The effect of temperature on rates of development of larval Protostrongylus spp. (Nematoda: Metastrongyloidea) from bighorn sheep, Ovis canadensis canadensis, in the snail Vallonia pulchella

The rate of development of Protostrongylus stilesi and (or) Protostrongylus rushi in the intermediate host Vallonia pulchella was related linearly to temperature between 10 and 30 °C. The temperature threshold was 8 °C and the thermal constant was 305 degree-days. Infected snails kept at 10 °C for several days and then transferred to 25 °C produced third-stage larvae faster than expected. Rates of development of Protostrongylus spp. applied to field conditions indicated that most of the first- to third-stage development occurs during the summer, very slow development takes place in the autumn or the spring, and none occurs over the winter. These data reinforce the hypothesis formulated by D. A. Boag and W. D. Wishart that snails on the bighorn sheep wintering grounds are responsible for transmission of the lungworms to sheep in autumn.

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DEVELOPMENT OF THE CARROT RUST FLY, PSILA ROSAE (DIPTERA: PSILIDAE), RELATIVE TO TEMPERATURE IN THE LABORATORY

The Canadian Entomologist ◽

10.4039/ent113569-7 ◽

1981 ◽

Vol 113 (7) ◽

pp. 569-574 ◽

Cited By ~ 13

Author(s):

A. B. Stevenson

Keyword(s):

Effect Of Temperature ◽

Thermal Constant ◽

Degree Days ◽

Psila Rosae ◽

Egg Hatch ◽

Rate Of Development ◽

Threshold Temperatures ◽

Thermal Constants ◽

The Relationship

AbstractThe effect of temperature on development of the carrot rust fly, Psila rosae (F.), was determined at constant temperatures in the laboratory. The relationship between rate of development and temperature was essentially linear from 10° to 17.5°C but began to diverge from linearity between 17.5° and 20°C. Estimated threshold temperatures (t) and thermal constants (K) for development of overwintered pupae were 2.3°C and 319 degree-days (dd) for first emergence and 1.8°C and 368 dd for 50% emergence. For laboratory-reared stages, t and K values were 4.1°C and 102 dd for egg hatch, 2.0°C and 642 dd for development from egg to mature larvae, and 3.0°C and 107 dd for pupation. Development in the laboratory from egg (less than 24 h old) to adult was completed in 59, 70, and 81 days at 20°, 17.5°, and 15°C respectively; no threshold or thermal constant was estimated because few or no individuals completed development to adult at 12.5° or 10°C within expected times, presumably because diapause was induced at these temperatures.

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Effect of temperature on life table parameters of Phytoseius plumifer (Phytoseiidae) fed on Eotetranychus hirsti (Tetranychidae)

Systematic and Applied Acarology ◽

10.11158/saa.22.3.7 ◽

2017 ◽

Vol 22 (3) ◽

pp. 410 ◽

Cited By ~ 2

Author(s):

Jahanshir Shakarami ◽

Fereshteh Bazgir

Keyword(s):

Linear Model ◽

Effect Of Temperature ◽

Intrinsic Rate Of Increase ◽

Thermal Constant ◽

Temperature Threshold ◽

Immature Stages ◽

Degree Days ◽

Rate Of Increase ◽

Phytoseius Plumifer ◽

Increasing Temperature

Eotetranychus hirsti Pritchard & Baker (Tetranychidae) is one of the important pests of fig trees that is widely distributed in fig orchards of Iran. The predatory mite Phytoseius plumifer Canestrini & Fanzago is a phytoseiid mite on fig that can feed and reproduce on E. hirsti. The effect of four constant temperatures (20, 25, 30 and 35°C) on demographic parameters of P. plumifer fed on nymphal stages of E. hirstiwas determined under laboratory conditions at 50 ± 5% RH and a photoperiod of 16:8 h (L: D). The total developmental time of immature stages of this predator decreased with increasing temperature from 20°C to 35°C, and varied from 17.13±0.23 to 6.55±0.19 days for females. The lower temperature threshold (Tmin) and thermal constant (K) for the total immature stages of this predator was estimated 10.33˚C and 166.67 degree-days by the ordinary linear model, 11.17˚C and 147.87 degree-days by the Ikemoto linear model, respectively. Female longevity was 67.79, 47.00, 35.11, and 27.42 days at 20, 25, 30 and 35°C, respectively. The highest values of total fecundity and daily fecundity were obtained at 25˚C (35.71±1.73 eggs) and 30˚C (1.57±0.02 eggs), respectively. The value of the intrinsic rate of increase (rm) increased as increasing temperature from 20°C (0.064±0.0012 day−1) to 30°C (0.180±0.0023 day−1), and then decreased at 35°C (0.153±0.0037 day−1). The highest and lowest values of the mean generation time (T) were 32.75±0.95 and 14.18±0.51 days, which were obtained at 20°C and 35°C, respectively. The results of this study revealed that of P. plumifer is effective predator of the fig spider mite and develops effectively at a broad range of temperatures.

