Journal of Economic Entomology (2010) 103, 302-307

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Scott C. Merrill, Assefa Gebre-Amlak, J. Scott Armstrong and Frank B. Peairs (2010)
Nonlinear degree-day models for postdiapause development of the sunflower stem weevil (Coleoptera: Curculionidae)
Journal of Economic Entomology 103 (2), 302-307
Abstract: The sunflower stem weevil, Cylindrocopturus adspersus (LeConte) (Coleoptera: Curculionidae), has caused yield losses across much of the western Great Plains, Little is known about the field biology of this pest. Simple prediction models, such as degree-day models, are an integral tool for development of C. adspersus management strategies. Using data collected in Colorado, Kansas, and Nebraska, we sought for predictable variation between C. adspersus pupation, adult eclosion, and emergence and accumulated degree-days Celsius (DD) by using a temperature threshold of 5°C. Accurate phenological models can be used to time scouting efforts and pesticide applications. The relationship between phenological data and accumulated DD fit nonlinear, Gaussian distributions better than uniform distributions. Phenological models were developed to describe these distributions for pupation, adult presence within the stalk and adult emergence, The pupation model predicts 50% pupation at 197 DD and 90% at 307 DD. Model results predict that 50% of adult eclosion within the stalks will have transpired at 396 DD and 90% at 529 DD. A model-averaged result from two data sets predicts 5% adult emergence from stalks at 262 DD, 50% emergence at 540 DD, 75% emergence at 657 DD, and 90% at 777 DD. Scouting for adults thus can be initiated at 262 DD. Current chemical controls target adults to prevent oviposition. Thus, applications therefore should not be made before this point.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): J. Scott Armstrong, Frank B. Peairs

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
environment - cropping system/rotation

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Cylindrocopturus adspersus Sunflower (Helianthus annuus) U.S.A. (SW)
Cylindrocopturus adspersus Sunflower (Helianthus annuus) U.S.A. (mid N)
Cylindrocopturus adspersus Sunflower (Helianthus annuus) U.S.A. (mid S)