The Effects of the Lime Aphid (Eucallipterus tiliae L.) (Aphididae) on the Growth of the Lime (Tilia X Vulgaris Hayne). II. The Primary Production of Saplings and Mature Trees, the Energy Drain Imposed by the Aphid Populations and Revised Standard Deviations of Aphid Population Energy Budgets

M. Llewellyn

doi:10.2307/2401714

The Effects of Νatural Enemies on Aphid Populations on Processing Tomato in Central Greece

ENTOMOLOGIA HELLENICA ◽

10.12681/eh.14036 ◽

2017 ◽

Vol 13 ◽

pp. 35 ◽

Cited By ~ 13

Author(s):

Ρ. Lykouressis ◽

D. CH. Perdikis ◽

CH. Α. Chalkia

Keyword(s):

Growing Season ◽

Aphid Population ◽

Parasitoid Species ◽

Tomato Plants ◽

Central Greece ◽

Processing Tomato ◽

Vegetable Products ◽

Population Peak ◽

Population Suppression ◽

Aphid Populations

Two species of aphids, Macrosiphion euphorbiae (Thomas) and Myzus persicae cae (Sulzer) (Homoptera: Aphididae) were the only ones which developed populations on processing tomato in a two year study conducted in central Greece. The aphid population structure showed that M. euphorbiae was much more abundant than M. persicae in both years. The former species peaked in August whilst the latter did not show any particular peak over the two successive years. Some species of natural enemies were recorded. Orius niger Wolff was found in low numbers scattered over a long period but mainly towards the end of the growing season, and it did not correlate with the aphid population. The rate of parasitism of M. euphorbiae by Aphelinus abdominalis Dalman and Praon volucre (Haliday) was very low and it seemed that these two parasitoid species did not have any particular effect on the aphid population suppression. Macrolophus pygmaeus Rambur was the key natural enemy and the most abundant and effective among the predators found. Its highest numbers occurred towards the end of the growing season following the aphid population peak, suggesting a numerical response of this species to its prey. A proportion of the population of M. pygmaeus occurring on tomato plants after fruit harvesting, might he collected and subsequently released in crops such as tomato, pepper and eggplant to biologically control pests in greenhouses, like aphids and whiteflies, thus contributing to the production of healthy vegetable products.

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SEASONAL ABUNDANCE OF RED AND GREEN MORPHS OF THE TOBACCO APHID (HOMOPTERA: APHIDIDAE) ON FLUE-CURED TOBACCO IN GEORGIA

Journal of Entomological Science ◽

10.18474/0749-8004-24.4.531 ◽

1989 ◽

Vol 24 (4) ◽

pp. 531-538 ◽

Cited By ~ 3

Author(s):

Robert M. McPherson

Keyword(s):

High Temperatures ◽

Field Experiments ◽

Aphid Population ◽

Seasonal Abundance ◽

Population Increase ◽

Population Densities ◽

Early Season ◽

Myzus Nicotianae ◽

Aphid Populations ◽

Tobacco Aphid

The seasonal abundance of red and green morphs of the tobacco aphid, Myzus nicotianae Blackman, was investigated on flue-cured tobacco in Georgia during 1987–1988. The effect of tobacco transplantation date also was examined in 1988. Aphid populations peaked on tobacco in mid-June 1987, then rapidly declined following the removal of the terminal floral branch (topping). Early season samples contained both green and red morphs; however, by early June, and throughout the remainder of the season, the aphid population was almost exclusively comprised of the red morph. Similar results were obtained in 1988, although population densities were higher and peaked earlier in the early transplanting (30 March) compared to the 14 April and 28 April transplantings. Regardless of transplanting date, the red morphs began a rapid population increase about 45 days after transplantation, and this increase continued until plants were topped. Daily high temperatures exceeding 35°C did not appear detrimental to the red morphs in these field experiments.

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Comparisons Between Alate Aphids Caught in Υellow Water Traps and Aphid Populations on Tomato Plants

ENTOMOLOGIA HELLENICA ◽

10.12681/eh.14009 ◽

2017 ◽

Vol 11 ◽

pp. 29 ◽

Cited By ~ 1

Author(s):

P. Lykouressis ◽

D. CH. Perdikis ◽

CH.A. Chalkia ◽

S. C. Vardaki

Keyword(s):

Total Population ◽

Macrosiphum Euphorbiae ◽

Aphid Population ◽

Tomato Plants ◽

Growing Seasons ◽

Significant Relationships ◽

Water Traps ◽

Plant Sampling ◽

Trap Catches ◽

Aphid Populations

Aphid monitoring was conducted by means of yellow Moericke water traps placed in tomato fields in two different localities in Co Boiotia during the growing seasons in 1992 and 1993. Additionally, aphid population densities were estimated by plant sampling. Macrosiphum euphorbiae (Thomas) and Myzus persicae (Sulzer) were the only species which developed populations on plants. Regression analysis between the number of alates from traps with either the number of alates or the total aphid population on plants showed that there was no correlation in the case of M. persicae for both localities and years. However, there were significant relationships between the number of alates in traps and either the number of alates on plants (r2=0.83) or the total aphid population on plants (r2=0.69) for M. euphorbiae in 1992. In 1993, such significant relationships were not found for the latter species, most probably due to extremely low trap catches. Significant relationships were also found between alates in traps, during their immigration period, with either alates on plants (r2=0.93) or the total population on plants (r2=0.80) in M. euphorbiae in 1992.