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Gastropod intermediate hosts of lungworms (Nematoda: Protostrongylidae) on a bighorn sheep winter range: aspects of transmission

Canadian Journal of Zoology ◽

10.1139/z90-278 ◽

1990 ◽

Vol 68 (9) ◽

pp. 1976-1982 ◽

Cited By ~ 3

Author(s):

L. A. Robb ◽

W. M. Samuel

Keyword(s):

Mule Deer ◽

Bighorn Sheep ◽

Ovis Canadensis ◽

Intermediate Hosts ◽

Gastropod Species ◽

Winter Range ◽

Infective Larvae ◽

Third Stage ◽

Inherent Problem

A study of the gastropod intermediate hosts of the lungworms Protostrongylus stilesi and Protostrongylus rushi was conducted on a bighorn sheep (Ovis canadensis canadensis) winter range in southwestern Alberta, 1984–1985. Over 7000 gastropods were examined. Seven gastropod species were infected with Protostrongylus-type larvae: the predominant intermediate hosts were Euconulus fulvus (6.8% infected), Vertigo gouldi (5.6%), and Vertigo modesta (3.2%). Prevalence of third-stage (infective) larvae was highest in September and April, coinciding with use of the winter range by bighorn sheep. An index of lungworm availability to sheep was highest in autumn in the margins of aspen copses and in spring in the grassy openings. Copses were used extensively by sheep in autumn, and open areas were used in the spring. Presence of a mule deer (Odocoileus h. hemionus) lungworm, Orthostrongylus macrotis, was an inherent problem.

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THE EFFECT OF TEMPERATURE, MOISTURE AND NITROGEN ON THE RATE OF DEVELOPMENT OF SPRING WHEAT AS MEASURED BY DEGREE DAYS

Canadian Journal of Plant Science ◽

10.4141/cjps83-106 ◽

1983 ◽

Vol 63 (4) ◽

pp. 833-846 ◽

Cited By ~ 33

Author(s):

H. R. DAVIDSON ◽

C. A. CAMPBELL

Keyword(s):

Spring Wheat ◽

Standard Error ◽

Time Scale ◽

Field Experiments ◽

Effect Of Temperature ◽

Degree Days ◽

Rate Of Development ◽

Degree Day ◽

Developmental Parameters ◽

Growth Room

A phenological index based on meteorological parameters that accurately describes the development of wheat is urgently needed by agricultural researchers. In this study, a biometeorological time scale was proposed. It was developed from data obtained in a growth chamber study in which the effect of temperature, N fertility and soil moisture on spring wheat (Triticum aestivum L.) development were assessed. The model was then proofed using data from two field experiments. A normalized time scale was derived relating phenological development to percent SD, defined as ((number of days to a selected phenological stage)/(number of days to soft dough)) × 100. The degree day equation was modified to incorporate this time scale as:[Formula: see text]where K1 is a rate constant having units % SD∙°C−1∙day−1; bo is a base temperature below which no development occurs with units °C; and Tm is the mean daily temperature between growth stages S1 and S2. This equation was used to derive values for the developmental parameters. In the growth room K = 0.0875 (standard error 0.0045) and bo = 4.6 (standard error 0.99). Under fie d conditions K1 = 0.0935 (standard error 0.0123) and bo = 2.4 (standard error 2.213). The growth room and field parameters were not significantly different at the 5% probability level. Temperature was the only environmental parameter which influenced the rate of development under the conditions of this experiment. The number of days to the various developmental stages was inversely and linearly related to mean daily temperature over the 15–25 °C range. The degree day equation was shown to be a good index of development. Under fie d conditions the number of degree days to progress a crop to the flowering stage was 703 (standard error 9.4) and to the soft dough stage 1086 (standard error 15.4). The small variability in the values of the developmental parameters obtained in the growth room and field experiments were attributed to errors in the determination of phenological dates, and differences between temperature in the crop microclimate and measured temperatures from the standard meteorological site. A further modification to the degree day equation was postulated to account for the influence of daylength on wheat development.Key words: Temperature and development, moisture and development, degree days, development of wheat

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Reciprocal crosses between two populations ofTrissolcus vassilievi(Mayr) (Hymenoptera: Scelionidae) reveal maternal effects on thermal phenotypes

Bulletin of Entomological Research ◽

10.1017/s0007485315000164 ◽

2015 ◽

Vol 105 (3) ◽

pp. 355-363

Author(s):

S. Iranipour ◽

P. BenaMolaei ◽

S. Asgari ◽

J.P. Michaud

Keyword(s):

