Effects of Orchard Ground Cover and Mite Management Options on the Population Dynamics of European Red Mite (Acari: Tetranychidae) and Amblyseius fallacis (Acari: Phytoseiidae) in Apple

1997 ◽  
Vol 90 (2) ◽  
pp. 595-603 ◽  
Author(s):  
Michael J. Stanyard ◽  
Rick E. Foster ◽  
Timothy J. Gibb
Keyword(s):  
Population Dynamics ◽  
Ground Cover ◽  
Management Options ◽  
Amblyseius Fallacis ◽  
European Red Mite

scholarly journals Population Dynamics and Possible Management Options for the Rock Dassie Procavia capensis Population in the Tsitsikamma Coastal National Park

Koedoe ◽  
1987 ◽  
Vol 30 (1) ◽  
Author(s):  
N. Fairall ◽  
N. Hanekom
Keyword(s):  
Population Dynamics ◽  
Simulation Model ◽  
National Park ◽  
Management Strategies ◽  
Management Options ◽  
Simple Simulation ◽  
Demographic Study ◽  
Procavia Capensis

A demographic study of the rock dassie population in the Tsitsikamma Coastal National Park rest camp has provided data that is used to construct a simple simulation model and it is applied to evaluate different management strategies for the rock dassie population.

Incorporating Uncertainty into Fishery Models

2002 ◽  
Keyword(s):  
Population Dynamics ◽  
Parameter Uncertainty ◽  
Model Uncertainty ◽  
Oncorhynchus Tshawytscha ◽  
Population Abundance ◽  
Management Options ◽  
Population Survival ◽  
Model Parameter Uncertainty ◽  
Recruitment Model ◽  
The Bayesian Approach

<em>Abstract.—</em>Spring and summer chinook salmon <em>Oncorhynchus tshawytscha </em>populations of the Snake River basin provide the setting for an application of Bayesian analysis to derive risks of population survival and recovery for these endangered populations. The Bayesian approach is appealing because it provides a theoretical framework within which uncertainty about population dynamics is directly translated into measures of probability of achieving various population abundance targets, given certain types of actions in the future. Uncertainty about parameters governing the population dynamics is based on an application of the Bayes Theorem to the likelihood of observations about past recruitment, as viewed in the context of a generalized Ricker spawner and recruitment model. Uncertainty about future dynamics is based on simulations of population abundance over the next 100 years, and they contain both model parameter uncertainty and annual stochastic elements affecting survival. Results show substantial reductions in mortality rate (on the order of 0.5–0.7 per year, as compared with rates in recent years) are required in order for the populations to meet recovery and survival standards set for the next 48– 100 years. The level of mortality reduction needed to achieve these standards can assist in guiding potential hydropower system management options.

COMPARISONS BETWEEN AN EXOTIC AND AN ENDEMIC PHYTOSEIID MITE PREDATOR (ACARINA: PHYTOSEIIDAE) IN BRITISH COLUMBIA

1974 ◽  
Vol 106 (7) ◽  
pp. 773-776 ◽  
Author(s):  
R. S. Downing ◽  
T. K. Moilliet
Keyword(s):  
British Columbia ◽  
Resistant Strain ◽  
Panonychus Ulmi ◽  
Phytoseiid Mite ◽  
Population Densities ◽  
Amblyseius Fallacis ◽  
European Red Mite ◽  
Mite Predator ◽  
Phytoseiid Predator

AbstractIn 1972, an organophosphate resistant strain of the phytoseiid predator Amblyseius fallacis (Garman) from Michigan compared favourably with the endemic Typhlodromus occidentalis Nesbitt, from Summerland, B.C., in laboratory and greenhouse trials against European red mite, Panonychus ulmi (Koch), and was later released into an orchard. By August 1972, A. fallacis had decreased whereas population densities of T. occidentalis increased. Examination of leaves and bark from the trees, and weeds, grass, and litter beneath the trees in 1973 confirmed that A. fallacis failed to survive in the Okanagan environment.

scholarly journals Defining Integrated Weed Management: A Novel Conceptual Framework for Models

