DAT except untreated control. All modules differ with each other only in third treatment which was applied in 65 DAT. The third treatment includes: Imidacloprid 17.8 SL @ 27 g a.i ha-1, Pymetrozine 50 WG @ 150 g a.i ha-1, Triflumezopyrim 106 SC @ 27 g a.i ha-1, Buprofezin 25 SC @ 250 g a.i ha-1; Glamore (Imidacloprid 40+Ethiprole 40% w/w) 80 WG @ 100 g a.i. ha-1, Thiacloprid 24 SC @ 60 g a.i ha-1, Azadirachtin 0.03 EC @ 8 g a.i ha-1, Dinotefuran 20 SG@ 40 g a.i ha-1 and untreated control. All the treated plots recorded significantly lower percent of dead heart, white ear- head caused by stem borer and silver shoot caused by gall midge. Module with Pymetrozine 50 WG @ 150 g a.i ha-1 treated plot recorded significantly higher per cent reduction of plant hoppers (>80% over untreated control) and produced higher grain yield (50.75 qha-1) than the other modules. Among the different treated modules the maximum number of spiders was found in Azadirachtin 0.03 EC @ 8 g a.i ha-1 treated module plot followed by other treatments.

Retroaktive Neuverhandlung

2018 ◽  
Vol 63 (1) ◽  
Author(s):  
Daniel Martin Feige
Keyword(s):  
Original Work ◽  
The Other ◽  
Final Part ◽  
Critical Reading ◽  
The Third ◽  
Works Of Art ◽  
The Relationship

Der Beitrag widmet sich der Frage historischer Folgeverhältnisse in der Kunst. Gegenüber dem Gedanken, dass es ein ursprüngliches Werk in der Reihe von Werken gibt, das späteren Werken seinen Sinn gibt, schlägt der Text vor, das Verhältnis umgekehrt zu denken: Im Lichte späterer Werke wird der Sinn früherer Werke neu ausgehandelt. Dazu geht der Text in drei Schritten vor. Im ersten Teil formuliert er unter der Überschrift ›Form‹ in kritischer Abgrenzung zu Danto und Eco mit Adorno den Gedanken, dass Kunstwerke eigensinnig konstituierte Gegenstände sind. Die im Gedanken der Neuverhandlung früherer Werke im Lichte späterer Werke vorausgesetzte Unbestimmtheit des Sinns von Kunstwerken wird im zweiten Teil unter dem Schlagwort ›Zeitlichkeit‹ anhand des Paradigmas der Improvisation erörtert. Der dritte und letzte Teil wendet diese improvisatorische Logik unter dem Label ›Neuaushandlung‹ dann dezidiert auf das Verhältnis von Vorbild und Nachbild an. The article proposes a new understanding of historical succession in the realm of art. In contrast to the idea that there is an original work in the series of works that gives meaning to the works that come later, the text proposes to think it exactly the other way round: in the light of later works, the meanings of earlier works are renegotiated. The text proceeds in three steps to develop this idea. Under the heading ›Form‹ it develops in the first part a critical reading of Danto’s and Eco’s notion of the constitution of the artworks and argues with Adorno that each powerful work develops its own language. In the second part, the vagueness of the meaning of works of art presupposed in the idea of renegotiating earlier works in the light of later works is discussed under the term ›Temporality‹ in terms of the logic of improvisation. The third and final part uses this improvisational logic under the label ›Renegotiation‹ to understand the relationship between model and afterimage in the realm of art.

Features of the course and treatment of glaucoma during pregnancy

2020 ◽  
Vol 98 (3) ◽  
pp. 178-184
Author(s):  
T. V. Chernyakova ◽  
A. Yu. Brezhnev ◽  
I. R. Gazizova ◽  
A. V. Kuroyedov ◽  
A. V. Seleznev
Keyword(s):  
Pregnant Women ◽  
Laser Treatment ◽  
Progressive Disease ◽  
Clinical Course ◽  
The Other ◽  
Third Trimester ◽  
The Third ◽  
Chronic Progressive Disease ◽  
Hypotensive Therapy ◽  
Eye Pressure

In the review we have integrated all up-to-date knowledge concerning clinical course and treatment of glaucoma among pregnant women to help specialists choose a proper policy of treatment for such a complicated group of patients. Glaucoma is a chronic progressive disease. It rarely occurs among childbearing aged women. Nevertheless the probability to manage pregnant patients having glaucoma has been recently increasing. The situation is complicated by the fact that there are no recommendations on how to treat glaucoma among pregnant women. As we know, eye pressure is progressively going down from the first to the third trimester, so we often have to correct hypotensive therapy. Besides, it is necessary to take into account the effect of applied medicines on mother health and evaluate possible teratogenic complications for a fetus. The only medicine against glaucoma which belongs to category B according to FDA classification is brimonidine. Medicines of the other groups should be prescribed with care. Laser treatment or surgery may also be a relevant decision when monitoring patients who are planning pregnancy or just bearing a child. Such treatment should be also accompanied by medicines.

The Nile Delta during the Early Dynastic and Old Kingdom periods. Preliminary remarks on the evolution of settlement landscape

2020 ◽  
pp. 13-61
Author(s):  
Natalia Małecka-Drozd
Keyword(s):  
Nile Delta ◽  
Ancient Egypt ◽  
The Other ◽  
Old Kingdom ◽  
The Third ◽  
Other Hand ◽  
Early Dynastic ◽  
Territorial Structure ◽  
Settlement Landscape ◽  
New Settlements

The 3rd millennium BC appears to be a key period of development of the historical settlement landscape in ancient Egypt. After the unification of the country, the process of disappearance of the predynastic socio-political structures and settlement patterns associated with them significantly accelerated. Old chiefdoms, along with their centres and elites, declined and vanished. On the other hand, new settlements emerging in various parts of the country were often strictly related to the central authorities and formation of the new territorial administration. Not negligible were climatic changes, which influenced the shifting of the ecumene. Although these changes were evolutionary in their nature, some important stages may be recognized. According to data obtained during surveys and excavations, there are a number of sites that were considerably impoverished and/or abandoned before and at the beginning of the Old Kingdom. On the other hand, during the Third and Fourth Dynasties some important Egyptian settlements have emerged in the sources and begun their prosperity. Architectural remains as well as written sources indicate the growing interest of the state in the hierarchy of landscape elements and territorial structure of the country.

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