Based on our degree-day model for Sparganothis fruitworm, flight initiation is expected at around 596 DD (see chart). As of June 3, Sparganothis has accumulated 648 DD (using March 1 as biofix) or 608 DD (using April 1 as biofix). This indicates that flight activity has just started. Growers are advised to place pheromone traps for monitoring this pest at this moment, if they haven’t done so already.
![](https://plant-pest-advisory.rutgers.edu/wp-content/uploads/2017/06/Sparg-adult-300x226.jpg)
Sparganothis fruitworm adult
![](https://plant-pest-advisory.rutgers.edu/wp-content/uploads/2017/06/DD-Sparg-300x225.jpg)
Degree-day model benchmarks for Sparganothis fruitworm