FIELD EVALUATION AND THE IMPORTANCE OF THE ASCOCHYTA COMPLEX ON PEAS

1965 ◽  
Vol 45 (1) ◽  
pp. 27-33 ◽  
Author(s):  
V. R. Wallen
Keyword(s):  
Seed Germination ◽  
Secondary Infection ◽  
Field Evaluation ◽  
Mycosphaerella Pinodes ◽  
Relative Importance ◽  
Seed Infection ◽  
Yield Losses ◽  
Preliminary Results ◽  
The Past ◽  
Ascochyta Pisi

Mycosphaerella pinodes Berk, and Blox. Vestgrn. and Ascochyta pinodella Jones were found to cause serious yield losses in the field. Although a higher percentage of seeds became infected with Ascochyta pisi Lib. than with either of the fungi referred to above, yield losses were considerably less, This finding is important in setting disease tolerances for various grades of seed since in the past arbitrary scales for these three organisms have been set without any knowledge of the relative importance of seed infection to field epidemiology. Only races III and IV of A. pisi caused significant losses in yield. Cycloheximide (100 p.p.m.) applied as a spray in the field significantly reduced seed infection by A. pisi but also reduced seed germination. Phygon 50W and griseofulvin 50W did not reduce germination but reduced seed infection considerably although not completely. Granted, preliminary results suggested that certain chemicals gave a selective control of the races of A. pisi, but this phenomenon could not be further demonstrated because of secondary infection in the field.

Importance of seed-borne inoculum in the etiology of the Ascochyta blight complex of field peas (Pisum sativum L.) grown in Victoria

1995 ◽  
Vol 35 (4) ◽  
pp. 525 ◽  
Author(s):  
TW Bretag ◽  
TV Price ◽  
PJ Keane
Keyword(s):  
Pisum Sativum ◽  
Ascochyta Blight ◽  
Mycosphaerella Pinodes ◽  
Seed Infection ◽  
Seeding Rate ◽  
Pisum Sativum L ◽  
Field Peas ◽  
Ascochyta Pisi ◽  
Growing Region ◽  
Seed Infestation

Fungi associated with the ascochyta blight complex of field peas were isolated from 436 of 691 seedlots tested. Of the fungi detected, 94.8% of isolates were Mycosphaerella pinodes, 4.2% Phoma medicaginis, and 1.0% Ascochyta pisi. The levels of infestation of seed varied considerably from year to year and between seedlots, depending on the amount of rainfall between flowering and maturity. Within a particular pea-growing region, the level of seed-borne infection was often highest in seed from crops harvested latest. In addition, crops sown early were usually more severely affected by disease than late-sown crops, and this resulted in higher levels of seed infection. There was no correlation between the level of seed infestation by M. pinodes and the severity of ascochyta blight; however, where the level of seed infection was high (>11%) there was a significant reduction in emergence, which caused a reduction in grain yield. It may therefore be possible to use seed with high levels of seed-borne ascochyta blight fungi, provided the seeding rate is increased to compensate for poor emergence.

scholarly journals The pathogenicity and importance of seed-borne infection by Bipolaris sorokiniana on barley in Finland

1985 ◽  
Vol 57 (2) ◽  
pp. 107-115
Author(s):  
Aarne Kurppa
Keyword(s):  
Seed Treatment ◽  
Field Experiments ◽  
Secondary Infection ◽  
Severe Disease ◽  
Weather Conditions ◽  
Bipolaris Sorokiniana ◽  
Seed Infection ◽  
Yield Losses ◽  
Growing Seasons ◽  
Sowing Seed

Seed-borne infection by Bipolaris sorokiniana decreased the percentage germination of barley seeds and the emergence of seedlings. Infection levels were higher in non-germinated than in germinated seeds. Seed treatment with organomercurial fungicide or imazalil improved the percentage emergence but a low number of diseased seedlings still remained in the crops. The fungus caused a reduction in grain yields in most experiments and also decreased their value as sowing seed, if the weather conditions were favourable for compute disease expression. Yield losses in greenhouse experiments varied from 7.2 to 38.5 % and in the field from 5 to 11 %, and showed a strong correlation with the infection levels in the seed stocks. Higher losses were associated with the six-row cultivars. Organomercury seed treatment resulted in a slight but in significant increase in yields but it was able to prevent an occurrence of secondary infection in the crop resulting in a lower seed infection levels of the grain. In field experiments in Inari (69° N.L.) seed-borne inoculum could be demonstrated clearly to be the only source of a severe disease outbreak. The inoculum remaining in the soil was capable of initiating soil-borne infection of barley seedlings during the following two growing seasons.

