The causes and processes of the mid-summer population crash of the potato aphids Macrosiphum euphorbiae and Myzus persicae (Hemiptera: Aphididae)

2003 ◽  
Vol 93 (5) ◽  
pp. 425-438 ◽  
Author(s):  
A.J. Karley ◽  
J.W. Pitchford ◽  
A.E. Douglas ◽  
W.E. Parker ◽  
J.J. Howardh
Keyword(s):  
Natural Enemies ◽  
Myzus Persicae ◽  
Population Change ◽  
Sampling Period ◽  
Experimental Manipulation ◽  
Aphid Species ◽  
Early Summer ◽  
Macrosiphum Euphorbiae ◽  
Population Crash ◽  
The Uk

AbstractPopulations of many phloem-feeding aphid species in temperate regions increase exponentially in early summer and then ‘disappear’, usually over a time-scale of a few days, in July. To understand these dynamics, empirical investigation of the causes and modelling of the processes underlying population change are required. Numbers of the aphids Myzus persicae (Sulzer) and Macrosiphum euphorbiae (Thomas), monitored over three years in commercial potato fields in the UK, increased to a maximum of 2–2.5 per leaflet on 16 July in 1999 and 2001, and then declined to < 0.25 per leaflet by 26 July. In 2000, aphid numbers remained very low (< 0.25 per leaflet) throughout the season. The onset of the crash in aphid numbers (16–19 July in 1999 and 2001) was consistently associated with changes in the phloem amino acid composition of potato leaflets. Natural enemies, including syrphids, parasitoids, coccinellids, chrysopids and entomopathogenic fungi, increased in abundance throughout the sampling period. The incidence of winged emigrant aphids prior to the crash was low (< 10%). Experimental manipulation during 2001 demonstrated that, during the crash period, the fecundity of aphids (caged on leaves to exclude natural enemies) was depressed by 25–45% relative to earlier in the season, and that presence of natural enemies reduced aphid numbers by up to 68%. Using these data, an excitable medium model was constructed, which provided a robust description of aphid population dynamics in terms of plant development-induced changes in aphid fecundity and temporal change in natural enemy pressure.

The role of the color of the substratum on the initiation of the probing behavior in Myzus persicae (Sulzer) and Macrosiphum euphorbiae (Thomas) (Homoptera: Aphididae)

1990 ◽  
Vol 68 (4) ◽  
pp. 694-698 ◽  
Author(s):  
Yvan Pelletier
Keyword(s):  
Myzus Persicae ◽  
Green Peach Aphid ◽  
Lower Surface ◽  
Aphid Species ◽  
Macrosiphum Euphorbiae ◽  
Potato Leaf ◽  
Potato Aphid ◽  
Probing Behavior

Twenty-five colors were evaluated for their effect on the initiation of probing behavior in the green peach aphid, Myzus persicae (Sulzer), and the potato aphid, Macrosiphum euphorbiae (Thomas). The proportion of aphids of both species initiating probing behavior was maximum on green, yellow, or orange and lowest on purple, blue, white, or black. The time taken by individual aphids to begin probing was shorter for M. persicae than for M. euphorbiae but was essentially unaffected by colors. A larger proportion of both aphid species probed on the lower surface of potato (var. Kathadin) leaflet compared with the upper surface. The proportion of aphids initiating probing was the same on the lower surface of a potato leaf and on paper similar in color, indicating that the color of the substratum is determinant in the initiation of feeding for those aphids.

Aphid (Hemiptera: Aphididae) populations and the incidence of virus yellows on insecticide-free sugarbeet in south-eastern England in 1978-81

1987 ◽  
Vol 77 (4) ◽  
pp. 617-628 ◽  
Author(s):  
W. A. Thornhill ◽  
G. D. Heathcote
Keyword(s):  
Myzus Persicae ◽  
Annual Variation ◽  
Aphid Species ◽  
The Other ◽  
Aphis Fabae ◽  
Macrosiphum Euphorbiae ◽  
South Eastern ◽  
Winter Temperatures ◽  
Syrphid Larvae ◽  
Aphid Populations

AbstractThe populations of the most common aphid species on sugarbeet, and their principal predators, were monitored on insecticide-free study areas of the crop in south-eastern England in 1978–81. The peak populations of Myzus persicae (Sulzer) varied considerably in size from year to year and were related to the severity of the previous winter. Those of Aphis fabae fabae Scopoli, which occurred slightly later in the season, also varied greatly in size but were not strongly linked to winter temperatures. The sizes of the peak populations of Macrosiphum euphorbiae (Thomas) were similar each year. The annual variation in the level of infection by virus yellows reflected the peak populations of Myzus persicae and not those of the other aphid species. Coccinellids first appeared in the sugarbeet each year in mid-late June, as the aphid populations were developing, and their peak populations did not vary greatly from year to year. Syrphid larvae appeared later in the season than coccinellids, and their numbers seemed closely linked to those of A. f. fabae. Anystid mites were observed on most count dates in all years. The implications of the findings of the study for control of aphids and virus yellows are discussed.

