Causes of Variations in Effectiveness of Bracon cephi (Gahan) (Hymenoptera: Braconidae) as a Parasite of the Wheat Stem Sawfly

1963 ◽  
Vol 95 (2) ◽  
pp. 113-126 ◽  
Author(s):  
N. D. Holmes ◽  
W. A. Nelson ◽  
L. K. Peterson ◽  
C. W. Farstad
Keyword(s):  
Host Plants ◽  
First Generation ◽  
Second Generation ◽  
Wheat Stem Sawfly ◽  
Sawfly Larvae ◽  
Early Ripening ◽  
Low Levels ◽  
One Year ◽  
High Level

AbstractAdults of B. cephi emerged at the same time as the adults of their host, the wheat stem sawfly, and started to oviposit about mid-July. The second generation started to emerge between August 5 and 15. This generation, which was complete in some years, was apparently only partial in years in which adults of the first generation continued to oviposit late in the season. In most cases the larvae of Bracon that were present at harvest time were from eggs laid after August 1.Most of the overwintering B. cephi were located in the lower internodes of the sawfly-infested wheat stems. Although B. cephi attacked some sawfly larvae in their stubs most sawflies escaped parasitism once they had cut their host stems.High host densities per stem in hollow-stemmed wheats were detrimental to Bracon during the early part of the season as the unparasitized sawfly larvae in stems containing B. cephi destroyed the parasite larvae.The sawfly-susceptible wheats were more suitable than the resistant for parasitism. Generally, differences in parasitism between wheats and between barleys were caused by differences in length of survival of the sawfly larvae in the different host plants; longer survival led to higher parasitism.The fluctuations in amounts of parasitism mainly depended on the synchronization of development between B. cephi and the sawfly. Parasitism increased when the sawfly larvae cut their host stems sufficiently late to allow establishment by the second generation of B. cephi and decreased when the sawfly cut too early for parasitism by the second generation. The date of ripening of the host plant governs the date of cutting by the sawfly; hence, the amount of parasitism is influenced by the levels of soil moisture and temperature during the growing season, by differences in rate of development of various plant hosts, and by the date of seeding. Low levels of parasitism resulted from early ripening of the sawfly host plants in two consecutive years, whereas a moderately high level occurred even though the weather of the current year was conducive to early ripening, provided that the wheat in the preceding year had ripened late. It appears that moderate to high levels of parasitism required that the crop ripen late in at least one year out of two.

A Survey of Five Stem-Feeding Insect Pests of Wheat in the Northern Great Plains

2006 ◽  
Vol 41 (1) ◽  
pp. 40-48 ◽  
Author(s):  
Thomas G. Shanower ◽  
Debra K. Waters
Keyword(s):  
Great Plains ◽  
Insect Pests ◽  
Insect Pest ◽  
Hessian Fly ◽  
Northern Great Plains ◽  
Insect Pest Management ◽  
Extension Programs ◽  
Wheat Stem Sawfly ◽  
Sawfly Larvae ◽  
Low Levels

The wheat stem sawfly, Cephas cinctus Norton, the wheat stem maggot, Meromyza americana Fitch, the Hessian fly, Mayetiola destructor (Say), the wheat jointworm, Tetramesa tritici (Fitch), and the wheat strawworm, Tetramesa grandis (Riley), have long been considered wheat pests in the northern Great Plains. This paper reports results of surveys for these pests conducted over 3 yrs in parts of Montana (10 counties), North Dakota (14 counties), South Dakota (1 county), Nebraska (4 counties) and Wyoming (1 county). Fields were randomly selected and a mean of 191 stems were sampled from each field. The percentage of stems infested with each pest was recorded. The percentage of parasitized wheat stem sawfly larvae also was noted. The wheat stem sawfly, wheat stem maggot, and Hessian fly were the most commonly encountered pests, recorded in nearly every county. Wheat stem sawfly density was twice that of wheat stem maggot (7% vs 3.2%) in infested fields. Wheat stem sawfly densities exceeded 10% in 4 counties: Daniels and Wibaux in MT, Golden Valley, ND and Goshen, WY. Wheat stem sawfly parasitism was low and positively correlated with sawfly infestation. Wheat stem maggot infestations were low (<11% for all fields), averaging 3.2% among infested fields. Hessian fly densities were much lower (2.2% among infested fields) than reported elsewhere in the U.S. The wheat jointworm and strawworm were absent from most fields and only occasionally found at low levels (<1% and <3.5% respectively, among infested fields). This information will help to prioritize wheat insect pest management research and extension programs in this region.

