Cranberry girdler, Chrysoteuchia topiaria, was monitored with pheromone traps in Wisconsin cranberry farms. Cumulative 50% capture was related to degree-days after first catch using air or soil temperature. An air temperature of O°C and soil temperature of 2°C were chosen as base temperatures for calculation of degree-days because they yielded estimates with the lowest coefficients of variation. Weibull functions were fitted to the relation- ship between cumulative percent capture and time or degree-days after first trap catch using air or soil temperatures. The models that predicted the date of 50% capture were evaluated with data from two other farms. Degree-days after first catch using soil temperatures predicted 50% catch with less variability than calendar date or degree-days after thaw of ice. but not significantly less variability than days after first catch or degree-days after first catch using air temperatures.
Cockfield, Stephen D. and Mahr, Daniel L.
"Prediction Models for Flight Activity of the Cranberry Girdler (Lepidoptera: Pyralidae) in Wisconsin,"
The Great Lakes Entomologist, vol 27
Available at: https://scholar.valpo.edu/tgle/vol27/iss2/6