Granular bainite or granular ferrite? A preliminary TEM investigation of an HSLA-100 steel

1991 ◽  
Vol 49 ◽  
pp. 584-585
Author(s):  
R. Varughese ◽  
S. W. Thompson ◽  
P. R. Howell
Keyword(s):  
Room Temperature ◽  
Transformation Products ◽  
Accurate Description ◽  
Granular Bainite ◽  
Preliminary Results ◽  
The Past ◽  
Light Micrograph ◽  
Multiphase Reaction ◽  
Detailed Nature

Ever since Habraken and Economopoulos first employed the term granular bainite to classify certain unconventional transformation products in continuously cooled steels, the term has been widely accepted and used, despite the lack of a clear consensus as to the detailed nature of the transformation products which constitute granular bainite. This paper presents the preliminary results of a TEM investigation of an 0.04 wt% C, copper-containing steel (designated HSLA-100). It is suggested that the term granular ferrite rather than granular bainite is a more accurate description of this multiphase reaction product.Figure 1 is a light micrograph of a sample which had been air-cooled from 900°C to room temperature. The microstructure is typical of that which has been termed granular bainite in the past and appears to consist of equiaxed ferritic grains together with other minor transformation products. In order to examine these structures in more detail, both continuously cooled and isothermally transformed and quenched materials have been examined with TEM. Granular bainite has been found in virtually all samples.

Measuring the Selective Utilization of Animal Species by Prehistoric Human Populations

1979 ◽  
Vol 44 (1) ◽  
pp. 155-160 ◽  
Author(s):  
Bruce D. Smith
Keyword(s):  
Animal Species ◽  
Human Populations ◽  
Relative Importance ◽  
The Past

To determine the pattern of selective utilization of animal species by prehistoric human populations, it is first necessary to quantify the relative importance of species of animals in the diet of prehistoric human groups through analysis of archaeologically recovered faunal samples. These values are then compared with estimates of the relative availability of different species of animals in the environment. Such estimates of the relative availability of animal species in prehistoric habitat situations, usually quantified in terms of biomass, are obtained by projecting data from modern analog situations into the past. When attempting to reconstruct prehistoric biotic communities in this manner, it is important to be aware of a number of possible sources of bias and to evaluate and apply modern wildlife data according to a set of interrelated principles. Sources of bias and criteria for selecting modern wildlife analog data are discussed.

A benchmarking approach to the progress of green materials and systems’ use in the UAE construction industry

2016 ◽  
Vol 13 (4) ◽  
pp. 315-327 ◽  
Author(s):  
Aly Elgayar ◽  
Salwa Mamoun Beheiry ◽  
Alaa Jabbar ◽  
Hamad Al Ansari
Keyword(s):  
Construction Industry ◽  
United Arab Emirates ◽  
Design Methodology ◽  
Construction Materials ◽  
Relative Importance ◽  
Content Type ◽  
The Past ◽  
Green Materials ◽  
Importance Index ◽  
Regulatory Guidelines

Purpose Over the past decade, the United Arab Emirates (UAE) introduced several green regulatory guidelines, federal decrees, and a considerable number of environmentally friendly initiatives. Hence, the purpose of this paper is to investigate the top green materials and systems used currently in the UAE construction industry as per the new laws dictate as well as see if professionals are switching over to incorporate more green materials, systems, and/or designs. Design/methodology/approach The work involved reviewing internationally popular green materials and systems for construction, developing a questionnaire based on the literature review, surveying professionals in the seven UAE emirates, and ranking the findings based on the relative importance index. Findings Findings found the top used green materials and system in the UAE’s construction industry. As well as identified that there is a communication gap between the design and implementation phases that is possibly hindering the use of more green materials and systems. Originality/value This study sets a baseline to measure the UAE’s progress over the coming years in terms of integrating more green construction materials, systems, methodologies, and trends.