Abstract 11019: Incidence and Predictors for Late Acquired Stent Malapposition of Drug-Eluting-Stents With Second-Generation Permanent and Biodegradable Polymer-Coatings - A Prospective, Randomized Comparison Using Optical Coherence Tomography

Circulation ◽  
2014 ◽  
Vol 130 (suppl_2) ◽  
Author(s):  
Christian Roth ◽  
Clemens Gangl ◽  
Daniel Dalos ◽  
Sabine Scherzer ◽  
Lisa Krenn ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Biodegradable Polymer ◽  
First Generation ◽  
Second Generation ◽  
Polymer Coatings ◽  
Drug Eluting Stents ◽  
Optical Coherence ◽  
Elective Treatment ◽  
Drug Eluting ◽  
One Year

Introduction: The polymers releasing the drug of first-generation drug-eluting stents (DES) may induce allergic reactions and inflammation, resulting in late-acquired stent malapposition (LASM) with uncoverage of struts, and risk of stent thrombosis. The incidence and predictors of LASM in DES with different polymers designed to improve biocompatibility are unknown. Methods: Fifty patients with 59 lesions of interest were randomized to elective treatment with Everolimus-eluting stents (EES; n=17, 20 lesions)], Zotarolimus-eluting stents (ZES; n=15, 19 lesions), and Biolimus-eluting stents (BES; n=18, 20 lesions) and underwent optical coherence tomography after implantation and after one year. Results: After implantation 29 early stent malappositions (ESM) were documented in 29 lesions (49% of lesions), distributed to 11 lesions treated with EES (55%), 11 with ZES (58%), and 7 with BES (35%; n.s.). After one year 14 late stent malappositions (LSM) in 14 lesions (24%) were detected; nine ESM persisted (EPSM) after one year (1 EES, 6 ZES, 2 BES), whereas 20 ESM resolved. In addition, 9 LASM were documented (5 LASM in early well-apposed Stents, 4 LASM in Stents which also have EPSM). LASM was present in 7 hydrophilic polymer-coated ZESs (37%), in 2 fluoropolymer-coated EESs (10%), and in none of the biodegradable polymer-coated BESs (p=0.003). Independent predictors of LASM were the vessel treated (RCA as vessel with high motion; p<0.022) and type of polymer (biodegradable or permanent; p<0.035). Conclusion: The incidence of ESM and EPSM were similar, whereas the incidence of LASM was different in second-generation DES with different polymers. Biodegradable polymer prevented LASM, stent locations with significant vessel movement (RCA) enhanced LASM.

scholarly journals TCTAP A-087 Angioscopic Comparison of First Generation Sirolimus-eluting Stent and Second Generation Zotarolimus-eluting Stent Beyond One Year

2017 ◽  
Vol 69 (16) ◽  
pp. S47-S48
Author(s):  
Takuya Tsujimura ◽  
Takayuki Ishihara ◽  
Osamu Iida ◽  
Shin Okamoto ◽  
Kiyonori Nanto ◽  
...  
Keyword(s):  
First Generation ◽  
Second Generation ◽  
Sirolimus Eluting Stent ◽  
One Year

POPULATION DYNAMICS OF THE WHEAT STEM SAWFLY, CEPHUS CINCTUS (HYMENOPTERA: CEPHIDAE), IN WHEAT

1982 ◽  
Vol 114 (9) ◽  
pp. 775-788 ◽  
Author(s):  
N. D. Holmes
Keyword(s):  
Population Dynamics ◽  
Host Plants ◽  
Weather Conditions ◽  
Growing Season ◽  
Field Margins ◽  
Wheat Stem Sawfly ◽  
Cephus Cinctus ◽  
Southern Alberta ◽  
One Year ◽  
Major Factors

