Environmental Entomology (1983) 12, 482-486

Dennis R. Ring and Marvin K. Harris (1983)
Predicting pecan nut casebearer (Lepidoptera: Pyralidae) activity at College Station, Texas
Environmental Entomology 12 (2), 482-486
Abstract: A model to predict pupation, adult emergence, and oviposition of the overwintering generation, and hatch and nut entry by larvae of the first summer generation of pecan nut casebearer, Acrobasis nuxvorella Nuenzig, was developed from an existing data base reported by S. W. Bilsing. Degree-days were calculated, by starting accumulations on a range of days from 1 January to 30 April in 1-day increments, using a base temperature ranging from -17.2 to 21.1 °C in 0.56°C increments, using the formula of average daily temperature - base temperature from the start day to the observed event. Comparisons resulting from various start days and base temperatures were made by using the root mean square error of observed - predicted events in days. The final model used a start day of 12 March and a base temperature of 3.3°C, and predictions of biological events for pecan nut casebearer during 1979 through 1981 were superior to those based on the average calendar date for these events at College Station, Tex.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Marvin K. Harris

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Acrobasis nuxvorella		U.S.A. (mid S)