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Sunday, August 2, 2020 | History

2 edition of Computer simulations of Green Spruce aphid populations. found in the catalog.

Computer simulations of Green Spruce aphid populations.

Stephen John Crute

Computer simulations of Green Spruce aphid populations.

by Stephen John Crute

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  • 20 Currently reading

Published by The Author] in [s.l .
Written in English


Edition Notes

Thesis (D. Phil. ) - University of Ulster, 1990.

The Physical Object
Pagination[vii], 132, [16]p., tables :
Number of Pages132
ID Numbers
Open LibraryOL13937583M

The material and content contained in the Greenbook label database is for general use information only. Agworld and Greenbook do not provide any guarantee or assurance that the in. The removal of sap creates a lack of vigour in the plant, and aphid saliva is toxic to plants. Aphids frequently transmit plant viruses to their hosts, such as to potatoes, cereals, sugarbeets, and citrus plants. The green peach aphid, Myzus persicae, is a vector for more than plant viruses.

The cotton aphid is known to transmit more than 50 plant viruses, and the green peach aphid more than Monitoring Population Levels. Aphid populations are best monitored by routine (once or twice a week) visual inspections of plants that are potential hosts. Aphids can occur anywhere on the plants, but they are often found on the underside. Elatobium abietinum, commonly known as the spruce aphid or green spruce aphid, is a species of aphid in the subfamily Aphidinae that feeds on spruce (Picea spp.), and occasionally fir (Abies) is native to Northern, Central and Eastern Europe and has .

Sift through the debris and count the tiny green aphids. If you find less than 5 aphids per sample, you don’t need to take action but check again in a week or two just to make sure populations. During observations in a spruce forest in Cumbria, England, that had had a severe natural outbreak of this aphid leading to complete defoliation of some trees in , leading shoots developed on the defoliated trees but were much shorter than those on uninfested ones, and even in shoot growth was slow, representing a 61% growth loss.


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Computer simulations of Green Spruce aphid populations by Stephen John Crute Download PDF EPUB FB2

1 Seasonal changes in the distribution of green spruce aphid Elatobium abietinum (Walker) within the canopy of 20–25‐year‐old Sitka spruce are described based on data from two low‐altitude sites (– m above sea‐level), two mid‐altitude sites (– m a.s.l) and one high‐altitude site ( m a.s.l).

2 Aphids were counted throughout the canopy on shoots representative Cited by: Computer simulations of green spruce aphid populations. Author: Crute, Stephen John. CHAPTER 17 PLANT VIRUS EPIDEMIOLOGY AND COMPUTER SIMULATION OF APHID POPULATIONS B.

Frazer Agriculture Canada Computer simulations of Green Spruce aphid populations. book Station Vancouver, British Columbia Canada INTRODUCTION APPROACHES TO AN EPIDEMIOLOGY OF PLANT VIRUS DISEASES COMPUTER SIMULATION MODELS OF APHID POPULATION DYNAMICS A Basic Model Review of Aphid Models A COMPUTER SIMULATION Cited by: 9.

Simulation of field populations. Kidd. The paper describes the development of a computer model designed to simulate the field population dynamics of the large pine aphid, Interannual dynamics of aerial and arboreal green spruce aphid populations, Population Ecology, /s, 52, 2, (), ().

Wiley Cited by:   The population size and structure of the green spruce aphid was followed throughout the spring — summer cycle on the same group of trees in a low-elevation coastal Sitka spruce forest for three consecutive years.

The relationship between the pattern of change and the phenology of bud burst, which heralds a marked change in needle sap quality, suggests that yearly differences in the winter Cited by: There is accumulating evidence that the origins (provenance or genetic family) of Sitka spruce (Picea sitchensis) play an important role in determining the population dynamics of the green spruce aphid (Elatobium abietinum).

Genetic variability in P. sitchensis makes it a good candidate for tree breeding, although recent genetic gains in 'super-Sitka' have not accounted for pest resistance.

The impact of green spruce aphid (Elatobium abietinum (Walker)) outbreaks on the growth of a Sitka spruce stand in east Iceland during and was evaluated in a field study. In North East Scotland small numbers of all developmental stages of the green spruce aphid survived on Sitka spruce needles during the summer months despite the nutritional inadequacy of these needles for aphid survival following population collapse in early summer.

