Abstract
Temperature is most often used to control the progress of a poinsettia (Euphorbia pulcherrima Willd.) crop after flower initiation, but lack of good temperature control can make crop timing difficult. Degree-day summations are used to monitor and predict developmental stages of many crops. The objective was to determine whether degree-days can be used to predict poinsettia crop development. Dates of occurrence of first bract color and anthesis were observed for `Gutbier V-14 Glory' and `Annette Hegg Dark Red' poinsettia plants for 3 years. Total degree-day accumulation was read from an electronic instrument each day dates were recorded. There was a high level of consistency in the degree-day values, suggesting that degree-day accumulations offer a means of monitoring crop progress and of calculating temperature regimes so that plants finish on time.
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