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PREDICTING WESTERN CORN ROOTWORM BEETLE (COLEOPTERA: CHRYSOMELIDAE) EMERGENCE FROM THE SOIL USING SOIL OR AIR TEMPERATURE

Published online by Cambridge University Press:  31 May 2012

N.C. Elliott ,
J.J. Jackson  and
R.D. Gustin
N.C. Elliott
Affiliation:
Northern Research Service, U.S. Department of Agriculture, Brookings, South Dakota, USA 57006
J.J. Jackson
Affiliation:
Northern Research Service, U.S. Department of Agriculture, Brookings, South Dakota, USA 57006
R.D. Gustin
Affiliation:
Northern Research Service, U.S. Department of Agriculture, Brookings, South Dakota, USA 57006
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Abstract

A temperature-dependent multiple cohort simulation model was used to predict emergence of western corn rootworms, Diabrotica virgifera virgifera LeConte, from the soil. Hourly 10-cm-depth soil temperatures were used as input to the model. Hourly soil temperatures were predicted from daily minimum and maximum 10-cm-depth soil temperatures using a half-sine-wave approximation, or from minimum and maximum daily 1-m-height air temperatures using a model for predicting soil temperature from air temperature. The mean difference in the number of days between predicted and observed 50% emergence was 0.22 days using soil temperatures and 0.00 days using air temperatures. Linear regressions of predicted versus observed Julian dates of 10, 50, and 90% cumulative beetle emergence from the soil indicated that model predictions were reasonably accurate and precise using both soil and air temperatures.

Résumé

Un modèle de simulation de cohortes multiples dépendantes de la température a été utilisé pour prédire l’éclosion du sol de la chrysomèle occidentale des racines de maïs, Diabrotica virgifera virgifera. Les températures du sol à toutes les heures, à une profondeur de 10 cm, ont été utilisées comme entrées au modèle. La température de chaque heure a été prédite en utilisant les températures quotidiennes minimums et maximums à une profondeur du sol de 10 cm et une approximation de l’onde demi-sinusoïdale, ou à partir des températures quotidiennes minimums et maximums de l’air à une hauteur de 1 m, en utilisant un modèle pour prédire les températures du sol à partir des températures de l’air. La différence moyenne entre nombre de jours prédit et nombre de jours aperçu pour l’éclosion à 50% des chrysomèles a été 0,22 jours quand la température du sol a été utilisée et de 0,00 jours pour la température de l’air. Les régressions linéaires entre dates Juliennes prédites et observées pour 10, 50 et 90% d’éclosions du sol cumulatives des chrysomèles ont signalés que les prédictions du modèle ont été raisonnablement justes et précises soit en utilisant les températures du sol, soit en utilisant les températures de l’air.

Type
Research Article
Information
The Canadian Entomologist , Volume 122 , Issue 6 , December 1990 , pp. 1079 - 1091
Copyright
Copyright © Entomological Society of Canada 1990

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Footnotes

1

Current address: USDA, ARS, SPA, Plant Science and Water Conservation Research Laboratory, 1301 N. Western Rd., Stillwater, Oklahoma, USA 74075.

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