The surviving adults lost weight and fat reserves in response to time and contained low numbers of embryos. Abstract. Light availability and infestation by the green spruce aphid (Elatobium abietinum) are key factors affecting the growth of Sitka spruce (Picea sitchensis) seedlings under a mature tree canopy, but their combined effect on seedling growth has not previously been quantified.A controlled outdoor experiment in which light levels (high light (HL): %, intermediate light (IL): 24%) and.

Green spruce aphid is up to 2mm long, dull green with dark red eyes It is most likely to be seen on spruce trees during late autumn to spring Old needles develop a pale mottled discolouration during the winter and many of these needles fall off in spring.

Entomophthora planchoniana and Neozygites fresenii caused infection in populations of the green spruce aphid, Elatobium abietinum, in Iceland. On this aphid species En. planchoniana was exclusively found in the western part of Iceland, while N. fresenii was exclusively found in the eastern part of Iceland.

This discrete and nearly nonoverlapping geographical distribution correlates with the. Pest description and damage The spruce aphid is green and only to inch long at maturity.

Plants affected by spruce aphid first show banded yellowish blotches on the needles, sometimes with honeydew (sticky material excreted by the aphid) present. In the UK Forestry Commission established a field experiment in Hafren Forest, Wales, to determine the impact of the green spruce aphid (Elatobium abietinum) and root aphids (Pachypappa spp.) on the growth of young, year-old Sitka spruce (Picea sitchensis).

Four experimental treatments were created by applying insecticides to maintain or control E. abietinum and root aphids, together. THE USE OF CLASSICAL BIOLOGICAL CONTROL TO PRESERVE FORESTS IN NORTH AMERICA DESCRIPTION OF PEST Taxonomy Elatobium abietinum Walker is a spruce-feeding aphid that in Europe is referred to as the green spruce aphid (Day et al., a) (Fig.

However, in North America E. abietinum is known simply as the spruce aphid, while the common name “green spruce aphid.

Extensive European literature (see Day et al. ) describes spruce aphid maritime populations as increasing on dormant spruce in late win-ter through late spring, with occasional modest increases in the autumn.

The aphids suck sap from host needle phloem cells, attacking the most recently produced needles after the foliage matures and hardens. trees, particularly Sitka spruce. In Alaska, coastal spruce in tidewater areas and stressed areas, such as urban locations, are particularly susceptible to this aphid.,GHQWLÀFDWLRQ Spruce aphids are small (1/16 th inch), soft-bodied insects.

The aphids are green and usually wingless; however, a winged generation may be produced to facilitate. Title: Silvicult. & Forest. Mngmt. Author: Joanne Created Date: 8/14/ AM. Akimoto, S. () Ecological factors promoting the evolution of colony defense in aphids: Computer simulations.

Insectes Sociaux, 43, 1 – Akimoto, S., & Yamaguchi, Y. () Gall usurpation by the gall-forming aphid, Tetraneura sorini (Insecta Homoptera). Buy The green spruce aphid in western Europe: Ecology, status, impacts and prospects for management (Forestry Commission technical paper) on FREE.

The spruce aphid in British Columbia apparently has only two stages: nymph and adult. As with most aphids, outbreaks of the spruce aphid occur from time to time and the outbreaks are difficult to predict; however, outbreaks often follow mild winters.

There is a sharp decline in the aphid population on Sitka spruce between late spring and November. Green spruce aphid Elatobium abietinum is an important defoliating pest of Sitka spruce Picea sitchensis that may become more damaging in the future as a result of climate change.; Mild winters and higher spring temperatures increase E.

abietinum population densities, although this positive response to warmer conditions might be over‐ridden if E. abietinum is adversely affected by.The green spruce aphid has an unusual life cycle in that populations often continue to feed and reproduce through the winter.

In spring and early summer alates are produced in response to the changing nutritional status of the host. They then migrate to other spruce where their nymphs aestivate for the summer before resuming development in autumn.Summary • Experiments investigating the population responses of aphids to CO2 enrichment have yielded results suggesting that aphid populations will be both larger under elevated CO2 and that.