Research and IPM
Phenology Model Database
Sunflower Stem Weevil
Scientific name: Cylindrocopturus adspersus
Phenology models
predict timing of events in an organism's development.
For many organisms which cannot internally regulate their own temperature,
development is dependent on temperatures to which they are exposed in the environment.
Information in this database comes from published articles.
It may be used in conjunction with field monitoring and a
degree-day calculator.
Note: Before using a model that was not field tested in your location,
you should test the model
for one or more seasons under your conditions to verify
that it will work for you.
Model 1 of 1
Charlet, L. D. 1987. Emergence of the sunflower stem weevil,
Cylindrocopturus adspersus (Coleoptera: Curculionidae), relative to
calendar date and degree-days in the northern great plains. J. Kan.
Ent. Soc. 60:426-432.
Location of study: Fargo, North Dakota (field studies)
Developmental thresholds
| Lower: | 41.0°F | ( 5.0°C) |
| Upper: | 89.6°F | (32.0°C) |
| Method of calculation: | Double Sine |
|---|
| Cutoff method: | Horizontal Cutoff |
|---|
Degree-day accumulations required for each stage of development
Start date: January 1
| | DD (°F) | DD (°C) |
|---|
| Initial emergence | 756.0 | 420.0 |
|---|
| 10% emergence | 963.9 | 535.5 |
| 50% emergence | 1207.4 | 670.8 |
| 90% emergence | 1557.1 | 865.1 |
|
