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DISTRIBUTION MODEL OF HELIOTHIS ZEA (LEPIDOPTERA: NOCTUIDAE) DEVELOPMENT TIMES1

Published online by Cambridge University Press:  31 May 2012

P. J. H. Sharpe ,
R. M. Schoolfield  and
G. D. Butler Jr.
P. J. H. Sharpe
Affiliation:
Biosystems Research Division, Department of Industrial Engineering, Texas A&M University, College Station, Texas 77843
R. M. Schoolfield
Affiliation:
Biosystems Research Division, Department of Industrial Engineering, Texas A&M University, College Station, Texas 77843
G. D. Butler Jr.
Affiliation:
Western Cotton Research Laboratory, Agricultural Research, SEA, USDA, Phoenix, Arizona 85040
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Abstract

Two geographical biotypes (G and A) of Heliothis zea Boddie were identified in a constant temperature laboratory study. The G (Georgia) biotype was found to have a mean development rate 5 ± 1% faster and coefficient of variability 44 ± 9% higher than the comparable A (Arizona) biotype. Each geographical biotype was described by a biophysically based, nonlinear development function with an R2 equal to 0.995. At temperature ranging from 15.6° to 35.6°C, the adult emergence distributions transformed to a physiological age scale were shown statistically to be independent of temperature. They could be described by a “same shape” distribution function. The empirical same shape distribution for rate was not significantly different from a hypothetical normal distribution.

Résumé

Deux biotypes géographiques (G et A) d’Heliothis zea Boddie ont été identifiés lors d’une étude de laboratoire à température constante. Le biotype G (Georgia) a une vitesse de développement de 5 ± 1% plus élevée, et uncoefficient de variation de 44 ± 9% plus élevé que le biotype A (Arizona). Chaque biotype géographique est décrit par une fonction non-linéaire du développement, ayant une base biophysique, et dont le R2 est de 0.995. A des températures allant de 15.6 à 35.6°C, les distributions de l’émergence des adultes adaptées à une échelle d’âge physiologique se sont révélées statistiquement indépendantes de la température. Elles peuvent être décrites par une fonction de distribution “uniforme”. La distribution empirique uniforme du taux de développement n’est pas significativement différente d’une distribution normale hypothétique.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 9 , September 1981 , pp. 845 - 856
Copyright
Copyright © Entomological Society of Canada 1981

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