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NUMERICAL RESPONSE OF COCCINELLIDS TO APHIDS IN CORN IN SOUTHERN ONTARIO

The Canadian Entomologist ◽

10.4039/ent112977-10 ◽

1980 ◽

Vol 112 (10) ◽

pp. 977-988 ◽

Cited By ~ 55

Author(s):

E. Jane Wright ◽

J. E. Laing

Keyword(s):

Coleomegilla Maculata ◽

Aphid Population ◽

Numerical Response ◽

Southern Ontario ◽

Rhopalosiphum Maidis ◽

Corn Leaf Aphid ◽

Aphid Populations

AbstractPopulations of two abundant coccinellid species, Coleomegilla maculata lengi Timberlake and Hippodamia tredecimpunctata tibialis Say, responded rapidly to corn leaf aphid populations [Rhopalosiphum maidis (Fitch)] once the aphids became exposed to predation when the plants tasselled. Coleomegilla m. lengi oviposited at lower densities of aphids than did H. t. tibialis but H. t. tibialis was shown to have a greater numerical response than C. m. lengi at high densities of aphids due to its greater fecundity. The numerical response of the coccinellids by oviposition was linear with a lag of 1/2 week behind the aphid population.

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Ecological Energetics and Natural History of Hedriodiscus truquii (Diptera) in Two Thermal Spring Communities

Journal of the Fisheries Research Board of Canada ◽

10.1139/f71-012 ◽

1971 ◽

Vol 28 (1) ◽

pp. 73-94 ◽

Cited By ~ 33

Author(s):

John G. Stockner

Keyword(s):

Natural History ◽

Primary Production ◽

Hot Springs ◽

Census Data ◽

Larval Growth ◽

Thermal Spring ◽

Energy Budgets ◽

Population Census ◽

Mount Rainier National Park ◽

History Of

The interrelations of flora and fauna of the Ohanapecosh Hot Springs, Mount Rainier National Park, Washington State, were studied during a 4-year period commencing in 1963. The flow of energy and efficiency of its transfer were measured in two springs, one with an annual mean temperature of 35 C (SD 2.0) and the other a constant 47 C. In addition to temperature differences, each spring contained a different flora and fauna.Primary production estimates were obtained together with data relative to many aspects of the natural history of the dominant dipteran herbivore Hedriodiscus truquii (Bellardi), hitherto undescribed in the larval stage, and common to both springs. Aspects of the natural history of Hedriodiscus pertinent to the energetic approach are discussed, including a detailed caloric investigation. Information about the seasonal variation in lipid composition during larval growth was used to explain much of the observed caloric variation. Energy budgets for three of the four instars of Hedriodiscus were determined from estimates of growth, respiration, and rates of food ingestion. This information together with population census data permitted calculation of population energy budgets. Efficiencies of energy transfer in both spring communities are compared and discrepancies in the allocation of assimilated energy between populations are attributed to variation in diel behavior patterns and differences in food ingested. Export of Hedriodiscus larvae and spider predation on newly emerged adults inflicted heavy mortality and were considered the most important sources of population regulation. The annual energy balance for the two springs was tabulated from estimates of energy income and export. The springs fixed far more energy than was expended in any given year. Greatest losses are attributed to algal export, respiration, and travertine deposition; tree leaves represented a significant income of energy to the springs. Primary production accounted for better than 90% of total income and only 0.5–1.0% of algal primary production was channeled to the dominant herbivore, Hedriodiscus. Of algal gross production 20–25% was exported from the system. Photosynthetic efficiency was 1.06% utilization of visible light available to algae.

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Aphid Populations and Spread of Peanut Mottle Virus1

Peanut Science ◽

10.3146/i0095-3679-8-2-5 ◽

1981 ◽

Vol 8 (2) ◽

pp. 99-102 ◽

Cited By ~ 2

Author(s):

H. B. Highland ◽

J. W. Demski ◽

J. H. Chalkley

Keyword(s):

Myzus Persicae ◽

Aphis Craccivora ◽

Aphid Population ◽

Mottle Virus ◽

Laboratory Studies ◽

Rhopalosiphum Maidis ◽

First Report ◽

Aphis Craccivora Koch ◽

Aphid Populations

Abstract Higher percentages of peanuts than soybeans or cowpeas become infected when these crops are growing equal distances from a source of peanut mottle virus (PMV). The total number of aphids trapped in these crops are about equal and cannot explain this differential percentage infection. Known vectors of PMV such as Aphis craccivora Koch and Myzus persicae (Sulzer) comprised 31% of the aphid population in peanuts compared to 14% in soybeans and 17% in cowpeas and could be responsible for the higher number of peanut infections. In addition, trapping of live aphids in peanut fields showed that viruliferous Rhopalosiphum maidis (Fitch) were present. Laboratory studies confirmed R. maidis could transmit PMV from peanut to peanut. This is the first report of R. maidis as a vector of PMV.

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