scholarly journals Plum Pox in North America: Identification of Aphid Vectors and a Potential Role for Fruit in Virus Spread

2004 ◽  
Vol 94 (8) ◽  
pp. 868-874 ◽  
Author(s):  
Frederick Gildow ◽  
Vern Damsteegt ◽  
Andrew Stone ◽  
William Schneider ◽  
Douglas Luster ◽  
...  
Keyword(s):  
Myzus Persicae ◽  
Acyrthosiphon Pisum ◽  
Rhopalosiphum Padi ◽  
Aphid Species ◽  
Aphis Fabae ◽  
Macrosiphum Euphorbiae ◽  
Plum Pox Virus ◽  
Long Distance ◽  
Metopolophium Dirhodum ◽  
Aphid Vectors

Thirteen aphid species were tested for their ability to transmit Pennsylvania isolates of Plum pox virus (PPV) collected in Columbia (PENN-3), Franklin (PENN-4), and York (PENN-7) Counties, PA. Four species, Aphis fabae, A. spiraecola, Brachycaudus persicae, and Myzus persicae, consistently transmitted PPV in preliminary transmission tests. Two species, Metopolophium dirhodum and Rhopalosiphum padi, were occasional inefficient vectors. Toxoptera citricida, from Florida, also was an effective vector but it does not occur in major stone-fruit-growing states. Species not transmitting PPV in parallel tests included Acyrthosiphon pisum, Aphis glycines, Aulacorthum solani, Macrosiphum euphorbiae, Rhopalosiphum maidis, and Sitobion avenae. When given a 3-day probing access period simultaneously on PPV-infected peach seedlings and healthy peach seedlings, Myzus persicae, Aphis spiraecola, A. fabae, and B. persicae transmitted PPV to 63, 31, 38, and 32% of the healthy peach seedlings, respectively. When given a similar probing period on PPV-infected peach fruit and healthy peach seedlings, the same aphid species transmitted PPV to 50, 35, 0, and 0% of seedlings, respectively. Results support the hypothesis of secondary PPV spread by indigenous aphids in Pennsylvania, and suggest that PPV-infected fruit has the potential to function as a virus source for long-distance dispersal.

Stereoscan views of some aphid mouthparts

1970 ◽  
Vol 48 (5) ◽  
pp. 1033-1034 ◽  
Author(s):  
Jean B. Adams ◽  
Forest W. Fyfe
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Myzus Persicae ◽  
Aphid Species ◽  
Macrosiphum Euphorbiae ◽  
Scanning Electron

The mouthparts, particularly the probosces of two aphid species, Myzus persicae (Sulzer) and Macrosiphum euphorbiae (Thomas), are compared with the use of the scanning electron microscope. The details of the setae on the terminal segments of the winged and wingless morphs are compared.

Aphids and associated natural enemies on Ile Amsterdam and Ile Saint-Paul, Southern Indian Ocean

2010 ◽  
Vol 22 (4) ◽  
pp. 379-385 ◽  
Author(s):  
Maurice Hullé ◽  
Evelyne Turpeau ◽  
Sylvie Hudaverdian ◽  
Bernard Chaubet ◽  
Yannick Outreman ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Host Plants ◽  
Rhopalosiphum Padi ◽  
Saint Paul ◽  
Aphid Species ◽  
Macrosiphum Euphorbiae ◽  
Research Station ◽  
Native Plant ◽  
Invertebrate Fauna ◽  
Volcanic Islands

AbstractIle Amsterdam (37°50′S, 77°30′E, 55 km2) and Ile Saint-Paul (38°43′S, 77°31′E, 7 km2) are very isolated volcanic islands which were originally colonized by a few invertebrate fauna and flora. Invasive species richness has then increased along with human activity. A three-year monitoring programme (1997, 2000, 2001) and a summer campaign (2007) allowed species diversity, host plants, abundance and phenology of introduced aphids and natural enemies to be described. Seven cosmopolitan aphid species have been found on Ile Amsterdam (Aulacorthum solani,A. circumflexum,Macrosiphum euphorbiae,Myzus ascalonicus,M. cymbalariae,M. ornatusandRhopalosiphum padi) and three on Ile Saint-Paul (A. solani,M. cymbalariaeandR. padi). On Ile Amsterdam, these aphids were found on 28 host plants (out of 57 sampled plants), mainly introduced species.Phylica arboreawas the only native plant much colonized by one aphid species,A. circumflexum. Aphids were mainly present on the base or in this vicinity. One Hymenopteran parasitoid,Aphidius matricariae, and two hyperparasites (Dendrocerus aphidumandPhaenoglyphis villosa), probably introduced along with their host, were collected. Aphid activity is very low during the autumn (March–May) and at a maximum in spring and summer. Their density and diversity decrease with distance from the research station. From these results, the possible impact of aphids on native plants is discussed.