AbstractThe effects of the major factors on populations of the wheat stem sawfly, Cephus cinctus Norton, were studied in the field at Lethbridge, Alberta between 1970 and 1977. Fecundity of the females, which contain an average of 32.7 eggs, is influenced by the condition and variety of host plants in which they develop as larvae. Populations of the adults that emerge from infested crops cut 7–9% by the larvae in one year may infest 70–80% of the stems of adjacent crops in the following year. Increased adult densities, however, fail to increase markedly the percentage of stems infested because the adults concentrate at field margins when they reinfest the most preferred stems. Because only one larva can mature in each stem, competition within stems that receive more than one egg causes a major drop in the population but not in the percentage of infested stems cut. Another major drop is caused by host plant resistance, which is influenced in both susceptible and resistant wheats by the weather during the growing season. On an average, all of the larvae die in 28% of the infested stems of two susceptible wheats and in 67% of those of a resistant wheat. The mortality in resistant wheats, however, is generally not sufficient to prevent economic infestations in subsequent years. Parasitism, which was a major factor in only 7 of 36 years in southern Alberta, is increased by weather conditions that cause delayed ripening of the wheat crops. The mortality of mature larvae and pupae averaged 21.3%. It is affected by extremes of moisture and temperature and can be increased slightly by shallow tillage of infested stubble.

scholarly journals Ultra-Deep Sequencing Leads to Earlier and More Sensitive Detection of Known or Novel Mutations of BCR-ABL1 in Chronic Myeloid Leukemia

Blood ◽  
2018 ◽  
Vol 132 (Supplement 1) ◽  
pp. 5429-5429
Author(s):  
Hongli Xiao ◽  
Heng Wang ◽  
Jin Lou ◽  
Weihong Chen ◽  
Qiaoxia Zhang ◽  
...  
Keyword(s):  
Deep Sequencing ◽  
First Generation ◽  
Kinase Inhibitors ◽  
Clinical Laboratory ◽  
Conflicts Of Interest ◽  
Clinical Samples ◽  
Tki Resistance ◽  
Low Levels ◽  
High Level ◽  
Level Resistance

Abstract Detection of BCR-ABL1 mutations that inhibit tyrosine kinase inhibitors is important for the treatment of CML patients. Sanger sequencing (SS) technique is considered the gold standard for mutation detection in a clinical laboratory. We analyzed 40 clinical samples from 22 CML patients with TKI resistance by ultra-deep sequencing (UDS) and compared the results with classical SS-based tests. UDS facilitates the detection of low levels of mutations (<20% allele frequencies) that SS does not detect. In subgroups of cases with multiple mutations, UDS was also able to determine whether two mutations were on same BCR-ABL1 allele (compound) or not (polyclonal). We found a pair of compound mutations unreported: F359C/E450 which confer high-level resistance to first-generation TKI imatinib, second-generation TKIs dasatinib and nilotinib, third-generation TKI ponatinib and a new TKI GZD824. UDS provides a reliable method for identifying low levels of BCR-ABL1 mutations. Disclosures No relevant conflicts of interest to declare.

Field evaluation of the suitability of four Brassica and two Sinapis species (Brassicaceae) as host plants of Lygus lineolaris (Palisot de Beauvois) (Heteroptera: Miridae)

1996 ◽  
Vol 76 (1) ◽  
pp. 203-205 ◽  
Author(s):  
G. H. Gerber
Keyword(s):  
Host Plants ◽  
First Generation ◽  
Second Generation ◽  
Field Evaluation ◽  
Lygus Lineolaris ◽  
Suitable Host ◽  
Brassica Napus L ◽  
The Mean ◽  
New Generation ◽  
Field Plots

The relative suitability of Sinapis alba L., Sinapis arvensis L., Brassica carinata A. Braun, Brassica juncea (L.) Czern, Brassica napus L., and Brassica rapa L. as host plants for Lygus lineolaris (Palisot de Beauvois) was measured by comparing the numbers of colonizing adults (first generation), nymphs (second generation), and new-generation adults (second generation) on these species in field plots during flowering and seed development in July and August 1994. The mean numbers of first-generation adults and second-generation nymphs were not significantly different on the six species of Brassica and Sinapis. The mean number of second-generation adults differed significantly on these species, but the differences were relatively small. The results indicate that the six species of Brassica and Sinapis tested are suitable host plants of L. lineolaris and have similar levels of suitability. Key words: Insecta, Miridae, Lygus lineolaris, host plants, Brassica, Sinapis

