Soybean Aphid Populations on Aphid Resistant and Susceptible Soybean Lines Growing under Potassium Deficiency

cftm ◽  
2015 ◽  
Vol 1 (1) ◽  
pp. 1-6
Author(s):  
T. Michael Kates ◽  
Christina DiFonzo ◽  
Dechun Wang
Keyword(s):  
Soybean Aphid ◽  
Potassium Deficiency ◽  
Aphid Populations

scholarly journals Acquisition and Transmissibility of U.S. Soybean dwarf virus Isolates by the Soybean Aphid, Aphis glycines

Plant Disease ◽  
2011 ◽  
Vol 95 (8) ◽  
pp. 945-950 ◽  
Author(s):  
V. D. Damsteegt ◽  
A. L. Stone ◽  
M. Kuhlmann ◽  
F. E. Gildow ◽  
L. L. Domier ◽  
...  
Keyword(s):  
The United States ◽  
Aphid Species ◽  
Soybean Aphid ◽  
Aphis Glycines ◽  
Dwarf Virus ◽  
Yield Losses ◽  
Vector Specificity ◽  
Soybean Dwarf Virus ◽  
Virus Isolates ◽  
Aphid Populations

Soybean dwarf virus (SbDV) exists as several distinct strains based on symptomatology, vector specificity, and host range. Originally characterized Japanese isolates of SbDV were specifically transmitted by Aulacorthum solani. More recently, additional Japanese isolates and endemic U.S. isolates have been shown to be transmitted by several different aphid species. The soybean aphid, Aphis glycines, the only aphid that colonizes soybean, has been shown to be a very inefficient vector of some SbDV isolates from Japan and the United States. Transmission experiments have shown that the soybean aphid can transmit certain isolates of SbDV from soybean to soybean and clover species and from clover to clover and soybean with long acquisition and inoculation access periods. Although transmission of SbDV by the soybean aphid is very inefficient, the large soybean aphid populations that develop on soybean may have epidemiological potential to produce serious SbDV-induced yield losses.

Diversity and seasonal density of carabid beetles (Coleoptera: Carabidae) in relation to the soybean aphid in soybean crop in Québec, Canada

2012 ◽  
Vol 144 (4) ◽  
pp. 542-554 ◽  
Author(s):  
Annabelle Firlej ◽  
Annie-Ève Gagnon ◽  
Simon Laurin-Lemay ◽  
Jacques Brodeur
Keyword(s):  
Multivariate Analyses ◽  
Sampling Period ◽  
Soybean Aphid ◽  
Carabid Beetles ◽  
Pitfall Traps ◽  
Activity Density ◽  
Pterostichus Melanarius ◽  
Trap Catches ◽  
Field Location ◽  
Aphid Populations

AbstractWe studied the diversity and summer seasonal activity-density of Carabidae associated with soybean fields infested by the soybean aphid (Aphis glycinesMatsumura; Hemiptera: Aphididae) in Québec, Canada. Carabid beetles were sampled in six to seven fields from June to September 2004 and 2005 using pitfall traps. A total of 33 species from 15 genera were identified, with the exoticPterostichus melanarius(Illiger) (Coleoptera: Carabidae), representing 75.8% and 84.5% of all individuals trapped in 2004 and 2005, respectively. Large variations in species richness and diversity indexes were observed between fields within and between years. Multivariate analyses showed that carabid activity-density varied as a function of field location and sampling period, with individuals belonging to species overwintering as adults being more abundant early in the growing season. There was no relationship between carabid trap catches andA. glycinesdensity, suggesting that carabid beetles do not respond numerically to soybean aphid populations at the spatial scale studied.

