Characterization of Plant Damage Caused by Russian Wheat Aphid (Homoptera: Aphididae)

1992 ◽  
Vol 85 (5) ◽  
pp. 2017-2022 ◽  
Author(s):  
John D. Burd ◽  
Robert L. Burton
Keyword(s):  
Russian Wheat Aphid ◽  
Plant Damage

scholarly journals Molecular characterization of Russian wheat aphid consumption by spiders in winter wheat

2012 ◽  
Vol 40 (1) ◽  
pp. 71-77 ◽  
Author(s):  
Lauren M. Kerzicnik ◽  
Eric G. Chapman ◽  
James D. Harwood ◽  
Frank B. Peairs ◽  
Paula E. Cushing
Keyword(s):  
Winter Wheat ◽  
Molecular Characterization ◽  
Russian Wheat Aphid ◽  
Aphid Consumption

scholarly journals Development and Characterization of Wheat Germplasm with Combined Resistance to Russian Wheat Aphid and Stem Rust (Race “Ug99”) in Kenya

2013 ◽  
Vol 04 (04) ◽  
pp. 767-773 ◽  
Author(s):  
Fredrick O. Amulaka ◽  
Joyce N. Maling’a ◽  
Mehmet Cakir ◽  
Richard M. S. Mulwa
Keyword(s):  
Stem Rust ◽  
Russian Wheat Aphid ◽  
Wheat Germplasm

scholarly journals Characterization of Eight Russian Wheat Aphid (Hemiptera: Aphididae) Biotypes Using Two-Category Resistant-Susceptible Plant Responses

2014 ◽  
Vol 107 (3) ◽  
pp. 1274-1283 ◽  
Author(s):  
G. J. Puterka ◽  
S. J. Nicholson ◽  
M. J. Brown ◽  
W. R. Cooper ◽  
F. B. Peairs ◽  
...  
Keyword(s):  
Russian Wheat Aphid ◽  
Plant Responses ◽  
Susceptible Plant

Plant Damage and Yield Response to the Russian Wheat Aphid (Homoptera: Aphididae) on Susceptible and Resistant Winter Wheats in Colorado

2003 ◽  
Vol 96 (2) ◽  
pp. 352-360 ◽  
Author(s):  
Terri L. Randolph ◽  
Frank B. Peairs ◽  
Mary K. Kroening ◽  
John S. Armstrong ◽  
Robert W. Hammon ◽  
...  
Keyword(s):  
Russian Wheat Aphid ◽  
Yield Response ◽  
Plant Damage

Wheat Genotype, Early Plant Growth Stage and Infestation Density Effects on Russian Wheat Aphid (Homoptera: Aphididae) Population Increase and Plant Damage

2000 ◽  
Vol 35 (1) ◽  
pp. 22-38 ◽  
Author(s):  
Nilsa A. Bosque-Pérez ◽  
Dennis J. Schotzko
Keyword(s):  
Plant Growth ◽  
Growth Stage ◽  
Initial Density ◽  
Russian Wheat Aphid ◽  
Reproductive Rate ◽  
Diuraphis Noxia ◽  
Population Increase ◽  
Growth Stages ◽  
Plant Damage ◽  
Aphid Density

Population increase of the Russian wheat aphid, Diuraphis noxia (Mordvilko) (Homoptera: Aphididae), and its effect on early plant growth and damage were studied under laboratory conditions on two winter wheat genotypes, susceptible ‘Stephens’ and resistant 10085-5. Three early plant growth stages (one-, two-, and three-leaf stage), and three insect densities (0, 5 and 20 aphids per plant) were compared. Insect counts, plant damage assessments, plant height, leaf number and dry weight measurements were made. Diuraphis noxia population increase was greater on ‘Stephens’ than on 10085-5, but this was highly influenced by plant growth stage at time of infestation and initial aphid density. Host quality of ‘Stephens’ decreased rapidly when plants were infested at the 1 -left stage, especially with the high initial density (20 aphids), resulting in low aphid population increase. For all plant developmental stages and genotypes, D. noxia per capita population increase was lower at initial densities of 20 compared to 5 aphids per plant, probably due to a density-dependent reduction in reproductive rate associated with a reduction in host-plant quality and/or crowding. Diuraphis noxia significantly affected plant growth, but the magnitude of the effect was influenced by genotype. In general, susceptible ‘Stephens’ had significantly more damage and a greater reduction in growth than resistant 10085-5.

Characterization of Russian Wheat Aphid Resistance in a Hard White Spring Wheat

Crop Science ◽  
1992 ◽  
Vol 32 (6) ◽  
pp. 1442-1446 ◽  
Author(s):  
Cheryl A. Baker ◽  
James A. Webster ◽  
David R. Porter
Keyword(s):  
Spring Wheat ◽  
Russian Wheat Aphid ◽  
Aphid Resistance

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

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