Impact of the one-year angioscopic findings on long-term clinical events in 504 patients treated with first-generation or second-generation drug-eluting stents: the DESNOTE-X study

2019 ◽  
Vol 15 (7) ◽  
pp. 631-639 ◽  
Author(s):  
Yohei Sotomi ◽  
Satoshi Suzuki ◽  
Tomoaki Kobayashi ◽  
Yuma Hamanaka ◽  
Shimpei Nakatani ◽  
...  
Keyword(s):  
First Generation ◽  
Second Generation ◽  
Drug Eluting Stents ◽  
Clinical Events ◽  
Drug Eluting ◽  
One Year ◽  
The One

JC-virus seroconversion in multiple sclerosis patients receiving natalizumab

2013 ◽  
Vol 20 (7) ◽  
pp. 822-829 ◽  
Author(s):  
Olivier Outteryck ◽  
Hélène Zéphir ◽  
Julia Salleron ◽  
Jean-Claude Ongagna ◽  
Ana Etxeberria ◽  
...  
Keyword(s):  
Risk Factors ◽  
Multiple Sclerosis ◽  
First Generation ◽  
Second Generation ◽  
Jc Virus ◽  
Elisa Test ◽  
Enzyme Linked Immunosorbent Assay ◽  
One Year ◽  
Multiple Sclerosis Patients ◽  
Additional Value

Aim: The objectives of this study were to evaluate the rate of JC virus (JCV) seroconversion/seroreversion in a French cohort of multiple sclerosis (MS) patients receiving natalizumab (NTZ), describe the characteristics of this population, identify risk factors for JCV seropositivity and analyse the additional value of quantitative JCV serology results in this context. Methods: MS patients from two French MS centres, whose JCV serological status in 2011 while receiving NTZ was known ( n=357; first-generation enzyme-linked immunosorbent assay (ELISA) test (Gen1)), were proposed for inclusion in this study. We evaluated the rate of JCV seroconversion over a period of one year with a second-generation ELISA test (Gen2; n=303) and analysed the quantitative results. Multivariate analysis was performed to identify risk factors for JCV seropositivity. Results: Among the patients with Gen2 JCV serology ( n=303) that had been JCV-seronegative one year before ( n=165), the rate of JCV seroconversion was 26.67% (44/165). We observed a higher proportion of anti-JCV antibody seroconverters (14.5%) than expected (≤3%) but also increasing index values of anti-JCV antibody over time. Conclusion: Our data suggest that JCV reactivation occurs during NTZ therapy and leads to an increase in the anti-JCV antibodies titre, thus making them more easily detectable by the second-generation ELISA test.

scholarly journals EARLY ETHNIC LANGUAGE ACQUISITION IN MOSCOW REGION MARI DIASPORA

2021 ◽  
pp. 49-58
Author(s):  
Марина Васильевна Куцаева
Keyword(s):  
Rural Areas ◽  
First Generation ◽  
Second Generation ◽  
Moscow Region ◽  
Negative Attitudes ◽  
Ethnic Language ◽  
Or Groups ◽  
Language Strategies ◽  
Language Environment ◽  
High Level

