title: Temperature-Mediated Development Thresholds of Sparganothis sulfureana (Lepidoptera: Tortricidae) in Cranberries.
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 simple linear, cubic, and Lactin nonlinear development functions. These models isolated the lower temperature threshold at which growth became nonzero 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 be used to create a degree-day model of temperature-mediated S. sulfureana development.
authors: Department of Entomology, University of Wisconsin, Madison, WI 53706.
authors: Annie E
authors: AE
authors: Deutsch
authors: Rutgers University, P.E. Marucci Center for Blueberry and Cranberry Research and Extension, 125A Lake Oswego Rd., Chatsworth, NJ 08019.
authors: Cesar R
authors: CR
authors: Rodriguez-Saona
authors: USDA-ARS Vegetable Crops Research Unit, Madison, WI 53706.
authors: Juan E
authors: JE
authors: Zalapa
authors: Department of Entomology, University of Wisconsin, Madison, WI 53706. USDA-ARS Vegetable Crops Research Unit, Madison, WI 53706. Corresponding author, e-mail: steffan@entomology.wisc.edu.
authors: Shawn A
authors: SA
authors: Steffan
mesh_terms: D000818:Animals; D007300:Insect Control; D007814:Larva / Q000254:growth & development; D008954:Models, Biological; D009036:Moths / Q000254:growth & development*; D013696:Temperature; D029799:Vaccinium macrocarpon / Q000254:growth & development
keywords: Sparganothis sulfureana; cranberry; degree-day; developmental model; pest management