Host selection by parasitic Allothrombium ovatum larvae (Acari: Trombidiidae) and mite-aphid population dynamics on cotton, wheat and rape

1998 ◽  
Vol 3 (0) ◽  
pp. 97
Author(s):  
Yincai Dong ◽  
Jinian Feng ◽  
Zhi-Qiang Zhang
Keyword(s):  
Population Dynamics ◽  
Host Selection ◽  
Aphid Population

The Migratory Ambit of the Hop Aphid and its Significance in Aphid Population Dynamics

10.2307/4207 ◽  
1979 ◽  
Vol 48 (3) ◽  
pp. 955 ◽  
Author(s):  
L. R. Taylor ◽  
I. P. Woiwod ◽  
R. A. J. Taylor
Keyword(s):  
Population Dynamics ◽  
Aphid Population

The role of large-scale spatially explicit and small-scale localized processes on the population dynamics of cereal aphids

2005 ◽  
Vol 95 (6) ◽  
pp. 579-587 ◽  
Author(s):  
L. Winder ◽  
G.J.K. Griffiths ◽  
J.N. Perry ◽  
C.J. Alexander ◽  
J.M. Holland ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Spatial Pattern ◽  
Large Scale ◽  
Aphid Population ◽  
Small Scale ◽  
Spatially Explicit ◽  
Cereal Aphids ◽  
Field Scale ◽  
Crop Density ◽  
Activity Density

AbstractA field-scale study of the spatially explicit interaction between the carabid Poecilus cupreus Linnaeus, and two common aphid species (Sitobion avenae (Fabricius) and Metopolophium dirhodum (Walker)) in winter wheat was conducted. All three species showed considerable spatial pattern at the field scale. Activity-density of P. cupreus was an order of magnitude higher in the central part of the field compared to its periphery. Where P. cupreus activity-density was highest, S. avenae and M. dirhodum population peaks were delayed. Additionally, in the case of M. dirhodum, lower maximum counts were evident where P. cupreus activity-density was highest. An analysis of the movement of individual P. cupreus using release–recapture indicated that those beetles within the centre of the field exhibited reduced displacement, which may have caused the generation or maintenance of spatial pattern. Crop density was also measured throughout the field. Although crop density had no large-scale spatial pattern, its variability at the small-scale was consistent with an influence on aphid population dynamics. This study demonstrates empirically that both large-scale spatially explicit and small-scale localized processes influenced aphid population dynamics simultaneously.

Population dynamics of Aphis craccivora (Koch) and its natural enemies on bean crop in relation to weather parameters in Vadodara, Gujarat, India

2016 ◽  
Author(s):  
Ruchika Kataria ◽  
Dolly Kumar
Keyword(s):  
Population Dynamics ◽  
High Temperature ◽  
Aphis Craccivora ◽  
Aphid Population ◽  
Agricultural Fields ◽  
Biotic Factors ◽  
Aphis Craccivora Koch ◽  
Weather Parameters ◽  
Abiotic And Biotic Factors ◽  
Bean Crop

The studies on the population dynamics of Aphis craccivora (Koch) were conducted during 2008-2011. This pest is a serious pest in the agricultural fields of Vadodara, India. The results showed that the aphid population was higher in the month of September to January on bean crop. The maximum population of Aphis craccivora (Koch) was seen in the month of January to March. The correlation of the aphid population was done with abiotic and biotic factors. The aphid population was showing positive correlation with high temperature and the population of predators and other associated insect was showing negative correlation with minimum temperature, relative humidity and rainfall. Hence the information contained in this paper lead to the identification of the proper integrated pest management (IPM) practises for Aphis craccivora (Koch) management.

scholarly journals Plant genotypic diversity increases population size of a herbivorous insect

2011 ◽  
Vol 278 (1721) ◽  
pp. 3108-3115 ◽  
Author(s):  
Shunsuke Utsumi ◽  
Yoshino Ando ◽  
Timothy P. Craig ◽  
Takayuki Ohgushi
Keyword(s):  
Population Dynamics ◽  
Population Size ◽  
Natural Enemy ◽  
Genotypic Variation ◽  
Genotypic Diversity ◽  
Community Genetics ◽  
Aphid Population ◽  
Herbivorous Insect ◽  
Mixed Genotype ◽  
The Impact

It is critical to incorporate the process of population dynamics into community genetics studies to identify the mechanisms of the linkage between host plant genetics and associated communities. We studied the effects of plant genotypic diversity of tall goldenrod Solidago altissima on the population dynamics of the aphid Uroleucon nigrotuberculatum . We found genotypic variation in plant resistance to the aphid in our experiments. To determine the impact of plant genotypic diversity on aphid population dynamics, we compared aphid densities under conditions of three treatments: single-genotype plots, mixed-genotype plots and mixed-genotype-with-cages plots. In the latter treatment plants were individually caged to prevent natural enemy attack and aphid movement among plants. The synergistic effects of genotypes on population size were demonstrated by the greater aphid population size in the mixed-genotype treatment than expected from additive effects alone. Two non-exclusive hypotheses are proposed to explain this pattern. First, there is a source–sink relationship among plant genotypes: aphids move from plant genotypes where their reproduction is high to genotypes where their reproduction is low. Second, natural enemy mortality is reduced in mixed plots in a matrix of diverse plant genotypes.

Experimental small-scale grassland fragmentation alters aphid population dynamics

Oikos ◽  
2003 ◽  
Vol 100 (3) ◽  
pp. 581-591 ◽  
Author(s):  
Brigitte Braschler ◽  
Gerolf Lampel ◽  
Bruno Baur
Keyword(s):  
Population Dynamics ◽  
Aphid Population ◽  
Small Scale

Development of a wheat aphid population dynamics model based on cusp catastrophe theory

2020 ◽  
pp. 2050078
Author(s):  
Yuan Li ◽  
Zhen Li ◽  
Lichun Zhao ◽  
Zuqing Hu ◽  
Huiyan Zhao
Keyword(s):  
Population Dynamics ◽  
Management Strategies ◽  
Dynamic Control ◽  
Aphid Population ◽  
Cusp Catastrophe ◽  
Dynamics Model ◽  
Catastrophe Model ◽  
Cusp Catastrophe Model ◽  
Population Dynamics Model ◽  
Control Threshold

Aphids are a major global wheat pest that can cause considerable loss of yield. Modeling of aphid population dynamics is an integral part of management strategies to manage or control aphid populations. In this paper, first, a wheat aphid population dynamics model was developed based on a logistic model and the Holling III functional response, which includes three factors: temperature, natural enemies and insecticide. Second, this model fitted with a cusp catastrophe model to describe how abrupt changes in the wheat aphid population were influenced by these factors. Finally, the system was validated with field data from 2016 to 2018. The bifurcation set of the cusp catastrophe model was deemed to be the quantified dynamic control threshold, so an outbreak of aphid’s population can be explained according to the variation of control variables. In short, this aphid population model was successfully validated on survey data, which can be used to guide the prevention and control of aphids.

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