В статье приводятся результаты социолингвистического обследования, которое проводилось автором в марийской диаспоре московского региона с целью выявления и описания функционирования этнического языка. Один из аспектов исследования посвящен вопросу межпоколенной передачи этнического языка в условиях диаспорного проживания. Респонденты первого поколения в выборке в целом демонстрируют высокий уровень языковой лояльности и уверены в том, что не утратят этнический язык, их опасения касаются скорее представителей второго поколения, выросших в московском регионе. Среди основных факторов, способствующих раннему овладению этническим языком во втором поколении, были названы следующие: погружение в языковую среду в марийской деревне летом; внутрисемейное бытовое общение на этническом языке; привлечение детей к участию в культурных мероприятиях, организованных в Москве марийским землячеством, по инициативе отдельных представителей или групп диаспоры. Однако при непосредственной реализации данные модели обнаруживают на практике ряд существенных недостатков: дальнейшая русификация марийской деревни, а значит, скудное овладение марийским; отведение ребенку роли пассивного слушателя в разговорах взрослых; отсутствие культурных форм, отвечающих запросам подростков. Заметную роль в слабой передаче детям этнического языка играют негативные аттитюды, стигматизирующие идеологии, языковые практики, унаследованные респондентами в отношении марийского языка на малой родине. В ходе обследования были зафиксированы отдельные позитивные сдвиги в этом направлении, преимущественно среди молодых респондентов, вследствие осознания ценности языка и изменения языковых стратегий и идеологий. Это важно, поскольку марийский язык является одним из основных признаков этнической идентичности в выборке: утрата во втором поколении диаспоры марийского приводит к утрате некоторых других этнических маркеров и как следствие — к размыванию границ этнической группы. The article presents the results of a sociolinguistic survey conducted by the author in the Mari diaspora of the Moscow region aimed at identifying and describing the functioning of the ethnic language. One of the aspects of the study is devoted to the issue of intergenerational transmission of the ethnic language in the conditions of diasporic residence. The first-generation respondents in the sample generally demonstrate a high level of language loyalty and are confident that they will not lose their ethnic language, their concerns are more likely to deal with to the second-generation representatives who grew up in the Moscow region. Among the main factors contributing to the early acquisition of an ethnic language in the second generation, the following ones were mentioned: immersion in the language environment in the Mari village in the summer; intra-family everyday communication in an ethnic language; children’s participation in cultural events organized in Moscow by the Mari community, as well as on the initiative of individual representatives or groups of the diaspora. However, when directly implemented, these models reveal several significant drawbacks in practice: further russification of the Mari rural areas, which leads to a child’s poor proficiency in Mari; assigning the child the role of a passive listener in the conversations of older family members; lack of cultural forms that meet the adolescents’ demands. Negative attitudes, stigmatizing ideologies as well as language practices inherited by respondents in relation to the Mari language in their small homeland all play a significant role in the weak transmission of the ethnic language to children. The survey revealed some positive changes, mainly among young respondents, due to their increased language awareness and changes in language strategies and ideologies. The Mari language is one of the main features of ethnic identity in the sample: the decay of the ethnic language in the second generation of the diaspora leads to the loss of some other ethnic markers and, as a result, to the blurring of the boundaries of the ethnic group.

scholarly journals Immunization of Rats With Cholinergic Neurons Induces Behavioral Deficits

1989 ◽  
Vol 1 (2) ◽  
pp. 63-76 ◽  
Author(s):  
Joab Chapman ◽  
Joram Feldon ◽  
Gil Alroy ◽  
Daniel M. Michaelson
Keyword(s):  
Cognitive Deficits ◽  
Short Term Memory ◽  
Cholinergic Neurons ◽  
Spatial Learning And Memory ◽  
Behavioral Deficits ◽  
Behavioral Studies ◽  
Significant Deficit ◽  
Low Levels ◽  
One Year ◽  
High Level

We have previously shown that sera from patients with Alzheimer's disease (AD) contain a significantly high level of antibodies to the cell bodies (Perikarya; PK) but not to the nerve terminals (synaptosomes) of purely cholinergic neurons from the electric fishTorpedo. In the present study we examined the effect of repeated immunization of rats with either of these antigens for one year. Immunoblot studies revealed that sera of cholinergic PK immunized rats contained a high level of antibodies to cholinergic PK proteins, in particular to a 200 kilodalton protein, to which there are specifically high levels of antibodies in AD. Sera from rats immunized with cholinergic synaptosomes and from control rats contained very low levels of these antibodies. Behavioral studies performed one year after the initial immunization revealed that the cholinergic PK immunized rats were impaired in spatial learning and memory tasks (Morris swim test and T-maze alternation) when compared to control rats and that the synaptosome-immunized rats showed no such deficit. In contrast, the three groups performed similarly in general activity, active avoidance and conditioned emotional response tests. Further experiments revealed that the cholinergic PK immunized rats displayed a significant deficit in short term memory. The association of antibodies to cholinergic neurons with Cognitive deficits in this rat model suggests that such antibodies may be involved in the pathogenesis of AD.

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