Maternal Effect ◽

Developmental Time ◽

Adult Survival ◽

Thermal Constant ◽

Temperature Threshold ◽

Degree Days ◽

Sunn Pest ◽

Female Progeny ◽

Reciprocal Crosses ◽

Two Populations

AbstractThe egg parasitoidTrissolcus vassilievi(Mayr) (Hymenoptera: Scelionidae) is a significant natural enemy of the sunn pest,Eurygaster integricepsPuton (Hemiptera: Scutelleridae), the most important pest of wheat in Iran. This study examined the developmental time and egg-to-adult survival of two geographically separate populations ofT. vassilievion two corresponding host populations at five constant temperatures ranging from 15.0 to 35.0±1°C. No wasps of either population emerged at 15.0°C and the temperature threshold for development was similar between populations, ranging from 13.1±0.3 to 13.8±0.4°C for males and 12.2±0.1 to 12.6±0.1°C for females, but the thermal constant varied with gender and parasitoid population. Development of wasps from the colder Tabriz location was slower, with thermal constants for males and females of 172.6±3.1 and 204.1±1.2 degree-days, respectively, compared to Varamin wasps with 164.7±3.0 and 195.6±1.3 degree-days, respectively. Based on genetic inheritance patterns, reciprocal crosses between the two populations were expected to result in females with thermal phenotypes intermediate to their parental populations, and males that resembled their mothers. However, female progeny of crosses more closely resembled their maternal population, indicating a maternal effect on thermal phenotype. Furthermore, the magnitude of the maternal effect on the thermal constant was asymmetric and was more strongly expressed by Varmin than Tabriz females. These results suggest the possibility of using selective crosses between wasp populations, in combination with artificial selection in the laboratory, to tune the thermal phenotype of parasitoids to specific regions prior to augmentative releases.

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Effect of Temperature on the Survival and Developmental Rate of Immature Ooencyrtus mirus (Hymenoptera: Encyrtidae)

Journal of Economic Entomology ◽

10.1093/jee/toaa110 ◽

2020 ◽

Vol 113 (4) ◽

pp. 1675-1684 ◽

Cited By ~ 3

Author(s):

Nancy A Power ◽

Fatemeh Ganjisaffar ◽

Thomas M Perring

Keyword(s):

Biological Control Agent ◽

Developmental Rate ◽

Mass Rearing ◽

Control Agent ◽

Invasive Pest ◽

Effect Of Temperature ◽

Thermal Constant ◽

Developmental Threshold ◽

Slow Development ◽

Immature Development

Abstract Bagrada hilaris (Burmeister) is an invasive pest of cole crops in the southwestern United States. To find potential biocontrol agents of B. hilaris, three egg parasitoids were imported from Pakistan, including Ooencyrtus mirus, a recently described uniparental species. We investigated the effect of temperature on survival and developmental rate in O. mirus from egg to adult. At 14 and 16°C, no adults emerged unless the immatures were transferred later to a warmer temperature. At constant 18°C, a low percentage emerged, but again more emerged if the immatures were transferred to a warmer temperature. Survival ranged from 80 to 96% at 20–37°C and did not differ significantly among these temperatures. No adults emerged at 38°C. Regardless of the amount of time the parasitized eggs were held at 14 and 16°C, the developmental times after returning the eggs to 26°C were similar, suggesting a quiescence process rather than simply slow development. At higher temperatures, the developmental rate increased linearly from 18 to 36°C and then declined at 37°C. The Wang model provided the best fit of the data and estimated a lower developmental threshold at 13.0°C, an optimal temperature at 35.6°C, and an upper developmental threshold of 38.3°C. The thermal constant for total immature development is 168.4 degree-days. The results show 36°C to be the best temperature for rearing O. mirus, and that O. mirus-parasitized eggs can be stored at 14°C for months without losing viability. These are crucial data to consider when mass rearing this biological control agent.

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EFFECT OF TEMPERATURE ON THE LIFE-CYCLE OF ANAX JUNIUS (ODONATA: AESHNIDAE) IN CANADA

The Canadian Entomologist ◽

10.4039/ent1031671-12 ◽

1971 ◽

Vol 103 (12) ◽

pp. 1671-1683 ◽

Cited By ~ 39

Author(s):

Robert Trottier

Keyword(s):

