THERMAL CONSTANTS FOR DEVELOPMENT OF THE PEA APHID (HOMOPTERA: APHIDIDAE) AND SOME OF ITS PARASITES

1977 ◽  
Vol 107 (4) ◽  
pp. 419-423 ◽  
Author(s):  
A. Campbell ◽  
M. Mackauer
Keyword(s):  
First Generation ◽  
Acyrthosiphon Pisum ◽  
Pea Aphid ◽  
Aphidius Ervi ◽  
Temperature Threshold ◽  
Thermal Constants ◽  
Lower Temperature Threshold ◽  
Lower Temperature ◽  
The Relationship ◽  
Generation Offspring

AbstractThe relationship between the temperature and the speed of development is described for the Kamloops ‘biotype’ of the pea aphid, Acyrthosiphon pisum, and some of its associated hymenopterous parasites. The primary parasites are: Aphidius ervi ervi, A. ervi pulcher, A. smithi, and Praon pequodorum; and the secondary parasites are: Asaphes lucens and Dendrocerus niger. For each species the lower temperature threshold for development and the time-to-adult was determined under constant laboratory conditions using field-grown alfalfa as a host plant for the pea aphid and the first-generation offspring of field-collected aphids and parasites. The thermal constants enable the prediction of aphid and parasite population growth, as influenced by temperature, on a physiological time-scale.

scholarly journals Temperature dependent development of Phenacoccus solenopsis under laboratory conditions

2017 ◽  
Vol 21 (1) ◽  
pp. 25 ◽  
Author(s):  
Sanjeev Kumar ◽  
Ch. Kontodimas
Keyword(s):  
Nonlinear Models ◽  
Thermal Constant ◽  
Temperature Threshold ◽  
Critical Temperatures ◽  
Phenacoccus Solenopsis ◽  
Developmental Threshold ◽  
Cotton Mealybug ◽  
Lower Temperature Threshold ◽  
Lower Temperature ◽  
The Relationship

Cotton mealybug, Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) is an important cotton pest in Punjab, India. Development of the immature stages (four instars in female and five in male) of P. solenopsis was observed at nine constant temperatures (15, 18, 20, 25, 30, 34, 35, 38, 40°C). Using the linear model, the lower temperature threshold (tmin) for development was estimated to be 4.93 and 2.95°C and the thermal constant (K) was 333.33 and 454.54 degree days for female and male, respectively. In addition, three nonlinear models (Lactin, Bieri-1 and 3rd order polynomial) were tested to describe the relationship between temperature and development rate and to estimate the upper developmental threshold (tmax) and the optimum temperature for development (topt). Our results proved that the Bieri-1 and Lactin models and provided the best fit (r2 = 93,4 – 99,9%) and estimated accurately all the three critical temperatures, ranged tmin = 5.06 – 5.25°C, topt = 33.55 – 33.60°C, tmax = 39.99 – 40.00°C, for the total development of females and tmin = 2.82 – 3.16°C, topt = 34.01 – 34.04°C, tmax =40.00 – 40.10°C, for the total development of males.

scholarly journals Effect of elevated CO2 and temperature on thermal constants and lower threshold temperatures of maize aphid, Rhopalosiphum maidis (Fitch.) (Aphididae:Hemiptera) on maize, Zea mays (Linn.)

2021 ◽  
Vol 22 (2) ◽  
pp. 116-123
Author(s):  
D. MOUNICA ◽  
M. SRINIVASA RAO ◽  
P.V. KRISHNAYYA ◽  
A.K. PATIBANDA ◽  
V. SRINIVASA RAO
Keyword(s):  
Zea Mays ◽  
Elevated Co2 ◽  
Temperature Threshold ◽  
Nymphal Instar ◽  
Rhopalosiphum Maidis ◽  
Temperature Thresholds ◽  
Thermal Constants ◽  
Lower Temperature Threshold ◽  
The Mean ◽  
Lower Temperature

