A Degree-Day Model Initiated by Pheromone Trap Captures for Managing Pecan Nut Casebearer (Lepidoptera: Pyralidae) in Pecans

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Field observations from pecan, Carya illinoinensis (Wangenh.) Koch, orchards in Texas were used to develop and validate a degree-day model of cumulative proportional adult flight and oviposition and date of first observed nut entry by larvae of the first summer generation of the pecan nut casebearer, Acrobasis nuxvorella Nuenzig (Lepidoptera: Pyralidae). The model was initiated on the date of first sustained capture of adults in pheromone traps. Mean daily maximum and minimum temperatures were used to determine the sum of degree-days from onset to 99% moth flight and oviposition and the date on which first summer generation larvae were first observed penetrating pecan nuts. Cumulative proportional oviposition (y) was described by a modified Gompertz equation, y = 106.05 × exp(−(exp(3.11 − 0.00669 × (x − 1)))), with x = cumulative degree-days at a base temperature of 3.33°C. Cumulative proportional moth flight (y) was modeled as y = 102.62 × exp(−(exp(1.49 − 0.00571 × (x − 1)))). Model prediction error for dates of 10, 25, 50, 75, and 90% cumulative oviposition was 1.3 d and 83% of the predicted dates were within ± 2 d of the observed event. Prediction error for date of first observed nut entry was 2.2 d and 77% of model predictions were within ±2 d of the observed event. The model provides ample lead time for producers to implement orchard scouting to assess pecan nut casebearer infestations and to apply an insecticide if needed to prevent economic loss.

Keywords: Acrobasis nuxvorella; Carya; biofix; heat unit; physiological model

Document Type: Research Article

DOI: http://dx.doi.org/10.1603/EC09319

Publication date: June 1, 2010

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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