Cranberry Degree-Day Map and Update
The maps below show degree day accumulations for cranberry plants and Sparganothis fruitworm across Wisconsin up through May 12, 2016. The weather data used for these degree day accumulations are retrieved from public weather stations and can vary from the degree-day accumulations specific to your marsh. Throughout WI, plant degree-days ranged from a low accumulation of 123 DD to a high of 666 DD, while Sparganothis degree-days ranged from a low of 50 DD to a high of 311 DD.
The table below allows for comparison of degree-days over the last three years. Plant stages at this level of DD accumulation are likely ranging from tight bud to cabbage head. Sparganothis flight does not begin until nearly 600 DD.