The objective of this study was to examine the development of corn leaf aphid,Rhopalosiphum maidis Fitch (Aphididae: Hemiptera) on maize Zea mays Linnaeus at elevated and ambient concentrations of CO2 (550 and 380ppm ± 25 ppm, respectively) at six temperatures (20, 25, 27, 30, 33 and 35°C) and to estimate thermal constants and lower temperature thresholds for the forecasting models based on heat accumulation units which could be developed for use in forecasting. The duration of different growth stages of R.maidis were reduced with an increase of temperature from 20°C to 35°C under both ambient and elevated CO2 conditions. The lower development threshold for first nymphal instar,second nymphal instar, third nymphal instar, fourth nymphal instar, adult duration and total development period required 10.1, 5.04, 13.42, 26.96, 10.9, 23.22 and 20.20°C under eCO2 whereas it was 13.32, 9.41, 19.13, 30.48, 16.38, 22.88 and 20.89°C under aCO2 conditions,respectively. The mean lower temperature threshold for nymph was slightly higher (16.38°C) at aCO2 compared to that of eCO2 (10.90°C) whereas for adult the mean lower temperature threshold was slightly higher (23.22°C) at eCO2 compared to that of aCO2 (22.88°C). The thermal requirement of R. maidis from first nymphal instar to adult (total development period) was found to be 100.00 degree days (DD) under eCO2 conditions as against 111.11degree days under aCO2 conditions. These estimated temperature thresholds and thermal constant can predict the pest scenarios and population dynamics of R. maidis.

INTRINSIC RATE OF INCREASE AND TEMPERATURE COEFFICIENTS OF THE APHID PARASITE EPHEDRUS CALIFORNICUS BAKER (HYMENOPTERA: APHIDIDAE)

1987 ◽  
Vol 119 (3) ◽  
pp. 231-237 ◽  
Author(s):  
M.B. Cohen ◽  
M. Mackauer
Keyword(s):  
Acyrthosiphon Pisum ◽  
Intrinsic Rate ◽  
Intrinsic Rate Of Increase ◽  
Temperature Threshold ◽  
Rate Of Increase ◽  
Pea Aphids ◽  
Aphid Parasite ◽  
Lower Temperature Threshold ◽  
Lower Temperature ◽  
Potential Use

AbstractThe demographic statistics and the temperature requirements for development of Ephedrus californicus Baker were determined under constant laboratory conditions. At 23 °C, females provided each day with forty 2nd-instar pea aphids, Acyrthosiphon pisum (Harris), lived for 13.4 days and laid 1193 eggs on average; the highest fecundity of any female was 1762 eggs. For an assumed population sex ratio of 1:1 males to females, the intrinsic rate of increase, r, was 0.371 females·female−1·day−1 when all eggs laid were counted. The lower temperature threshold for development, t, was estimated as 6.83 °C, and the time-to-adult, K, as 228.9 degree-days. The potential use of E. californicus in the biological control of the lupine aphid, Macrosiphum albifrons Essig, in England is considered.

SOME MINERAL REQUIREMENTS OF THE PEA APHID, ACYRTHOSIPHON PISUM (HOMOPTERA: APHIDIDAE)

1972 ◽  
Vol 104 (6) ◽  
pp. 927-936 ◽  
Author(s):  
J. L. Auclair ◽  
P. N. Srivastava
Keyword(s):  
Metal Ion ◽  
First Generation ◽  
Acyrthosiphon Pisum ◽  
Adult Stage ◽  
Sodium Molybdate ◽  
Pea Aphid ◽  
Sodium Borate ◽  
Manganese Zinc ◽  
Continuous Reproduction ◽  
Holidic Diet

AbstractPerformance of the pea aphid, Acyrthosiphon pisum (Harris), on a holidic diet containing different metal ions was studied by individually incorporating into the diet a salt of the metal ion to be tested. The performance of the pea aphid was markedly improved when the diet contained iron; the first-generation adults reproduced, and the second-generation nymphs moulted twice or thrice, but did not reach the adult stage. Molybdenum, boron, and copper, at certain concentrations, induced the production of some live nymphs, but manganese, zinc, calcium, and cobalt did not. However, the presence of zinc, cobalt and calcium, at most of the concentrations used, slightly improved growth and reduced mortality. Furthermore, the presence of calcium appeared essential for development to the adult stage. Tolerance to all these metals was fairly high, but sodium molybdate at a concentration of 50.0 mg, and sodium borate at concentrations of 40–100 mg/100 ml of diet, appeared to reach toxic levels.Iron was found to be essential for reproduction and a range of 53–211 μg of elemental iron per 100 ml of diet appeared to be optimum. It is suggested that a synergistic effect between at least some of these metals is required for continuous reproduction of the pea aphid.

