2 edition of Response of green spruce aphid populations to variation in host plant genotype. found in the catalog.
Response of green spruce aphid populations to variation in host plant genotype.
Hazel Louise Armour
Thesis (D. Phil. ) - University of Ulster, 1996.
|The Physical Object|
|Pagination||viii, 248p., tables :|
|Number of Pages||248|
Aphid host plant has an effect on A. bipunctata fecundity and egg viability. Fecundity (number of eggs per female and per day, Fig. 2) was analyzed by two-way ANOVA and revealed a significant interaction between plant and day (F = ; df = 40, 63; P = ).Cited by: Effects of host plant genotype on M. persicae aphid population growth on dodder and on total amino acid and sugar contents of the plants. A, Aphid colony sizes after 9 d of feeding on vines grown on each Arabidopsis by:
No two aphid populations occupied the same host plant. To reduce the potential effect of host plant variability, all the saplings of the same species were of the same clone. Each population of C. populeti and C. populialbae was founded by a single individual taken from P. alba and each population of C. tremulae was founded by a single individual taken from P. by: After several generations of wingless females, crowding occurs and this most likely triggers a chemical cue that leads to a hormonal response within the population and a generation of winged females is produced. These winged individuals then disperse from the primary host plant and venture far and wide in search of a suitable secondary host plant.
Wingless adults are some shade of green, sometimes with a slight waxy covering, and grow to a length of about 2 mm ( in). The siphunculi (slender tubes on the fifth abdominal segment) are cylindrical, pale and slightly S-shaped, and are much longer than the cauda (tail-like protrusion). Distribution and host Class: Insecta. 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.
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Host-plant genotype also influenced the number of green aphids (Χ 2 =df = 5, P green aphids (Χ 2 =df = 5, P aphids found more often on Morex plants (t =P Cited by: A species’ genotype can have extended consequences for the structure of the surrounding community, but few studies have investigated the extended consequences of genetic variation in animals.
Accordingly, I examined the importance of genetically based variation among five populations of the ant-tended aphid Aphis asclepiadis for its interactions with both ants and by: Through this approach we ask 1) if the two gall-inducing adelgid aphids (Adelges spp.
and Sacchiphantes spp.) respond consistently to variation in host genetics (G), environment (E) and the G x E interaction. Further, on a local scale we address the relationship between host genetics, host chemotype and gall formation on spruce by: 8.
Both the total number of brown aphids and the clustering of the brown aphids were found to be influenced by a complex four‐way interaction among host‐plant genotype, Rhinanthus treatment, its own genotype, and the genotype of the competing green aphid (aphid number: Χ 2 =df = 10, P = ; aphid clustering: Χ 2 =df = 10, P = ; Fig.
3A).Cited by: A split-family experimental design allowed us to estimate the effects of aphid host plant on ladybird traits (IEE) and the extent of genetic variation in ladybird predators for response to these.
The two main causes of population changes are the aphid’s response to its host plant and to weather in the form of temperature. The aphid depends for growth on nutrients derived from sap and a high enough temperature (more than 5˚C) to benefit.
Sap nutrients are at their highest levels while spruce buds are dormantFile Size: KB. 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.
Little is known about molecular responses in plants to phloem feeding by insects. The induction of genes associated with wound and pathogen response pathways was investigated following green peach aphid (Myzus persicae) feeding on Arabidopsis.
Aphid feeding on rosette leaves induced transcription of two genes associated with salicylic acid (SA)-dependent responses to pathogens (PR. Metabotype variation in a field population of tansy plants influences aphid host selection Article in Plant Cell and Environment 41(12) July with 60 Reads How we measure 'reads'.
When parasitic plants and aphid herbivores share a host, both direct and indirect ecological effects (IEEs) can influence evolutionary processes. We used a hemiparasitic plant (Rhinanthus minor), a grass host (Hordeum vulgare) and a cereal aphid (Sitobion avenae) to investigate the genetics of IEEs between the aphid and the parasitic plant, and looked to see how these might affect or be Cited by: 2.
Both the total number of brown aphids and the clustering of the brown aphids were found to be influenced by a complex four-way interaction among host-plant genotype, Rhinanthus treatment, its own genotype, and the genotype of the competing green aphid (aphid number: Χ 2 =df = 10, P = ; aphid clustering: Χ 2 =df = 10, P.
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. A survey of studies concerning plant resistance to aphids suggests that conditions favoring sexuality can occur where different aphid genotypes are adapted to different host plant species, or where major plant resistance genes differentially affect colonizing success of aphid genotypes.
These phenomena are apparently uncommon, by: 7. Petersen, M. & Sandströ m, J. Outcome of indirect competition between two aphid species mediated by responses in their common host plant.
Func. Ecol. 15, – ().Cited by: These airborne and below‐ground interactions between plants had considerable effects on receiving plants and consequently changes in aphid growth and reproductive performance. Aphids are vulnerable to slight changes in desired plant qualities, since host plant quality is a key determinant of the fecundity of herbivores (Awmack & Leather ).Cited by: 8.
Insect-resistant plants and the adaptation problem. Plant resistance to insects enhances environmentally safe and profitable food production and ensures food security, whether the source of resistance is transgenic  or natural host plant resistance .Host plant resistance (or HPR, see glossary) uses naturally occurring resistance that is traditionally bred into commercial varieties; to date Cited by: 9.
Thus, the within‐plant spatial distribution of A. glycines likely constitutes a behavioral adaptation to within‐plant quality variation, as is observed in other aphid species (Dixon, ; Straw et al., ). There was also a decrease in adult body size in aphids reared at high densities compared to those reared at low by: 8.
We compared community genetic (plant genotype) effects with inter- intra- and mixed (inter- plus intra-) aphid competition effects on a focal genotype of pea aphid (Acyrthosiphon pisum Harris). The focal pea aphid was the pink genotype P and was supplied by Imperial College (London).
The number of instars of alatae of the green spruce aphid, Elatobium abietinum (Walker). Forestry Commission Report on Forest Research, Fisher M, The effect of previously infested spruce needles on the growth of the green spruce aphid, Elatobium abietinum, and the effect of the aphid on the amino acid balance of the host plant.
A central issue in the field of community genetics is the expectation that trait variation among genotypes play a defining role in structuring associated species and in forming community phenotypes. Quantifying the existence of such community phenotypes in two common garden environments also has important consequences for our understanding of gene-by-environment interactions at the community Cited by: 8.
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.
1). However, in North America E. abietinum is known simply as the spruce aphid, while the common name “green spruce aphid Author: Ann M. Lynch.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.
.The Effects of Host-Plant Genotype, Hybridization, and Environment on Gall-Aphid Attack and Survival in Cottonwood: The Importance of Genetic Studies and the Utility of RFLPS Author(s): Ken N. Paige and William C.
Capman Source: Evolution, Vol. 47, No. 1 (Feb., ), pp. Published by: Society for the Study of Evolution.