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Title:   Author  item
                                            Steffan, Shawnitem
                                            DEUTSCH, ANNA - University Of Wisconsinitem
                                            RODRIGUEZ-SAONA, CESAR - Rutgers Universityitem
                                            Zalapa, Juanitem
                                            KYRYCZENKO-ROTH, VERZ - Rutgers University
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 8/22/2014
                                    Publication  Date: 8/22/2014
                                    Citation: Steffan, S.A., Deutsch, A., Rodriguez-Saona, C., Zalapa, J.E., Kyryczenko-Roth, V. 2014. A phenology model for Sparganothis fruitworm in Cranberries. American Cranberry Growers Association.Interpretive Summary:
                                Technical Abstract: Larvae of Sparganothis sulfureana Clemens, frequently attack cranberries, often resulting in economic damage to the crop. Because temperature dictates insect growth rate, development can be accurately estimated based on daily temperature measurements. To better predict S. sulfureana development across the growing season, we investigated the temperature range within which S. sulfureana larvae can feed and grow. Larvae were reared at 13 constant temperatures ranging from 6.5-38.6°C. Larval growth rate was determined by the rate of change of larval weight across time. The respective growth rates among these temperatures were modeled using a linear, cubic, and Lactin nonlinear development functions. These models isolated the lower temperature threshold at which growth became non-zero and the upper temperature at which growth was maximized. All three models were significantly predictive of S. sulfureana growth, but the cubic model best represented the observed growth rates, effectively isolating lower and upper thresholds of 9.97 and 29.89°C, respectively. We propose that these thresholds should be used to create a degree-day model of temperature-mediated S. sulfureana development.


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