Impact of the parasitoid Aphelinus certus on soybean aphid populations

2018 ◽  
Vol 127 ◽  
pp. 17-24 ◽  
Author(s):  
Joe M. Kaser ◽  
George E. Heimpel
Keyword(s):  
Soybean Aphid ◽  
Aphid Populations

Toward management guidelines for soybean aphid, Aphis glycines, in Quebec. II. Spatial distribution of aphid populations in commercial soybean fields

2008 ◽  
Vol 140 (2) ◽  
pp. 219-234 ◽  
Author(s):  
Marc Rhainds ◽  
Jacques Brodeur ◽  
Daniel Borcard ◽  
Pierre Legendre
Keyword(s):  
Spatial Distribution ◽  
Soybean Aphid ◽  
Aphis Glycines ◽  
Spatial Structures ◽  
Management Guidelines ◽  
Principal Coordinates ◽  
Spherical Models ◽  
Glycine Max L ◽  
Significant Patterns ◽  
Aphid Populations

AbstractThe study was conducted to document the spatial distribution of the soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), in commercial fields of soybean, Glycine max (L.) Merr. The abundance of aphids was assessed weekly at 12 sites in 2005 and 2006 on more than 135 georeferenced plants per site. Variograms and principal coordinates of neighbour matrices (PCNM) were used to detect significant spatial structures. Variograms indicated a spatially random distribution of aphid populations in a majority (84%) of fields-weeks. For the variograms with a defined structure, the variance between pairs of observations generally increased rapidly with the distance between plants up to a distance where it stabilized, a pattern adequately fitted by spherical models. Structured spatial distributions were more prevalent in 2005 than in 2006, especially at the end of the season. In 2006, PCNM analysis was more sensitive in detecting spatial trends than were variograms. PCNM analysis revealed significant patterns across a broad range of scales, with dominant periods averaging 22.6 and 47.1 m for the short and long transects, respectively. Sampling plants along a 100 m long transect at about 7.5 m intervals in soybean fields would allow detection of the spatial structures identified in this study.

Relationships between soybean shoot nitrogen components and soybean aphid populations

2013 ◽  
Vol 7 (6) ◽  
pp. 667-676 ◽  
Author(s):  
Walter E. Riedell ◽  
Eric A. Beckendorf ◽  
Michael A. Catangui
Keyword(s):  
Soybean Aphid ◽  
Aphid Populations

Detection of Stress Induced by Soybean Aphid (Hemiptera: Aphididae) Using Multispectral Imagery from Unmanned Aerial Vehicles

2019 ◽  
Vol 113 (2) ◽  
pp. 779-786 ◽  
Author(s):  
Zachary P D Marston ◽  
Theresa M Cira ◽  
Erin W Hodgson ◽  
Joseph F Knight ◽  
Ian V Macrae ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Open Field ◽  
Near Infrared ◽  
Field Trials ◽  
Soybean Aphid ◽  
Multispectral Imagery ◽  
Near Infrared Reflectance ◽  
Aerial Vehicles ◽  
Induced Stress ◽  
Aphid Populations

Abstract Soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is a common pest of soybean, Glycine max (L.) Merrill (Fabales: Fabaceae), in North America requiring frequent scouting as part of an integrated pest management plan. Current scouting methods are time consuming and provide incomplete coverage of soybean. Unmanned aerial vehicles (UAVs) are capable of collecting high-resolution imagery that offer more detailed coverage in agricultural fields than traditional scouting methods. Recently, it was documented that changes to the spectral reflectance of soybean canopies caused by aphid-induced stress could be detected from ground-based sensors; however, it remained unknown whether these changes could also be detected from UAV-based sensors. Small-plot trials were conducted in 2017 and 2018 where cages were used to manipulate aphid populations. Additional open-field trials were conducted in 2018 where insecticides were used to create a gradient of aphid pressure. Whole-plant soybean aphid densities were recorded along with UAV-based multispectral imagery. Simple linear regressions were used to determine whether UAV-based multispectral reflectance was associated with aphid populations. Our findings indicate that near-infrared reflectance decreased with increasing soybean aphid populations in caged trials when cumulative aphid days surpassed the economic injury level, and in open-field trials when soybean aphid populations were above the economic threshold. These findings provide the first documentation of soybean aphid-induced stress being detected from UAV-based multispectral imagery and advance the use of UAVs for remote scouting of soybean aphid and other field crop pests.

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