Simulated Predictions of Insect Phenological Events Made by Using Mean and Median Functional Lower Developmental Thresholds

Legg, David; Vleet, S. M. Van; Lloyd, J. E.

doi:10.1603/0022-0493-93.3.658

Cited by 16 publications

(14 citation statements)

References 7 publications

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“…Fourth, if pest managers feel that use of mean required thermal summations and mean lower developmental thresholds would provide for accurate predictions of adult A. nigriscutis first emergence, then fewer location-years would be needed to acquire acceptable estimates of those parameters. However, as simulations conducted by Legg et al (2000) have indicated that use of median required thermal summations and median lower developmental thresholds may provide superior predictions of insect phenological events in the field, pest managers may consider using these parameters to predict the first emergence of A. nigriscutis adults. If they choose to do so, however, more location-years will be needed to acquire acceptable estimates of those parameters.…”

Section: Discussionmentioning

confidence: 99%

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Required number of location-years for estimating functional lower developmental thresholds and required thermal summations of insects: The first emergence of adult Apthona nigriscutis Foudras as an example

Legg¹,

Vleet²,

Ragsdale³

et al. 2002

International Journal of Pest Management

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Section: Discussionmentioning

confidence: 99%

“…The computer programme CALFUN (v.2.0) (Legg et al 1998b(Legg et al , 2000 can then be used to estimate the lower developmental threshold and required thermal summation. Briefly, CALFUN does this by calculating and summing thermal units (8C), for each temperature file, using each of 14`trial' or`prospective' lower developmental thresholds.…”

Section: Introductionmentioning

confidence: 99%

Required number of location-years for estimating functional lower developmental thresholds and required thermal summations of insects: The first emergence of adult Apthona nigriscutis Foudras as an example

Legg¹,

Vleet²,

Ragsdale³

et al. 2002

International Journal of Pest Management

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“…Several methods have been used for estimating the lower developmental threshold of insects from Þeld studies (Magoon and Culpepper 1932, Hoover 1955, Arnold 1959, Thomson and Moncrieff 1982, Lysyk 1989, including the modiÞed regression method of Legg et al (1998aLegg et al ( , 1998b. Recently, the modiÞed regression method was incorporated into a computer program, CALFUN (version 2.0), to calculate functional lower developmental thresholds and required degree-days (Legg et al 1998b(Legg et al , 2000. Legg et al (1998a) noted that many functional lower developmental thresholds are less in value than what they should be (biased).…”

Section: Methodsmentioning

confidence: 99%

Phenology Models for First Emergence of AdultApthona nigriscutis(Coleoptera: Chrysomelidae), a Biological Control Agent of Leafy Spurge (Euphorbiaceae)

Legg¹,

Vleet²,

Ragsdale³

et al. 2002

Environ Entomol

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“…Phenological models based on population dynamics and the environmental parameters that drive them invariably include the effect of temperature. The relationship between temperature and rate of development is a critical factor that influences pest biology, distribution and abundance (Braman et al, 1984;Legg et al, 2000;Tobin et al, 2002Tobin et al, , 2003.…”

Section: Introductionmentioning

confidence: 99%

Developmental rates of the Lappet Moth Streblote panda Hübner (1820) (Lepidoptera: Lasiocampidae) at constant temperatures

Gonzalo-Calvo

Molina

2005

Span. j. agric. res.

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Streblote panda Hübner [1820] (Lepidoptera: Lasiocampidae) is a potential pest of forest, floricultural and horticultural plants. This paper reports the rate of development of this species at six constant temperatures between 16.0 and 31.0°C (3°C increments). Individuals were monitored daily and egg, larval and pupal development times recorded. The development rate was calculated as the reciprocal of the median number of days required to complete development. Linear regression methods were used to estimate lower temperature thresholds and the number of degree-days (DDs) needed for the development of each stage (and total development) under these laboratory conditions. The average hatching time was 18.0 days at 16°C and 7.2 days at 31°C; the average larval development time was 131.8 days at 16°C and 31.7 days at 31°C. The egg-to-adult development time ranged from 189.0 days at 16°C to 48.5 days at 31°C. The threshold temperatures were 7.9, 11.9, 12.5 and 11.3°C for egg, larval, pupal and egg-to-adult development respectively. Differences between larval instars were found; threshold temperatures were lower for late instars. The number of degree days (DDs) for egg-to-adult development was estimated at 1000.0 above 11.9°C. The results suggest three full generations are possible per year in SW Spain.Additional key words: degree-days, generations, growth rate, life stages, phenology. ResumenTasas de desarrollo de la especie Streblote panda Hübner [1820] (Lepidoptera: Lasiocampidae) a distintas temperaturas.Streblote panda Hübner [1820] (Lepidoptera: Lasiocampidae) es una especie de distribución mediterránea, que ha sido catalogada como plaga potencial de diferentes plantas con interés forestal, ornamental o agrícola. Se estudió la influencia sobre las tasas de desarrollo de la especie a seis temperaturas constantes, desde 16,0 a 31,0°C, con 3°C de incremento. Las orugas fueron observadas diariamente, registrándose los tiempos de desarrollo para los estadios de huevo, larva y pupa. Las tasas de desarrollo se calcularon usando el inverso de la mediana de los días requeridos para completar el desarrollo. Se determinaron, mediante regresiones lineares, las temperaturas mínimas cardinales de desarrollo y los requerimientos de días-grado (DG) bajo condiciones de laboratorio para cada estadio. Los tiempos medios de desarrollo registrados para el estadio de huevo oscilaron desde 18,0 días a 16°C hasta 7,2 días a 31°C. El desarrollo larvario se completó en un tiempo medio que fluctuó entre los 131,8 días a 16°C y 31,7 días a 31°C. El desarrollo total registrado de la especie, de huevo a adulto, osciló entre los 189,0 días a 16°C hasta 48,5 días a 31°C. La temperatura mínima cardinal de desarrollo obtenida fue de 7,9, 11,9, 12,5 y 11,3°C para huevo, larva, pupa y desarrollo total respectivamente, siendo esta temperatura menor para los últimos estadios larvarios. Se encontraron diferencias significativas en el tiempo de desarrollo entre estadios larvarios. Los requerimientos de DG para el desarrollo total de S. panda fu...

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Simulated Predictions of Insect Phenological Events Made by Using Mean and Median Functional Lower Developmental Thresholds

Cited by 16 publications

References 7 publications

Required number of location-years for estimating functional lower developmental thresholds and required thermal summations of insects: The first emergence of adult Apthona nigriscutis Foudras as an example

Required number of location-years for estimating functional lower developmental thresholds and required thermal summations of insects: The first emergence of adult Apthona nigriscutis Foudras as an example

Phenology Models for First Emergence of AdultApthona nigriscutis(Coleoptera: Chrysomelidae), a Biological Control Agent of Leafy Spurge (Euphorbiaceae)

Developmental rates of the Lappet Moth Streblote panda Hübner (1820) (Lepidoptera: Lasiocampidae) at constant temperatures

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