Detection of insecticide resistance by immunological estimation of carboxylesterase activity in Myzus persicae (Sulzer) and cross reaction of the antiserum with Phorodon humuli (Schrank) (Hemiptera: Aphididae)

1986 ◽  
Vol 76 (1) ◽  
pp. 97-107 ◽  
Author(s):  
A. L. Devonshire ◽  
G. D. Moores ◽  
R. H. Ffrench-Constant
Keyword(s):  
Myzus Persicae ◽  
Esterase Activity ◽  
Aphid Species ◽  
Cross Reaction ◽  
Enzyme Linked Immunosorbent Assay ◽  
Mutant Form ◽  
Phorodon Humuli ◽  
Wide Range ◽  
Quantitative Changes ◽  
The Uk

AbstractAn antiserum was prepared against carboxylesterase E4, the enzyme conferring resistance in Myzus persicae (Sulzer) to a wide range of insecticides, and the immunoglobulin G (IgG) fraction was purified from it by affinity chromotography. Interactions of the antiserum and IgG with aphid homogenates and the purified esterase proteins were studied by immune diffusion, immunoelectrophoresis and enzyme-linked immunosorbent assay (ELISA). In M. persicae, the interactions were specific for E4 and its closely-related mutant form, FE4, and except for Phorodon humuli (Schrank), there was no cross-reaction with homogenates of the nine other aphid species examined. These studies confirmed the quantitative changes in E4 protein previously reported and established that the increased esterase activity in P. humuli also arises from the production of more protein, or proteins, homologous to E4. Resistance of M. persicae could be characterized by immunoelectrophoresis even after preservation of the insects in 30% ethanol. Although ELISA could also be used to identify resistance, a simpler immunoplate assay was developed based on measuring the esterase activity of E4 retained when the enzyme bound to IgG. This assay discriminates well between the three resistant M. persicae variants common in the field in the UK, and its simplicity allows the study of large numbers of insects.

Decision trees to assess the risk of cereal aphid (Hemiptera: Aphididae) outbreaks in summer in England

1984 ◽  
Vol 74 (3) ◽  
pp. 387-398 ◽  
Author(s):  
Alan M. Dewar ◽  
Nick Carter
Keyword(s):  
Decision Trees ◽  
Natural Enemies ◽  
Field Data ◽  
Sowing Date ◽  
Aphid Species ◽  
Early Summer ◽  
Cereal Aphid ◽  
Metopolophium Dirhodum ◽  
Factors Affecting ◽  
Two Factors

AbstractRecent studies on the ecology of two cereal aphid species, Sitobion avenae (F.) and Metopolophium dirhodum (Wlk.), are reviewed. The most important factors affecting their abundance were used to construct decision trees to assess the risk of outbreaks of these species in the summer in England. These factors for S. avenae were crop sowing date, the size of the autumn migration, the severity of the winter, the size of the spring migration and the incidence of natural enemies in spring and early summer. For M. dirhodum, only the last two factors were considered as it does not occur on cereals until the spring in England. These decision trees were successfully tested using field data from 1983, when no outbreaks of either species occurred due to the effects of natural enemies.

Incidence of yellows in sugar beet as affected by variation in plant density and arrangement

1982 ◽  
Vol 72 (2) ◽  
pp. 289-294 ◽  
Author(s):  
G. R. Johnstone ◽  
T. B. Koen ◽  
H. L. Conley
Keyword(s):  
Virus Infection ◽  
Sugar Beet ◽  
Myzus Persicae ◽  
Plant Density ◽  
Aphid Species ◽  
Regression Equation ◽  
Flight Activity ◽  
Macrosiphum Euphorbiae ◽  
Row Crops ◽  
Image Position

AbstractAphid species found infesting sugar-beet in Tasmania were Aphis craccivora Koch, Aulacorthum solani (Kalt), Macrosiphum euphorbiae (Thos.) and Myzus persicae (Sulz.). The activity of infective alatae over plots of sugar-beet established by sowing at different densities and arrangements to produce 12 treatments was gauged by recording the numbers of plants which became affected with virus yellows symptoms. The incidence of yellows increased as plant density decreased and as plant arrangement altered from rectangular to more square patterns. A regression equation of the form: where a, b, c and d were constants and x and y the intra- and interrow spacings, respectively, accounted for 92% of the variation produced by the 12 treatments. These results indicate that the incidence of virus infection in row crops resulting from aphid flight activity may be manipulated through altering plant density and arrangement.

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