Life Cycle ◽

Laboratory Experiments ◽

Field Studies ◽

Migration Pattern ◽

Effect Of Temperature ◽

Threshold Temperature ◽

Degree Days ◽

Rate Of Development ◽

Resident Population ◽

Anax Junius

AbstractThe effect of temperature on the rate of development of Anax junius Drury was studied. Monthly larval samples were carried out for 2 years and laboratory experiments were conducted at constant temperatures. Field studies, at a eutrophic pond near Toronto, showed that in Canada populations of A. junius are not only maintained by migrants each year but also by residents. Two distinct populations were found, a summer (non-resident) population which developed from oviposition to emergence in approximately 3 months, from June to September, and an overwintering (resident) population which overwintered as half-grown larvae and developed in approximately 11 months from mid-July of one calendar year to the end of June of the next year. The former population was larger and comprised approximately 48% males and the latter was smaller and comprised approximately 41% males. A threshold temperature of development of 8.7° ± 0.1 °C was determined in the laboratory for the development of final-instar larvae of the summer population. The rate of development of final-instar larvae, reared at constant temperature, was similar to that of the entire summer aquatic stages which developed in fluctuating temperature. An average of 1332 degree-days ± 1% was required for development from the onset of oviposition to the onset of emergence of the summer population; whereas 20.5% more degree-days were required for the development of the overwintering population, employing the threshold temperature of 8.7 °C as determined for the summer population.It is recommended that correlation between degree-day totals and duration of larval development be used in further studies as a means for understanding the migration pattern and also the climatic limit of distribution for A. junius.

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EFFECT OF TEMPERATURE ON OVIPOSITION AND EGG DEVELOPMENT IN THE SPOTTED TENTIFORM LEAFMINER, PHYLLONORYCTER BLANCARDELLA (LEPIDOPTERA: GRACILLARIIDAE)

The Canadian Entomologist ◽

10.4039/ent118781-8 ◽

1986 ◽

Vol 118 (8) ◽

pp. 781-787 ◽

Cited By ~ 1

Author(s):

R.M. Trimble

Keyword(s):

Regression Analysis ◽

Linear Regression ◽

Linear Regression Analysis ◽

Effect Of Temperature ◽

Threshold Temperature ◽

Thermal Constant ◽

Degree Days ◽

Egg Development ◽

Temperature Calculation ◽

Phyllonorycter Blancardella

AbstractThe threshold temperature (t0) for both oviposition and egg development and the thermal constant (K) for egg development were determined using linear regression analysis for an Ontario population of the spotted tentiform leafminer, Phyllonorycter blancardella (Fabr.). Fecundity was highly variable, ranging from 1 to 152 eggs, and was not significantly affected by temperature. Calculation of the daily oviposition rates for the first 4 days of the experiment and for the period from the beginning of the experiment until the day on which the last egg was laid resulted in estimates of the oviposition threshold of 9.1 and 8.9°C, respectively. The threshold temperature for egg development was estimated as 2.5°C and the thermal constant for egg development as 172.5 degree-days.

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Effect of Temperature on the Development and Survival of Feltiella Acarisuga (Vallot) (Diptera: Cecidomyiidae) Preying on Tetranychus Urticae (Koch) (Acari: Tetranychidae)

Insects ◽

10.3390/insects12060508 ◽

2021 ◽

Vol 12 (6) ◽

pp. 508

Author(s):

Yong-Seok Choi ◽

Sung-Hoon Baek ◽

Min-Jung Kim

Keyword(s):

Developmental Stages ◽

Gall Midge ◽

Mass Rearing ◽

Immature Stage ◽

Development Rate ◽

Effect Of Temperature ◽

Thermal Constant ◽

Fundamental Information ◽

Threshold Temperatures ◽

Response To Temperature

The predatory gall midge, Feltiella acarisuga (Vallot) (Diptera: Cecidomyiidae), is an acarivorous species that mainly feeds on spider mites (Acarina: Tetranychidae). Because of its cosmopolitan distribution and predation efficacy, it is considered an important natural enemy available as a biological agent for augmentative biocontrol. However, despite its practical use, the thermal development and survival response to temperature have not yet been fully studied. In this study, we investigated the stage-specific development and survival of F. acarisuga at seven temperatures (11.5, 15.7, 19.8, 23.4, 27.7, 31.9, and 35.4 °C) to examine the effect of temperature on its lifecycle. All developmental stages could develop at 11.5–31.9 °C, but the performance was different according to the temperature. From the linear development rate models, the lower development threshold and thermal constant of the total immature stage were estimated at 8.2 °C and 200 DD, respectively. The potential optimal and upper threshold temperatures for the total immature stage were estimated as 29.3 and 35.1 °C using a non-linear development model. The operative thermal ranges for development and survival at 80% of the maximum rate were 24.5–32.3 and 14.7–28.7 °C, respectively. Thus, it was suggested that 24.5–28.7 °C was suitable for the total immature stage. In contrast, conditions around 8 °C and 35 °C should be avoided due to the lower development rate and high mortality. Our findings provide fundamental information for an effective mass-rearing and releasing program of F. acarisuga in an augmentative biocontrol program and help to predict phenology.

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