Agronomy ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 747
Author(s):  
Jonathan Storkey ◽  
Joseph Helps ◽  
Richard Hull ◽  
Alice E. Milne ◽  
Helen Metcalfe
Keyword(s):  
Population Dynamics ◽  
Conceptual Framework ◽  
Herbicide Resistance ◽  
Weed Management ◽  
Integrated Weed Management ◽  
Management Options ◽  
Weed Population ◽  
Weed Population Dynamics ◽  
Population Dynamics Models ◽  
Dynamics Models

Weed population dynamics models are an important tool for predicting the outcome of alternative Integrated Weed Management (IWM) scenarios. The growing problem of herbicide resistance has increased the urgency for these tools in the design of sustainable IWM solutions. We developed a conceptual framework for defining IWM as a standardised input template to allow output from different models to be compared and to design IWM scenarios. The framework could also be used as a quantitative metric to determine whether more diverse systems are more sustainable and less vulnerable to herbicide resistance using empirical data. Using the logic of object-oriented programming, we defined four classes of weed management options based on the stage in the weed life cycle that they impact and processes that mediate their effects. Objects in the same class share a common set of properties that determine their behaviour in weed population dynamics models. Any weed control “event” in a system is associated with an object, meaning alternative management scenarios can be built by systematically adding events to a model either to compare existing systems or design novel approaches. Our framework is designed to be generic, allowing IWM systems from different cropping systems and countries to be compared.

SIMULATION MODEL OF EUROPEAN RED MITE POPULATION DYNAMICS DEVELOPED FOR A MINI-COMPUTER

1979 ◽  
Vol 111 (4) ◽  
pp. 499-507 ◽  
Author(s):  
D. C. Herne ◽  
C. T. Lund
Keyword(s):  
Population Dynamics ◽  
Simulation Model ◽  
Control Strategies ◽  
Panonychus Ulmi ◽  
Factors Affecting ◽  
European Red Mite ◽  
Dynamics And Control ◽  
Population Component ◽  
Normal Probability Distribution ◽  
Log Normal

AbstractA simulation model is described for the population dynamics of the European red mite, Panonychus ulmi (Koch). The model incorporates the following features: (a) development rate is dependent on effective daily temperature; (b) division of each population component into distinct daily age classes; (c) emergence of individuals from each population component is dependent on a log-normal probability distribution, and a temperature related development vector to accumulate a measure of the temperature effect on development. Validation runs on a mini-computer in 1976 and 1977 adequately described actual population curves determined from daily orchard sampling. A model of this type which can be used with small computers should prove useful in investigating the main factors affecting the population dynamics, and control strategies for this and other pests.

SAMPLING THE DENSITY AND DISTRIBUTION OF AMBLYSEIUS FALLACIS (ACARINA: PHYTOSEIIDAE) IN THE GROUND COVER OF MICHIGAN APPLE ORCHARDS

1978 ◽  
Vol 110 (8) ◽  
pp. 785-794 ◽  
Author(s):  
D. L. McGroarty ◽  
B. A. Croft
Keyword(s):  
Extraction Method ◽  
Sampling Methods ◽  
Ground Cover ◽  
Practical Method ◽  
Tree Canopy ◽  
Apple Orchards ◽  
Density Estimates ◽  
Amblyseius Fallacis ◽  
Sample Technique ◽  
Parthenocissus Quinquefolia

AbstractAn extraction method, timed counts taken from broadleafed forbs, and counts taken on apple sucker leaves were evaluated as sampling methods to estimate populations of the predatory phytoseiid mite Amblyseius fallacis Garman in the ground cover of commercial apple orchards. All three gave comparable density estimates at moderate and high population levels. The extraction sample technique was most effective in measuring low population densities, however the timed vegetational procedure was deemed the most practical method for monitoring these mites for pest management purposes. With respect to predator distribution in the ground cover, mites were aggregated somewhat in the heterogeneous understory, but were almost randomly distributed on apple sucker leaves. Predators were equally likely to find prey irrespective of location beneath the tree canopy. They showed little preference for different plant species with the exception of a higher incidence than expected on apple (Malus) and possibly on grape (Vitus sp.) and Virginia creeper (Parthenocissus quinquefolia).

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