Fish growth and degree-days II: selecting a base temperature for an among-population study

2014 ◽  
Vol 71 (9) ◽  
pp. 1303-1311 ◽  
Author(s):  
Kyle A. Chezik ◽  
Nigel P. Lester ◽  
Paul A. Venturelli
Keyword(s):  
Growth Rates ◽  
Spatial Scales ◽  
Fish Growth ◽  
Temperature Threshold ◽  
Base Temperature ◽  
Degree Days ◽  
Thermal Range ◽  
Lower Temperature Threshold ◽  
Lower Temperature ◽  
Statistical Artifact

The degree-day (DD) is a method of describing the thermal opportunity for growth and development and is becoming increasingly popular when comparing fish growth over large spatial scales (e.g., counter-gradient growth). Temperatures too cold to permit growth are excluded in the DD equation by incorporating a lower temperature threshold (To). However, there is no convention for choosing To, and unknown is the effect of an incorrect To on how growth is perceived. We simulate data to demonstrate how an incorrect To may lead to differences in temperature-corrected growth rates among populations. These differences increase with the error in To and the thermal range among simulated populations. We then show the same relationships in an analysis of length-at-age data from 81 walleye (Sander vitreus) populations in North America. Together, our results demonstrate that differences in temperature-corrected growth rates among populations can be a statistical artifact rather than a biological phenomenon, especially when populations are distributed over a large thermal gradient.

Aphidius ervi Preferentially Attacks the Green Morph of the Pea Aphid, Acyrthosiphon pisum

2007 ◽  
Vol 20 (1) ◽  
pp. 25-32 ◽  
Author(s):  
R. Libbrecht ◽  
D. M. Gwynn ◽  
M. D. E. Fellowes
Keyword(s):  
Acyrthosiphon Pisum ◽  
Pea Aphid ◽  
Aphidius Ervi

scholarly journals Symbiont-conferred immunity interacts with the effects of parasitoid genotype and intraguild predation to shape pea aphid immunity in a clone-specific fashion

2021 ◽  
Author(s):  
Samuel Alexander Purkiss ◽  
Mouhammad Shadi Khudr ◽  
Oscar Enrique Aguinaga ◽  
Reinmar Hager
Keyword(s):  
Genetic Variation ◽  
Intraguild Predation ◽  
Species Interactions ◽  
Acyrthosiphon Pisum ◽  
Species Interaction ◽  
Genetic Effects ◽  
Pea Aphid ◽  
Aphidius Ervi ◽  
Indirect Genetic Effects ◽  
Host Parasite

Host-parasite interactions represent complex co-evolving systems in which genetic variation within a species can significantly affect selective pressure on traits in the other (for example via inter-species indirect genetic effects). While often viewed as a two-species interaction between host and parasite species, some systems are more complex due to the involvement of symbionts in the host that influence its immunity, enemies of the host, and the parasite through intraguild predation. However, it remains unclear what the joint effects of intraguild predation, defensive endosymbiosis, within-species genetic variation and indirect genetic effects on host immunity are. We have addressed this question in an important agricultural pest system, the pea aphid Acyrthosiphon pisum, which shows significant intraspecific variability in immunity to the parasitoid wasp Aphidius ervi due to immunity conferring endosymbiotic bacteria. In a complex experiment involving a quantitative genetic design of the parasitoid, two ecologically different aphid lineages and the aphid lion Chrysoperla carnea as an intraguild predator, we demonstrate that aphid immunity is affected by intraspecific genetic variation in the parasitoid and the aphid, as well as by associated differences in the defensive endosymbiont communities. Using 16s rRNA sequencing, we identified secondary symbionts that differed between the lineages. We further show that aphid lineages differ in their altruistic behaviour once parasitised whereby infested aphids move away from the clonal colony to facilitate predation. The outcome of these complex between-species interactions not only shape important host-parasite systems but have also implications for understanding the evolution of multitrophic interactions, and aphid biocontrol.

scholarly journals Emergence sexual maturation and oviposition of Aphidius ervi (Hymenoptera Aphidiidae)

2004 ◽  
Vol 57 ◽  
pp. 214-220 ◽  
Author(s):  
X.Z. He ◽  
Q. Wang ◽  
D.A.J. Teulon
Keyword(s):  
Biological Control ◽  
Life Cycle ◽  
Sexual Maturation ◽  
Acyrthosiphon Pisum ◽  
Aphid Species ◽  
Pea Aphid ◽  
Aphidius Ervi ◽  
Oviposition Period ◽  
Courtship Display ◽  
Dark Conditions

Aphidius ervi Haliday is an important parasitoid of several aphid species and information is needed for the development of massrearing techniques and better understanding of biological control ecology The emergence sexual maturation and oviposition of A ervi on pea aphid Acyrthosiphon pisum (Harris) was studied in the laboratory at 201deg;C and 6070 RH with 168 h lightdark About 95 of parasitoids emerged during the photophase Females needed a significantly longer time than males to complete their life cycle Newly emerged males were able to perform their courtship display but failed to mate until they were 4 h old; newly emerged females were able to respond to males courtship display and mate Females attacked aphids in both light and dark conditions The number of eggs laid and parasitism (number of aphids parasitised) per oviposition bout (2 h oviposition period) were significantly greater in the photophase than in the scotophase

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