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Assefa Gebre-Amlak
Colorado State University Extension
Greeley, CO 80631-2049
Phone: (970) 304-6535 Ext. 2074
Fax: (970) 351-0415
E-mail: Assefa.Gebre-Amlak@Colostate.Edu


 
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Degree Days

Degree Days

Alfalfa Weevil
Estimation of the weevil instars present in the field can be calculated using degree-days. Alfalfa weevil development increases at a nearly constant rate as the temperature rises above 48°F (9°C.). The amount of warm weather required for weevil larvae to complete development is measured in units of degree-days. View 2011 Alfalfa Weevil Degree Days.

Sunflower Stem Weevil

Sunflower stem weevil pupation, adult formation and emergence in the field can be predicted using accumulated degree-days. The stem weevil development increases at a nearly constant rate as the temperature rises above 41°F (5°C.). View 2010 Sunflower Stem Weevil Degree Days.

Degree Day Prediction Models for Sunflower Stem Weevil (Curculionidae: Coleoptera) Development and Adult Emergence PDF

 

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