Pathogenicity of postfire ascomycetes (Pezizales) on seeds and germinants of lodgepole pine

1986 ◽  
Vol 64 (10) ◽  
pp. 2368-2371 ◽  
Author(s):  
Keith N. Egger ◽  
J. W. Paden
Keyword(s):  
Seed Germination ◽  
Botrytis Cinerea ◽  
Pinus Contorta ◽  
Lodgepole Pine ◽  
Seed Infection

Forty isolates of postfire ascomycetes (Pezizales) were tested for in vitro pathogenicity on seeds and germinants of lodgepole pine, Pinus contorta Dougl. Two known pathogens, Caloscypha fulgens (Pers.) Boud. and Botrytis cinerea Pers., were included as a check of the method. Caloscypha fulgens was the only fungus that caused serious declines in seed germination, although several species of postfire Pezizales were capable of preemergence seed infection. Rhizina undulata Fr. and Pyropyxis rubra (Peck) Egger were strongly pathogenic on germinants. Pyropyxis rubra was not previously known to be pathogenic. Many isolates were weakly pathogenic on germinants under the conditions tested.

The Rise of Behavioral Economics: A Quantitative Assessment

2017 ◽  
Vol 41 (3) ◽  
pp. 555-583 ◽  
Author(s):  
Niels Geiger
Keyword(s):  
Behavioral Economics ◽  
Quantitative Assessment ◽  
Relative Importance ◽  
Main Research ◽  
Academic Literature ◽  
The Past ◽  
Short Summary ◽  
History Of ◽  
Research Goal

This article is devoted to the issue of operationalizing and empirically measuring the development of behavioral economics, focusing on trends in the academic literature. The main research goal is to provide a quantitative, bibliometric assessment to answer the question of whether the relative importance of behavioral economics has increased over the past decades. After an introduction and a short summary of the history of behavioral economics, several studies are laid out and evaluated. The results generally provide a quantitative confirmation of the story of a rise of behavioral economics that can be found in the literature, and add some notable additional insights.

Synchrotron radiation from single electrons gyrating in a magnetoactive plasma

1969 ◽  
Vol 47 (7) ◽  
pp. 757-768 ◽  
Author(s):  
P. C. W. Fung
Keyword(s):  
Synchrotron Radiation ◽  
Plasma Frequency ◽  
Radiation Power ◽  
Magnetoactive Plasma ◽  
Electron Plasma ◽  
Relativistic Electrons ◽  
Relative Importance ◽  
Numerical Examples ◽  
The Past ◽  
Single Electrons

In this paper, the incoherent synchrotron radiation power emitted by relativistic electrons gyrating in a cold magnetoactive plasma is rederived, correcting errors which have occurred in the past literature. One can specify the background plasma by the quantity A = ωp2/ωH2 (ωp is the angular electron plasma frequency and ωH is the angular electron gyro-frequency), i.e. the relative importance of the plasma frequency to the gyro-frequency. The general spectral features of synchrotron radiation from single electrons radiating in plasmas of large [Formula: see text] and small [Formula: see text] are discussed with the aid of a number of numerical examples.

Cartilage Scales Embedded in Fibrin Gel

2017 ◽  
Vol 33 (02) ◽  
pp. 225-232 ◽  
Author(s):  
Milos Kovacevic ◽  
Frank Riedel ◽  
Jochen Wurm ◽  
Gregor Bran
Keyword(s):  
Regenerative Medicine ◽  
Surgical Techniques ◽  
Fibrin Gel ◽  
Platelet Rich Fibrin ◽  
Preliminary Results ◽  
Advantages And Disadvantages ◽  
The Past ◽  
Dorsal Nasal Augmentation ◽  
Diced Cartilage ◽  
Nasal Augmentation

Multiple techniques have been described for dorsal nasal augmentation in rhinoplasty. In this article, we review common surgical techniques for raising the dorsum or eliminating dorsal irregularities, by highlighting inherent advantages and disadvantages of each method. Within the past few years, the use of diced cartilage grafts has become the workhorse in this field of interest. To overcome drawbacks of methods based on diced cartilage, we present a new concept for autologous augmentation, using regenerative medicine protocols. A mix of cartilage scales with cartilage pâté was embedded in platelet-rich fibrin (PRF). Since December 2015, a total of 48 patients were treated with this technique. Based on our preliminary results, cartilage scales in PRF appear to be a promising and reliable alternative to existing procedures for dorsal nasal augmentation.

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