Biology of the strawberry aphids,<i>Pentatrichopus fragaefolii</i>(Cockerell) and<i>P. thomasi</i>Hille Ris Lambers, in California

Schaefers, G. A.; Allen, William W.

doi:10.3733/hilg.v32n08p393

Cited by 11 publications

(11 citation statements)

References 15 publications

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“…Maximum reproduction (23.4 female larvae) occurred when the weekly mean temperature was at its maximum (26.7°C) and the prelarviposition period and adult longevity were the shortest, 1.2 and 15.2 days, respectively. Field studies in the Santa Clara Valley were made by Schaefers and Allen (1962) in California where the summers (June through September) are dry and daily temperatures occasionally exceed 35°C. Rainfall is heaviest in the winter months and normally occurs from October through March, but sometimes into May.…”

Section: Discussionmentioning

confidence: 99%

“…Dicker (1952) found that under insectary conditions, embryo development in C. fragaefolii occurred when the average temperature was only 0.6°to 1.6°C (range -2.8°to 7.2°C), but he concluded that an average temperature of more than 4.4°C was needed for larviposition. Schaefers and Allen (1962) obtained laboratory data on the developmental rate, longevity, and fecundity of C. fragaefolii, using F. cbiloensis plants that were large enough to accommodate a leaf cage on the terminal leaflet of each of three leaves. The light was constant and temperatures were controlled to within ± 0.8°C.…”

Section: Discussionmentioning

confidence: 99%

“…At a constant temperature of 15.5°C, a temperature corresponding to the average of 15.6°C at which the aphids in the present work were reared, the development time was 15.0 days, approximately 30 percent longer than the estimated 10.8 days taken by the aphids in the present work to mature and begin larviposition. The difference is even greater when one considers that the C. fragaefolii reared at a constant temperature of 15.5°C by Schaefers and Allen (1962), in addition to the development time, had a prelarviposition period of 3 days.…”

Section: Discussionmentioning

confidence: 99%

“…At a constant temperature of 23.9°C, Schaefers and Allen (1962) reported that each apterae produced 20.1 larvae over 15.3 days (1.3 larvae per day). Female longevity ranged from 10 to 29 days, with a mean of 21.3 days.…”

Section: Discussionmentioning

confidence: 99%

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Comparison of vector-virus relationships of strawberry crinkle plant Rhabdovirus in two aphids (Chaetosiphon fragaefoliiandC. jacobi) infected by injection

Sylvester¹,

Richardson²

1990

Hilg

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Data were collected to estimate transmission efficiency, infectivity and net transmission rates, latent and retention periods, and retention and efficiency indexes of the strawberry crinkle virus (SCV) transmitted by apterae of Chaetosiphon fragaefolii (Cockerell) and C. jacobi (Hille Ris Lambers) infected by injection. The infectious extracts of (SCV) were prepared from virus-infected donor aphids. Data also were collected on the longevity and larviposition of SCV-infected as well as comparable apterae that were injected with similar extracts prepared from SCVfree aphids. Additional trials were done to assess the probability of transovarial passage (TOP). The effect of infection was monitored by serially transferring individual aphids to healthy Alpine strawberry test seedlings at 24-hr intervals at constant temperature (25°C) and continuous light until all aphids had died. The data on the comparative biology supported the following conclusions: 1. Injection with SCV resulted in reduced longevity of both vectors, with no significant evidence that the effect was different between the species. 2. Infection tended to reduce the number of larvae produced by C. fragaefolii, but not by C. jacobi. 3. The net reproductive rate of both infected and healthy C. jacobi tended to be lower than that of healthy C. fragaefolii. 4. Infection tended to reduce the generation time and to increase the intrinsic rate of population increase more for C. fragaefolii than for C. jacobi, but neither parameter appeared to be significantly affected by SCV infection. Continued inside back cover.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of vector-virus relationships of strawberry crinkle plant Rhabdovirus in two aphids (Chaetosiphon fragaefoliiandC. jacobi) infected by injection

Sylvester¹,

Richardson²

1990

Hilg

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“…The aphid colony was reared on a mixture of strawberry genotypes not used in the study so that a feeding bias would not develop within the aphid population. All aphids in this experiment were parthenogentic females (sexual reproduction is extremely rare in coastal populations; Schaefers and Allen 1962). I rooted six individuals of each of the 11 strawberry genotypes listed above in separate -cm tubes 3.8 # 21 (Cone-tainers, Stuewe, Corvallis, OR) filled with University of California-Davis (UC Davis) research mix.…”

Section: Methodsmentioning

confidence: 99%

Variation in and Correlation between Intrinsic Rate of Increase and Carrying Capacity

Underwood

2007

The American Naturalist

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Intrinsic population growth rate and density dependence are fundamental components of population dynamics. Theory suggests that variation in and correlations between these parameters among patches within a population can influence overall population size, but data on the degree of variation and correlation are rare. Replicate populations of a specialist aphid (Chaetosiphon fragaefolii) were followed on 11 genotypes of host plant (Fragaria chiloensis) in the greenhouse. Population models fit to these census data provide estimates of intrinsic growth rate and carrying capacity for aphid populations on each plant genotype. Growth rate and carrying capacity varied substantially among plant genotypes, and these two parameters were not significantly correlated. These results support the existence of spatial variation in population dynamic parameters; data on frequency distributions and correlations of these parameters in natural populations are needed for evaluation of the importance of variation in growth rate and density dependence for population dynamics in the field.

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Ein Beitrag zur Biologie einiger aphidivorer Entomophthoraceen

Ege

1965

Archiv. Mikrobiol.

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Biology of the strawberry aphids,Pentatrichopus fragaefolii(Cockerell) andP. thomasiHille Ris Lambers, in California

Cited by 11 publications

References 15 publications

Comparison of vector-virus relationships of strawberry crinkle plant Rhabdovirus in two aphids (Chaetosiphon fragaefoliiandC. jacobi) infected by injection

Comparison of vector-virus relationships of strawberry crinkle plant Rhabdovirus in two aphids (Chaetosiphon fragaefoliiandC. jacobi) infected by injection

Variation in and Correlation between Intrinsic Rate of Increase and Carrying Capacity

Ein Beitrag zur Biologie einiger aphidivorer Entomophthoraceen

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